LCOV - code coverage report
Current view: top level - src/backend/executor - nodeModifyTable.c (source / functions) Hit Total Coverage
Test: PostgreSQL 18beta1 Lines: 1359 1479 91.9 %
Date: 2025-06-06 18:17:16 Functions: 38 39 97.4 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * nodeModifyTable.c
       4             :  *    routines to handle ModifyTable nodes.
       5             :  *
       6             :  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  *
      10             :  * IDENTIFICATION
      11             :  *    src/backend/executor/nodeModifyTable.c
      12             :  *
      13             :  *-------------------------------------------------------------------------
      14             :  */
      15             : /* INTERFACE ROUTINES
      16             :  *      ExecInitModifyTable - initialize the ModifyTable node
      17             :  *      ExecModifyTable     - retrieve the next tuple from the node
      18             :  *      ExecEndModifyTable  - shut down the ModifyTable node
      19             :  *      ExecReScanModifyTable - rescan the ModifyTable node
      20             :  *
      21             :  *   NOTES
      22             :  *      The ModifyTable node receives input from its outerPlan, which is
      23             :  *      the data to insert for INSERT cases, the changed columns' new
      24             :  *      values plus row-locating info for UPDATE and MERGE cases, or just the
      25             :  *      row-locating info for DELETE cases.
      26             :  *
      27             :  *      The relation to modify can be an ordinary table, a foreign table, or a
      28             :  *      view.  If it's a view, either it has sufficient INSTEAD OF triggers or
      29             :  *      this node executes only MERGE ... DO NOTHING.  If the original MERGE
      30             :  *      targeted a view not in one of those two categories, earlier processing
      31             :  *      already pointed the ModifyTable result relation to an underlying
      32             :  *      relation of that other view.  This node does process
      33             :  *      ri_WithCheckOptions, which may have expressions from those other,
      34             :  *      automatically updatable views.
      35             :  *
      36             :  *      MERGE runs a join between the source relation and the target table.
      37             :  *      If any WHEN NOT MATCHED [BY TARGET] clauses are present, then the join
      38             :  *      is an outer join that might output tuples without a matching target
      39             :  *      tuple.  In this case, any unmatched target tuples will have NULL
      40             :  *      row-locating info, and only INSERT can be run.  But for matched target
      41             :  *      tuples, the row-locating info is used to determine the tuple to UPDATE
      42             :  *      or DELETE.  When all clauses are WHEN MATCHED or WHEN NOT MATCHED BY
      43             :  *      SOURCE, all tuples produced by the join will include a matching target
      44             :  *      tuple, so all tuples contain row-locating info.
      45             :  *
      46             :  *      If the query specifies RETURNING, then the ModifyTable returns a
      47             :  *      RETURNING tuple after completing each row insert, update, or delete.
      48             :  *      It must be called again to continue the operation.  Without RETURNING,
      49             :  *      we just loop within the node until all the work is done, then
      50             :  *      return NULL.  This avoids useless call/return overhead.
      51             :  */
      52             : 
      53             : #include "postgres.h"
      54             : 
      55             : #include "access/htup_details.h"
      56             : #include "access/tableam.h"
      57             : #include "access/xact.h"
      58             : #include "commands/trigger.h"
      59             : #include "executor/execPartition.h"
      60             : #include "executor/executor.h"
      61             : #include "executor/nodeModifyTable.h"
      62             : #include "foreign/fdwapi.h"
      63             : #include "miscadmin.h"
      64             : #include "nodes/nodeFuncs.h"
      65             : #include "optimizer/optimizer.h"
      66             : #include "rewrite/rewriteHandler.h"
      67             : #include "rewrite/rewriteManip.h"
      68             : #include "storage/lmgr.h"
      69             : #include "utils/builtins.h"
      70             : #include "utils/datum.h"
      71             : #include "utils/rel.h"
      72             : #include "utils/snapmgr.h"
      73             : 
      74             : 
      75             : typedef struct MTTargetRelLookup
      76             : {
      77             :     Oid         relationOid;    /* hash key, must be first */
      78             :     int         relationIndex;  /* rel's index in resultRelInfo[] array */
      79             : } MTTargetRelLookup;
      80             : 
      81             : /*
      82             :  * Context struct for a ModifyTable operation, containing basic execution
      83             :  * state and some output variables populated by ExecUpdateAct() and
      84             :  * ExecDeleteAct() to report the result of their actions to callers.
      85             :  */
      86             : typedef struct ModifyTableContext
      87             : {
      88             :     /* Operation state */
      89             :     ModifyTableState *mtstate;
      90             :     EPQState   *epqstate;
      91             :     EState     *estate;
      92             : 
      93             :     /*
      94             :      * Slot containing tuple obtained from ModifyTable's subplan.  Used to
      95             :      * access "junk" columns that are not going to be stored.
      96             :      */
      97             :     TupleTableSlot *planSlot;
      98             : 
      99             :     /*
     100             :      * Information about the changes that were made concurrently to a tuple
     101             :      * being updated or deleted
     102             :      */
     103             :     TM_FailureData tmfd;
     104             : 
     105             :     /*
     106             :      * The tuple deleted when doing a cross-partition UPDATE with a RETURNING
     107             :      * clause that refers to OLD columns (converted to the root's tuple
     108             :      * descriptor).
     109             :      */
     110             :     TupleTableSlot *cpDeletedSlot;
     111             : 
     112             :     /*
     113             :      * The tuple projected by the INSERT's RETURNING clause, when doing a
     114             :      * cross-partition UPDATE
     115             :      */
     116             :     TupleTableSlot *cpUpdateReturningSlot;
     117             : } ModifyTableContext;
     118             : 
     119             : /*
     120             :  * Context struct containing output data specific to UPDATE operations.
     121             :  */
     122             : typedef struct UpdateContext
     123             : {
     124             :     bool        crossPartUpdate;    /* was it a cross-partition update? */
     125             :     TU_UpdateIndexes updateIndexes; /* Which index updates are required? */
     126             : 
     127             :     /*
     128             :      * Lock mode to acquire on the latest tuple version before performing
     129             :      * EvalPlanQual on it
     130             :      */
     131             :     LockTupleMode lockmode;
     132             : } UpdateContext;
     133             : 
     134             : 
     135             : static void ExecBatchInsert(ModifyTableState *mtstate,
     136             :                             ResultRelInfo *resultRelInfo,
     137             :                             TupleTableSlot **slots,
     138             :                             TupleTableSlot **planSlots,
     139             :                             int numSlots,
     140             :                             EState *estate,
     141             :                             bool canSetTag);
     142             : static void ExecPendingInserts(EState *estate);
     143             : static void ExecCrossPartitionUpdateForeignKey(ModifyTableContext *context,
     144             :                                                ResultRelInfo *sourcePartInfo,
     145             :                                                ResultRelInfo *destPartInfo,
     146             :                                                ItemPointer tupleid,
     147             :                                                TupleTableSlot *oldslot,
     148             :                                                TupleTableSlot *newslot);
     149             : static bool ExecOnConflictUpdate(ModifyTableContext *context,
     150             :                                  ResultRelInfo *resultRelInfo,
     151             :                                  ItemPointer conflictTid,
     152             :                                  TupleTableSlot *excludedSlot,
     153             :                                  bool canSetTag,
     154             :                                  TupleTableSlot **returning);
     155             : static TupleTableSlot *ExecPrepareTupleRouting(ModifyTableState *mtstate,
     156             :                                                EState *estate,
     157             :                                                PartitionTupleRouting *proute,
     158             :                                                ResultRelInfo *targetRelInfo,
     159             :                                                TupleTableSlot *slot,
     160             :                                                ResultRelInfo **partRelInfo);
     161             : 
     162             : static TupleTableSlot *ExecMerge(ModifyTableContext *context,
     163             :                                  ResultRelInfo *resultRelInfo,
     164             :                                  ItemPointer tupleid,
     165             :                                  HeapTuple oldtuple,
     166             :                                  bool canSetTag);
     167             : static void ExecInitMerge(ModifyTableState *mtstate, EState *estate);
     168             : static TupleTableSlot *ExecMergeMatched(ModifyTableContext *context,
     169             :                                         ResultRelInfo *resultRelInfo,
     170             :                                         ItemPointer tupleid,
     171             :                                         HeapTuple oldtuple,
     172             :                                         bool canSetTag,
     173             :                                         bool *matched);
     174             : static TupleTableSlot *ExecMergeNotMatched(ModifyTableContext *context,
     175             :                                            ResultRelInfo *resultRelInfo,
     176             :                                            bool canSetTag);
     177             : 
     178             : 
     179             : /*
     180             :  * Verify that the tuples to be produced by INSERT match the
     181             :  * target relation's rowtype
     182             :  *
     183             :  * We do this to guard against stale plans.  If plan invalidation is
     184             :  * functioning properly then we should never get a failure here, but better
     185             :  * safe than sorry.  Note that this is called after we have obtained lock
     186             :  * on the target rel, so the rowtype can't change underneath us.
     187             :  *
     188             :  * The plan output is represented by its targetlist, because that makes
     189             :  * handling the dropped-column case easier.
     190             :  *
     191             :  * We used to use this for UPDATE as well, but now the equivalent checks
     192             :  * are done in ExecBuildUpdateProjection.
     193             :  */
     194             : static void
     195       87026 : ExecCheckPlanOutput(Relation resultRel, List *targetList)
     196             : {
     197       87026 :     TupleDesc   resultDesc = RelationGetDescr(resultRel);
     198       87026 :     int         attno = 0;
     199             :     ListCell   *lc;
     200             : 
     201      267924 :     foreach(lc, targetList)
     202             :     {
     203      180898 :         TargetEntry *tle = (TargetEntry *) lfirst(lc);
     204             :         Form_pg_attribute attr;
     205             : 
     206             :         Assert(!tle->resjunk);   /* caller removed junk items already */
     207             : 
     208      180898 :         if (attno >= resultDesc->natts)
     209           0 :             ereport(ERROR,
     210             :                     (errcode(ERRCODE_DATATYPE_MISMATCH),
     211             :                      errmsg("table row type and query-specified row type do not match"),
     212             :                      errdetail("Query has too many columns.")));
     213      180898 :         attr = TupleDescAttr(resultDesc, attno);
     214      180898 :         attno++;
     215             : 
     216             :         /*
     217             :          * Special cases here should match planner's expand_insert_targetlist.
     218             :          */
     219      180898 :         if (attr->attisdropped)
     220             :         {
     221             :             /*
     222             :              * For a dropped column, we can't check atttypid (it's likely 0).
     223             :              * In any case the planner has most likely inserted an INT4 null.
     224             :              * What we insist on is just *some* NULL constant.
     225             :              */
     226         622 :             if (!IsA(tle->expr, Const) ||
     227         622 :                 !((Const *) tle->expr)->constisnull)
     228           0 :                 ereport(ERROR,
     229             :                         (errcode(ERRCODE_DATATYPE_MISMATCH),
     230             :                          errmsg("table row type and query-specified row type do not match"),
     231             :                          errdetail("Query provides a value for a dropped column at ordinal position %d.",
     232             :                                    attno)));
     233             :         }
     234      180276 :         else if (attr->attgenerated)
     235             :         {
     236             :             /*
     237             :              * For a generated column, the planner will have inserted a null
     238             :              * of the column's base type (to avoid possibly failing on domain
     239             :              * not-null constraints).  It doesn't seem worth insisting on that
     240             :              * exact type though, since a null value is type-independent.  As
     241             :              * above, just insist on *some* NULL constant.
     242             :              */
     243        1122 :             if (!IsA(tle->expr, Const) ||
     244        1122 :                 !((Const *) tle->expr)->constisnull)
     245           0 :                 ereport(ERROR,
     246             :                         (errcode(ERRCODE_DATATYPE_MISMATCH),
     247             :                          errmsg("table row type and query-specified row type do not match"),
     248             :                          errdetail("Query provides a value for a generated column at ordinal position %d.",
     249             :                                    attno)));
     250             :         }
     251             :         else
     252             :         {
     253             :             /* Normal case: demand type match */
     254      179154 :             if (exprType((Node *) tle->expr) != attr->atttypid)
     255           0 :                 ereport(ERROR,
     256             :                         (errcode(ERRCODE_DATATYPE_MISMATCH),
     257             :                          errmsg("table row type and query-specified row type do not match"),
     258             :                          errdetail("Table has type %s at ordinal position %d, but query expects %s.",
     259             :                                    format_type_be(attr->atttypid),
     260             :                                    attno,
     261             :                                    format_type_be(exprType((Node *) tle->expr)))));
     262             :         }
     263             :     }
     264       87026 :     if (attno != resultDesc->natts)
     265           0 :         ereport(ERROR,
     266             :                 (errcode(ERRCODE_DATATYPE_MISMATCH),
     267             :                  errmsg("table row type and query-specified row type do not match"),
     268             :                  errdetail("Query has too few columns.")));
     269       87026 : }
     270             : 
     271             : /*
     272             :  * ExecProcessReturning --- evaluate a RETURNING list
     273             :  *
     274             :  * context: context for the ModifyTable operation
     275             :  * resultRelInfo: current result rel
     276             :  * cmdType: operation/merge action performed (INSERT, UPDATE, or DELETE)
     277             :  * oldSlot: slot holding old tuple deleted or updated
     278             :  * newSlot: slot holding new tuple inserted or updated
     279             :  * planSlot: slot holding tuple returned by top subplan node
     280             :  *
     281             :  * Note: If oldSlot and newSlot are NULL, the FDW should have already provided
     282             :  * econtext's scan tuple and its old & new tuples are not needed (FDW direct-
     283             :  * modify is disabled if the RETURNING list refers to any OLD/NEW values).
     284             :  *
     285             :  * Returns a slot holding the result tuple
     286             :  */
     287             : static TupleTableSlot *
     288        8072 : ExecProcessReturning(ModifyTableContext *context,
     289             :                      ResultRelInfo *resultRelInfo,
     290             :                      CmdType cmdType,
     291             :                      TupleTableSlot *oldSlot,
     292             :                      TupleTableSlot *newSlot,
     293             :                      TupleTableSlot *planSlot)
     294             : {
     295        8072 :     EState     *estate = context->estate;
     296        8072 :     ProjectionInfo *projectReturning = resultRelInfo->ri_projectReturning;
     297        8072 :     ExprContext *econtext = projectReturning->pi_exprContext;
     298             : 
     299             :     /* Make tuple and any needed join variables available to ExecProject */
     300        8072 :     switch (cmdType)
     301             :     {
     302        6642 :         case CMD_INSERT:
     303             :         case CMD_UPDATE:
     304             :             /* return new tuple by default */
     305        6642 :             if (newSlot)
     306        6186 :                 econtext->ecxt_scantuple = newSlot;
     307        6642 :             break;
     308             : 
     309        1430 :         case CMD_DELETE:
     310             :             /* return old tuple by default */
     311        1430 :             if (oldSlot)
     312        1192 :                 econtext->ecxt_scantuple = oldSlot;
     313        1430 :             break;
     314             : 
     315           0 :         default:
     316           0 :             elog(ERROR, "unrecognized commandType: %d", (int) cmdType);
     317             :     }
     318        8072 :     econtext->ecxt_outertuple = planSlot;
     319             : 
     320             :     /* Make old/new tuples available to ExecProject, if required */
     321        8072 :     if (oldSlot)
     322        3818 :         econtext->ecxt_oldtuple = oldSlot;
     323        4254 :     else if (projectReturning->pi_state.flags & EEO_FLAG_HAS_OLD)
     324         180 :         econtext->ecxt_oldtuple = ExecGetAllNullSlot(estate, resultRelInfo);
     325             :     else
     326        4074 :         econtext->ecxt_oldtuple = NULL; /* No references to OLD columns */
     327             : 
     328        8072 :     if (newSlot)
     329        6186 :         econtext->ecxt_newtuple = newSlot;
     330        1886 :     else if (projectReturning->pi_state.flags & EEO_FLAG_HAS_NEW)
     331         132 :         econtext->ecxt_newtuple = ExecGetAllNullSlot(estate, resultRelInfo);
     332             :     else
     333        1754 :         econtext->ecxt_newtuple = NULL; /* No references to NEW columns */
     334             : 
     335             :     /*
     336             :      * Tell ExecProject whether or not the OLD/NEW rows actually exist.  This
     337             :      * information is required to evaluate ReturningExpr nodes and also in
     338             :      * ExecEvalSysVar() and ExecEvalWholeRowVar().
     339             :      */
     340        8072 :     if (oldSlot == NULL)
     341        4254 :         projectReturning->pi_state.flags |= EEO_FLAG_OLD_IS_NULL;
     342             :     else
     343        3818 :         projectReturning->pi_state.flags &= ~EEO_FLAG_OLD_IS_NULL;
     344             : 
     345        8072 :     if (newSlot == NULL)
     346        1886 :         projectReturning->pi_state.flags |= EEO_FLAG_NEW_IS_NULL;
     347             :     else
     348        6186 :         projectReturning->pi_state.flags &= ~EEO_FLAG_NEW_IS_NULL;
     349             : 
     350             :     /* Compute the RETURNING expressions */
     351        8072 :     return ExecProject(projectReturning);
     352             : }
     353             : 
     354             : /*
     355             :  * ExecCheckTupleVisible -- verify tuple is visible
     356             :  *
     357             :  * It would not be consistent with guarantees of the higher isolation levels to
     358             :  * proceed with avoiding insertion (taking speculative insertion's alternative
     359             :  * path) on the basis of another tuple that is not visible to MVCC snapshot.
     360             :  * Check for the need to raise a serialization failure, and do so as necessary.
     361             :  */
     362             : static void
     363        5246 : ExecCheckTupleVisible(EState *estate,
     364             :                       Relation rel,
     365             :                       TupleTableSlot *slot)
     366             : {
     367        5246 :     if (!IsolationUsesXactSnapshot())
     368        5182 :         return;
     369             : 
     370          64 :     if (!table_tuple_satisfies_snapshot(rel, slot, estate->es_snapshot))
     371             :     {
     372             :         Datum       xminDatum;
     373             :         TransactionId xmin;
     374             :         bool        isnull;
     375             : 
     376          40 :         xminDatum = slot_getsysattr(slot, MinTransactionIdAttributeNumber, &isnull);
     377             :         Assert(!isnull);
     378          40 :         xmin = DatumGetTransactionId(xminDatum);
     379             : 
     380             :         /*
     381             :          * We should not raise a serialization failure if the conflict is
     382             :          * against a tuple inserted by our own transaction, even if it's not
     383             :          * visible to our snapshot.  (This would happen, for example, if
     384             :          * conflicting keys are proposed for insertion in a single command.)
     385             :          */
     386          40 :         if (!TransactionIdIsCurrentTransactionId(xmin))
     387          20 :             ereport(ERROR,
     388             :                     (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
     389             :                      errmsg("could not serialize access due to concurrent update")));
     390             :     }
     391             : }
     392             : 
     393             : /*
     394             :  * ExecCheckTIDVisible -- convenience variant of ExecCheckTupleVisible()
     395             :  */
     396             : static void
     397         212 : ExecCheckTIDVisible(EState *estate,
     398             :                     ResultRelInfo *relinfo,
     399             :                     ItemPointer tid,
     400             :                     TupleTableSlot *tempSlot)
     401             : {
     402         212 :     Relation    rel = relinfo->ri_RelationDesc;
     403             : 
     404             :     /* Redundantly check isolation level */
     405         212 :     if (!IsolationUsesXactSnapshot())
     406         148 :         return;
     407             : 
     408          64 :     if (!table_tuple_fetch_row_version(rel, tid, SnapshotAny, tempSlot))
     409           0 :         elog(ERROR, "failed to fetch conflicting tuple for ON CONFLICT");
     410          64 :     ExecCheckTupleVisible(estate, rel, tempSlot);
     411          44 :     ExecClearTuple(tempSlot);
     412             : }
     413             : 
     414             : /*
     415             :  * Initialize generated columns handling for a tuple
     416             :  *
     417             :  * This fills the resultRelInfo's ri_GeneratedExprsI/ri_NumGeneratedNeededI or
     418             :  * ri_GeneratedExprsU/ri_NumGeneratedNeededU fields, depending on cmdtype.
     419             :  * This is used only for stored generated columns.
     420             :  *
     421             :  * If cmdType == CMD_UPDATE, the ri_extraUpdatedCols field is filled too.
     422             :  * This is used by both stored and virtual generated columns.
     423             :  *
     424             :  * Note: usually, a given query would need only one of ri_GeneratedExprsI and
     425             :  * ri_GeneratedExprsU per result rel; but MERGE can need both, and so can
     426             :  * cross-partition UPDATEs, since a partition might be the target of both
     427             :  * UPDATE and INSERT actions.
     428             :  */
     429             : void
     430       59258 : ExecInitGenerated(ResultRelInfo *resultRelInfo,
     431             :                   EState *estate,
     432             :                   CmdType cmdtype)
     433             : {
     434       59258 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     435       59258 :     TupleDesc   tupdesc = RelationGetDescr(rel);
     436       59258 :     int         natts = tupdesc->natts;
     437             :     ExprState **ri_GeneratedExprs;
     438             :     int         ri_NumGeneratedNeeded;
     439             :     Bitmapset  *updatedCols;
     440             :     MemoryContext oldContext;
     441             : 
     442             :     /* Nothing to do if no generated columns */
     443       59258 :     if (!(tupdesc->constr && (tupdesc->constr->has_generated_stored || tupdesc->constr->has_generated_virtual)))
     444       58182 :         return;
     445             : 
     446             :     /*
     447             :      * In an UPDATE, we can skip computing any generated columns that do not
     448             :      * depend on any UPDATE target column.  But if there is a BEFORE ROW
     449             :      * UPDATE trigger, we cannot skip because the trigger might change more
     450             :      * columns.
     451             :      */
     452        1076 :     if (cmdtype == CMD_UPDATE &&
     453         250 :         !(rel->trigdesc && rel->trigdesc->trig_update_before_row))
     454         206 :         updatedCols = ExecGetUpdatedCols(resultRelInfo, estate);
     455             :     else
     456         870 :         updatedCols = NULL;
     457             : 
     458             :     /*
     459             :      * Make sure these data structures are built in the per-query memory
     460             :      * context so they'll survive throughout the query.
     461             :      */
     462        1076 :     oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
     463             : 
     464        1076 :     ri_GeneratedExprs = (ExprState **) palloc0(natts * sizeof(ExprState *));
     465        1076 :     ri_NumGeneratedNeeded = 0;
     466             : 
     467        4140 :     for (int i = 0; i < natts; i++)
     468             :     {
     469        3070 :         char        attgenerated = TupleDescAttr(tupdesc, i)->attgenerated;
     470             : 
     471        3070 :         if (attgenerated)
     472             :         {
     473             :             Expr       *expr;
     474             : 
     475             :             /* Fetch the GENERATED AS expression tree */
     476        1166 :             expr = (Expr *) build_column_default(rel, i + 1);
     477        1166 :             if (expr == NULL)
     478           0 :                 elog(ERROR, "no generation expression found for column number %d of table \"%s\"",
     479             :                      i + 1, RelationGetRelationName(rel));
     480             : 
     481             :             /*
     482             :              * If it's an update with a known set of update target columns,
     483             :              * see if we can skip the computation.
     484             :              */
     485        1166 :             if (updatedCols)
     486             :             {
     487         220 :                 Bitmapset  *attrs_used = NULL;
     488             : 
     489         220 :                 pull_varattnos((Node *) expr, 1, &attrs_used);
     490             : 
     491         220 :                 if (!bms_overlap(updatedCols, attrs_used))
     492          24 :                     continue;   /* need not update this column */
     493             :             }
     494             : 
     495             :             /* No luck, so prepare the expression for execution */
     496        1142 :             if (attgenerated == ATTRIBUTE_GENERATED_STORED)
     497             :             {
     498        1058 :                 ri_GeneratedExprs[i] = ExecPrepareExpr(expr, estate);
     499        1052 :                 ri_NumGeneratedNeeded++;
     500             :             }
     501             : 
     502             :             /* If UPDATE, mark column in resultRelInfo->ri_extraUpdatedCols */
     503        1136 :             if (cmdtype == CMD_UPDATE)
     504         248 :                 resultRelInfo->ri_extraUpdatedCols =
     505         248 :                     bms_add_member(resultRelInfo->ri_extraUpdatedCols,
     506             :                                    i + 1 - FirstLowInvalidHeapAttributeNumber);
     507             :         }
     508             :     }
     509             : 
     510        1070 :     if (ri_NumGeneratedNeeded == 0)
     511             :     {
     512             :         /* didn't need it after all */
     513          42 :         pfree(ri_GeneratedExprs);
     514          42 :         ri_GeneratedExprs = NULL;
     515             :     }
     516             : 
     517             :     /* Save in appropriate set of fields */
     518        1070 :     if (cmdtype == CMD_UPDATE)
     519             :     {
     520             :         /* Don't call twice */
     521             :         Assert(resultRelInfo->ri_GeneratedExprsU == NULL);
     522             : 
     523         250 :         resultRelInfo->ri_GeneratedExprsU = ri_GeneratedExprs;
     524         250 :         resultRelInfo->ri_NumGeneratedNeededU = ri_NumGeneratedNeeded;
     525             : 
     526         250 :         resultRelInfo->ri_extraUpdatedCols_valid = true;
     527             :     }
     528             :     else
     529             :     {
     530             :         /* Don't call twice */
     531             :         Assert(resultRelInfo->ri_GeneratedExprsI == NULL);
     532             : 
     533         820 :         resultRelInfo->ri_GeneratedExprsI = ri_GeneratedExprs;
     534         820 :         resultRelInfo->ri_NumGeneratedNeededI = ri_NumGeneratedNeeded;
     535             :     }
     536             : 
     537        1070 :     MemoryContextSwitchTo(oldContext);
     538             : }
     539             : 
     540             : /*
     541             :  * Compute stored generated columns for a tuple
     542             :  */
     543             : void
     544        1458 : ExecComputeStoredGenerated(ResultRelInfo *resultRelInfo,
     545             :                            EState *estate, TupleTableSlot *slot,
     546             :                            CmdType cmdtype)
     547             : {
     548        1458 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     549        1458 :     TupleDesc   tupdesc = RelationGetDescr(rel);
     550        1458 :     int         natts = tupdesc->natts;
     551        1458 :     ExprContext *econtext = GetPerTupleExprContext(estate);
     552             :     ExprState **ri_GeneratedExprs;
     553             :     MemoryContext oldContext;
     554             :     Datum      *values;
     555             :     bool       *nulls;
     556             : 
     557             :     /* We should not be called unless this is true */
     558             :     Assert(tupdesc->constr && tupdesc->constr->has_generated_stored);
     559             : 
     560             :     /*
     561             :      * Initialize the expressions if we didn't already, and check whether we
     562             :      * can exit early because nothing needs to be computed.
     563             :      */
     564        1458 :     if (cmdtype == CMD_UPDATE)
     565             :     {
     566         262 :         if (resultRelInfo->ri_GeneratedExprsU == NULL)
     567         200 :             ExecInitGenerated(resultRelInfo, estate, cmdtype);
     568         262 :         if (resultRelInfo->ri_NumGeneratedNeededU == 0)
     569          18 :             return;
     570         244 :         ri_GeneratedExprs = resultRelInfo->ri_GeneratedExprsU;
     571             :     }
     572             :     else
     573             :     {
     574        1196 :         if (resultRelInfo->ri_GeneratedExprsI == NULL)
     575         826 :             ExecInitGenerated(resultRelInfo, estate, cmdtype);
     576             :         /* Early exit is impossible given the prior Assert */
     577             :         Assert(resultRelInfo->ri_NumGeneratedNeededI > 0);
     578        1190 :         ri_GeneratedExprs = resultRelInfo->ri_GeneratedExprsI;
     579             :     }
     580             : 
     581        1434 :     oldContext = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
     582             : 
     583        1434 :     values = palloc(sizeof(*values) * natts);
     584        1434 :     nulls = palloc(sizeof(*nulls) * natts);
     585             : 
     586        1434 :     slot_getallattrs(slot);
     587        1434 :     memcpy(nulls, slot->tts_isnull, sizeof(*nulls) * natts);
     588             : 
     589        5364 :     for (int i = 0; i < natts; i++)
     590             :     {
     591        3954 :         CompactAttribute *attr = TupleDescCompactAttr(tupdesc, i);
     592             : 
     593        3954 :         if (ri_GeneratedExprs[i])
     594             :         {
     595             :             Datum       val;
     596             :             bool        isnull;
     597             : 
     598             :             Assert(TupleDescAttr(tupdesc, i)->attgenerated == ATTRIBUTE_GENERATED_STORED);
     599             : 
     600        1468 :             econtext->ecxt_scantuple = slot;
     601             : 
     602        1468 :             val = ExecEvalExpr(ri_GeneratedExprs[i], econtext, &isnull);
     603             : 
     604             :             /*
     605             :              * We must make a copy of val as we have no guarantees about where
     606             :              * memory for a pass-by-reference Datum is located.
     607             :              */
     608        1444 :             if (!isnull)
     609        1390 :                 val = datumCopy(val, attr->attbyval, attr->attlen);
     610             : 
     611        1444 :             values[i] = val;
     612        1444 :             nulls[i] = isnull;
     613             :         }
     614             :         else
     615             :         {
     616        2486 :             if (!nulls[i])
     617        2336 :                 values[i] = datumCopy(slot->tts_values[i], attr->attbyval, attr->attlen);
     618             :         }
     619             :     }
     620             : 
     621        1410 :     ExecClearTuple(slot);
     622        1410 :     memcpy(slot->tts_values, values, sizeof(*values) * natts);
     623        1410 :     memcpy(slot->tts_isnull, nulls, sizeof(*nulls) * natts);
     624        1410 :     ExecStoreVirtualTuple(slot);
     625        1410 :     ExecMaterializeSlot(slot);
     626             : 
     627        1410 :     MemoryContextSwitchTo(oldContext);
     628             : }
     629             : 
     630             : /*
     631             :  * ExecInitInsertProjection
     632             :  *      Do one-time initialization of projection data for INSERT tuples.
     633             :  *
     634             :  * INSERT queries may need a projection to filter out junk attrs in the tlist.
     635             :  *
     636             :  * This is also a convenient place to verify that the
     637             :  * output of an INSERT matches the target table.
     638             :  */
     639             : static void
     640       85980 : ExecInitInsertProjection(ModifyTableState *mtstate,
     641             :                          ResultRelInfo *resultRelInfo)
     642             : {
     643       85980 :     ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
     644       85980 :     Plan       *subplan = outerPlan(node);
     645       85980 :     EState     *estate = mtstate->ps.state;
     646       85980 :     List       *insertTargetList = NIL;
     647       85980 :     bool        need_projection = false;
     648             :     ListCell   *l;
     649             : 
     650             :     /* Extract non-junk columns of the subplan's result tlist. */
     651      264152 :     foreach(l, subplan->targetlist)
     652             :     {
     653      178172 :         TargetEntry *tle = (TargetEntry *) lfirst(l);
     654             : 
     655      178172 :         if (!tle->resjunk)
     656      178172 :             insertTargetList = lappend(insertTargetList, tle);
     657             :         else
     658           0 :             need_projection = true;
     659             :     }
     660             : 
     661             :     /*
     662             :      * The junk-free list must produce a tuple suitable for the result
     663             :      * relation.
     664             :      */
     665       85980 :     ExecCheckPlanOutput(resultRelInfo->ri_RelationDesc, insertTargetList);
     666             : 
     667             :     /* We'll need a slot matching the table's format. */
     668       85980 :     resultRelInfo->ri_newTupleSlot =
     669       85980 :         table_slot_create(resultRelInfo->ri_RelationDesc,
     670             :                           &estate->es_tupleTable);
     671             : 
     672             :     /* Build ProjectionInfo if needed (it probably isn't). */
     673       85980 :     if (need_projection)
     674             :     {
     675           0 :         TupleDesc   relDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
     676             : 
     677             :         /* need an expression context to do the projection */
     678           0 :         if (mtstate->ps.ps_ExprContext == NULL)
     679           0 :             ExecAssignExprContext(estate, &mtstate->ps);
     680             : 
     681           0 :         resultRelInfo->ri_projectNew =
     682           0 :             ExecBuildProjectionInfo(insertTargetList,
     683             :                                     mtstate->ps.ps_ExprContext,
     684             :                                     resultRelInfo->ri_newTupleSlot,
     685             :                                     &mtstate->ps,
     686             :                                     relDesc);
     687             :     }
     688             : 
     689       85980 :     resultRelInfo->ri_projectNewInfoValid = true;
     690       85980 : }
     691             : 
     692             : /*
     693             :  * ExecInitUpdateProjection
     694             :  *      Do one-time initialization of projection data for UPDATE tuples.
     695             :  *
     696             :  * UPDATE always needs a projection, because (1) there's always some junk
     697             :  * attrs, and (2) we may need to merge values of not-updated columns from
     698             :  * the old tuple into the final tuple.  In UPDATE, the tuple arriving from
     699             :  * the subplan contains only new values for the changed columns, plus row
     700             :  * identity info in the junk attrs.
     701             :  *
     702             :  * This is "one-time" for any given result rel, but we might touch more than
     703             :  * one result rel in the course of an inherited UPDATE, and each one needs
     704             :  * its own projection due to possible column order variation.
     705             :  *
     706             :  * This is also a convenient place to verify that the output of an UPDATE
     707             :  * matches the target table (ExecBuildUpdateProjection does that).
     708             :  */
     709             : static void
     710       13184 : ExecInitUpdateProjection(ModifyTableState *mtstate,
     711             :                          ResultRelInfo *resultRelInfo)
     712             : {
     713       13184 :     ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
     714       13184 :     Plan       *subplan = outerPlan(node);
     715       13184 :     EState     *estate = mtstate->ps.state;
     716       13184 :     TupleDesc   relDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
     717             :     int         whichrel;
     718             :     List       *updateColnos;
     719             : 
     720             :     /*
     721             :      * Usually, mt_lastResultIndex matches the target rel.  If it happens not
     722             :      * to, we can get the index the hard way with an integer division.
     723             :      */
     724       13184 :     whichrel = mtstate->mt_lastResultIndex;
     725       13184 :     if (resultRelInfo != mtstate->resultRelInfo + whichrel)
     726             :     {
     727           0 :         whichrel = resultRelInfo - mtstate->resultRelInfo;
     728             :         Assert(whichrel >= 0 && whichrel < mtstate->mt_nrels);
     729             :     }
     730             : 
     731       13184 :     updateColnos = (List *) list_nth(mtstate->mt_updateColnosLists, whichrel);
     732             : 
     733             :     /*
     734             :      * For UPDATE, we use the old tuple to fill up missing values in the tuple
     735             :      * produced by the subplan to get the new tuple.  We need two slots, both
     736             :      * matching the table's desired format.
     737             :      */
     738       13184 :     resultRelInfo->ri_oldTupleSlot =
     739       13184 :         table_slot_create(resultRelInfo->ri_RelationDesc,
     740             :                           &estate->es_tupleTable);
     741       13184 :     resultRelInfo->ri_newTupleSlot =
     742       13184 :         table_slot_create(resultRelInfo->ri_RelationDesc,
     743             :                           &estate->es_tupleTable);
     744             : 
     745             :     /* need an expression context to do the projection */
     746       13184 :     if (mtstate->ps.ps_ExprContext == NULL)
     747       11790 :         ExecAssignExprContext(estate, &mtstate->ps);
     748             : 
     749       13184 :     resultRelInfo->ri_projectNew =
     750       13184 :         ExecBuildUpdateProjection(subplan->targetlist,
     751             :                                   false,    /* subplan did the evaluation */
     752             :                                   updateColnos,
     753             :                                   relDesc,
     754             :                                   mtstate->ps.ps_ExprContext,
     755             :                                   resultRelInfo->ri_newTupleSlot,
     756             :                                   &mtstate->ps);
     757             : 
     758       13184 :     resultRelInfo->ri_projectNewInfoValid = true;
     759       13184 : }
     760             : 
     761             : /*
     762             :  * ExecGetInsertNewTuple
     763             :  *      This prepares a "new" tuple ready to be inserted into given result
     764             :  *      relation, by removing any junk columns of the plan's output tuple
     765             :  *      and (if necessary) coercing the tuple to the right tuple format.
     766             :  */
     767             : static TupleTableSlot *
     768    12156340 : ExecGetInsertNewTuple(ResultRelInfo *relinfo,
     769             :                       TupleTableSlot *planSlot)
     770             : {
     771    12156340 :     ProjectionInfo *newProj = relinfo->ri_projectNew;
     772             :     ExprContext *econtext;
     773             : 
     774             :     /*
     775             :      * If there's no projection to be done, just make sure the slot is of the
     776             :      * right type for the target rel.  If the planSlot is the right type we
     777             :      * can use it as-is, else copy the data into ri_newTupleSlot.
     778             :      */
     779    12156340 :     if (newProj == NULL)
     780             :     {
     781    12156340 :         if (relinfo->ri_newTupleSlot->tts_ops != planSlot->tts_ops)
     782             :         {
     783    11381244 :             ExecCopySlot(relinfo->ri_newTupleSlot, planSlot);
     784    11381244 :             return relinfo->ri_newTupleSlot;
     785             :         }
     786             :         else
     787      775096 :             return planSlot;
     788             :     }
     789             : 
     790             :     /*
     791             :      * Else project; since the projection output slot is ri_newTupleSlot, this
     792             :      * will also fix any slot-type problem.
     793             :      *
     794             :      * Note: currently, this is dead code, because INSERT cases don't receive
     795             :      * any junk columns so there's never a projection to be done.
     796             :      */
     797           0 :     econtext = newProj->pi_exprContext;
     798           0 :     econtext->ecxt_outertuple = planSlot;
     799           0 :     return ExecProject(newProj);
     800             : }
     801             : 
     802             : /*
     803             :  * ExecGetUpdateNewTuple
     804             :  *      This prepares a "new" tuple by combining an UPDATE subplan's output
     805             :  *      tuple (which contains values of changed columns) with unchanged
     806             :  *      columns taken from the old tuple.
     807             :  *
     808             :  * The subplan tuple might also contain junk columns, which are ignored.
     809             :  * Note that the projection also ensures we have a slot of the right type.
     810             :  */
     811             : TupleTableSlot *
     812      317290 : ExecGetUpdateNewTuple(ResultRelInfo *relinfo,
     813             :                       TupleTableSlot *planSlot,
     814             :                       TupleTableSlot *oldSlot)
     815             : {
     816      317290 :     ProjectionInfo *newProj = relinfo->ri_projectNew;
     817             :     ExprContext *econtext;
     818             : 
     819             :     /* Use a few extra Asserts to protect against outside callers */
     820             :     Assert(relinfo->ri_projectNewInfoValid);
     821             :     Assert(planSlot != NULL && !TTS_EMPTY(planSlot));
     822             :     Assert(oldSlot != NULL && !TTS_EMPTY(oldSlot));
     823             : 
     824      317290 :     econtext = newProj->pi_exprContext;
     825      317290 :     econtext->ecxt_outertuple = planSlot;
     826      317290 :     econtext->ecxt_scantuple = oldSlot;
     827      317290 :     return ExecProject(newProj);
     828             : }
     829             : 
     830             : /* ----------------------------------------------------------------
     831             :  *      ExecInsert
     832             :  *
     833             :  *      For INSERT, we have to insert the tuple into the target relation
     834             :  *      (or partition thereof) and insert appropriate tuples into the index
     835             :  *      relations.
     836             :  *
     837             :  *      slot contains the new tuple value to be stored.
     838             :  *
     839             :  *      Returns RETURNING result if any, otherwise NULL.
     840             :  *      *inserted_tuple is the tuple that's effectively inserted;
     841             :  *      *insert_destrel is the relation where it was inserted.
     842             :  *      These are only set on success.
     843             :  *
     844             :  *      This may change the currently active tuple conversion map in
     845             :  *      mtstate->mt_transition_capture, so the callers must take care to
     846             :  *      save the previous value to avoid losing track of it.
     847             :  * ----------------------------------------------------------------
     848             :  */
     849             : static TupleTableSlot *
     850    12159122 : ExecInsert(ModifyTableContext *context,
     851             :            ResultRelInfo *resultRelInfo,
     852             :            TupleTableSlot *slot,
     853             :            bool canSetTag,
     854             :            TupleTableSlot **inserted_tuple,
     855             :            ResultRelInfo **insert_destrel)
     856             : {
     857    12159122 :     ModifyTableState *mtstate = context->mtstate;
     858    12159122 :     EState     *estate = context->estate;
     859             :     Relation    resultRelationDesc;
     860    12159122 :     List       *recheckIndexes = NIL;
     861    12159122 :     TupleTableSlot *planSlot = context->planSlot;
     862    12159122 :     TupleTableSlot *result = NULL;
     863             :     TransitionCaptureState *ar_insert_trig_tcs;
     864    12159122 :     ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
     865    12159122 :     OnConflictAction onconflict = node->onConflictAction;
     866    12159122 :     PartitionTupleRouting *proute = mtstate->mt_partition_tuple_routing;
     867             :     MemoryContext oldContext;
     868             : 
     869             :     /*
     870             :      * If the input result relation is a partitioned table, find the leaf
     871             :      * partition to insert the tuple into.
     872             :      */
     873    12159122 :     if (proute)
     874             :     {
     875             :         ResultRelInfo *partRelInfo;
     876             : 
     877      726332 :         slot = ExecPrepareTupleRouting(mtstate, estate, proute,
     878             :                                        resultRelInfo, slot,
     879             :                                        &partRelInfo);
     880      726128 :         resultRelInfo = partRelInfo;
     881             :     }
     882             : 
     883    12158918 :     ExecMaterializeSlot(slot);
     884             : 
     885    12158918 :     resultRelationDesc = resultRelInfo->ri_RelationDesc;
     886             : 
     887             :     /*
     888             :      * Open the table's indexes, if we have not done so already, so that we
     889             :      * can add new index entries for the inserted tuple.
     890             :      */
     891    12158918 :     if (resultRelationDesc->rd_rel->relhasindex &&
     892     3099306 :         resultRelInfo->ri_IndexRelationDescs == NULL)
     893       31870 :         ExecOpenIndices(resultRelInfo, onconflict != ONCONFLICT_NONE);
     894             : 
     895             :     /*
     896             :      * BEFORE ROW INSERT Triggers.
     897             :      *
     898             :      * Note: We fire BEFORE ROW TRIGGERS for every attempted insertion in an
     899             :      * INSERT ... ON CONFLICT statement.  We cannot check for constraint
     900             :      * violations before firing these triggers, because they can change the
     901             :      * values to insert.  Also, they can run arbitrary user-defined code with
     902             :      * side-effects that we can't cancel by just not inserting the tuple.
     903             :      */
     904    12158918 :     if (resultRelInfo->ri_TrigDesc &&
     905       75172 :         resultRelInfo->ri_TrigDesc->trig_insert_before_row)
     906             :     {
     907             :         /* Flush any pending inserts, so rows are visible to the triggers */
     908        2054 :         if (estate->es_insert_pending_result_relations != NIL)
     909           6 :             ExecPendingInserts(estate);
     910             : 
     911        2054 :         if (!ExecBRInsertTriggers(estate, resultRelInfo, slot))
     912         200 :             return NULL;        /* "do nothing" */
     913             :     }
     914             : 
     915             :     /* INSTEAD OF ROW INSERT Triggers */
     916    12158620 :     if (resultRelInfo->ri_TrigDesc &&
     917       74874 :         resultRelInfo->ri_TrigDesc->trig_insert_instead_row)
     918             :     {
     919         168 :         if (!ExecIRInsertTriggers(estate, resultRelInfo, slot))
     920           6 :             return NULL;        /* "do nothing" */
     921             :     }
     922    12158452 :     else if (resultRelInfo->ri_FdwRoutine)
     923             :     {
     924             :         /*
     925             :          * GENERATED expressions might reference the tableoid column, so
     926             :          * (re-)initialize tts_tableOid before evaluating them.
     927             :          */
     928        2014 :         slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
     929             : 
     930             :         /*
     931             :          * Compute stored generated columns
     932             :          */
     933        2014 :         if (resultRelationDesc->rd_att->constr &&
     934         366 :             resultRelationDesc->rd_att->constr->has_generated_stored)
     935           8 :             ExecComputeStoredGenerated(resultRelInfo, estate, slot,
     936             :                                        CMD_INSERT);
     937             : 
     938             :         /*
     939             :          * If the FDW supports batching, and batching is requested, accumulate
     940             :          * rows and insert them in batches. Otherwise use the per-row inserts.
     941             :          */
     942        2014 :         if (resultRelInfo->ri_BatchSize > 1)
     943             :         {
     944         288 :             bool        flushed = false;
     945             : 
     946             :             /*
     947             :              * When we've reached the desired batch size, perform the
     948             :              * insertion.
     949             :              */
     950         288 :             if (resultRelInfo->ri_NumSlots == resultRelInfo->ri_BatchSize)
     951             :             {
     952          20 :                 ExecBatchInsert(mtstate, resultRelInfo,
     953             :                                 resultRelInfo->ri_Slots,
     954             :                                 resultRelInfo->ri_PlanSlots,
     955             :                                 resultRelInfo->ri_NumSlots,
     956             :                                 estate, canSetTag);
     957          20 :                 flushed = true;
     958             :             }
     959             : 
     960         288 :             oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
     961             : 
     962         288 :             if (resultRelInfo->ri_Slots == NULL)
     963             :             {
     964          56 :                 resultRelInfo->ri_Slots = palloc(sizeof(TupleTableSlot *) *
     965          28 :                                                  resultRelInfo->ri_BatchSize);
     966          28 :                 resultRelInfo->ri_PlanSlots = palloc(sizeof(TupleTableSlot *) *
     967          28 :                                                      resultRelInfo->ri_BatchSize);
     968             :             }
     969             : 
     970             :             /*
     971             :              * Initialize the batch slots. We don't know how many slots will
     972             :              * be needed, so we initialize them as the batch grows, and we
     973             :              * keep them across batches. To mitigate an inefficiency in how
     974             :              * resource owner handles objects with many references (as with
     975             :              * many slots all referencing the same tuple descriptor) we copy
     976             :              * the appropriate tuple descriptor for each slot.
     977             :              */
     978         288 :             if (resultRelInfo->ri_NumSlots >= resultRelInfo->ri_NumSlotsInitialized)
     979             :             {
     980         142 :                 TupleDesc   tdesc = CreateTupleDescCopy(slot->tts_tupleDescriptor);
     981             :                 TupleDesc   plan_tdesc =
     982         142 :                     CreateTupleDescCopy(planSlot->tts_tupleDescriptor);
     983             : 
     984         284 :                 resultRelInfo->ri_Slots[resultRelInfo->ri_NumSlots] =
     985         142 :                     MakeSingleTupleTableSlot(tdesc, slot->tts_ops);
     986             : 
     987         284 :                 resultRelInfo->ri_PlanSlots[resultRelInfo->ri_NumSlots] =
     988         142 :                     MakeSingleTupleTableSlot(plan_tdesc, planSlot->tts_ops);
     989             : 
     990             :                 /* remember how many batch slots we initialized */
     991         142 :                 resultRelInfo->ri_NumSlotsInitialized++;
     992             :             }
     993             : 
     994         288 :             ExecCopySlot(resultRelInfo->ri_Slots[resultRelInfo->ri_NumSlots],
     995             :                          slot);
     996             : 
     997         288 :             ExecCopySlot(resultRelInfo->ri_PlanSlots[resultRelInfo->ri_NumSlots],
     998             :                          planSlot);
     999             : 
    1000             :             /*
    1001             :              * If these are the first tuples stored in the buffers, add the
    1002             :              * target rel and the mtstate to the
    1003             :              * es_insert_pending_result_relations and
    1004             :              * es_insert_pending_modifytables lists respectively, except in
    1005             :              * the case where flushing was done above, in which case they
    1006             :              * would already have been added to the lists, so no need to do
    1007             :              * this.
    1008             :              */
    1009         288 :             if (resultRelInfo->ri_NumSlots == 0 && !flushed)
    1010             :             {
    1011             :                 Assert(!list_member_ptr(estate->es_insert_pending_result_relations,
    1012             :                                         resultRelInfo));
    1013          36 :                 estate->es_insert_pending_result_relations =
    1014          36 :                     lappend(estate->es_insert_pending_result_relations,
    1015             :                             resultRelInfo);
    1016          36 :                 estate->es_insert_pending_modifytables =
    1017          36 :                     lappend(estate->es_insert_pending_modifytables, mtstate);
    1018             :             }
    1019             :             Assert(list_member_ptr(estate->es_insert_pending_result_relations,
    1020             :                                    resultRelInfo));
    1021             : 
    1022         288 :             resultRelInfo->ri_NumSlots++;
    1023             : 
    1024         288 :             MemoryContextSwitchTo(oldContext);
    1025             : 
    1026         288 :             return NULL;
    1027             :         }
    1028             : 
    1029             :         /*
    1030             :          * insert into foreign table: let the FDW do it
    1031             :          */
    1032        1726 :         slot = resultRelInfo->ri_FdwRoutine->ExecForeignInsert(estate,
    1033             :                                                                resultRelInfo,
    1034             :                                                                slot,
    1035             :                                                                planSlot);
    1036             : 
    1037        1720 :         if (slot == NULL)       /* "do nothing" */
    1038           4 :             return NULL;
    1039             : 
    1040             :         /*
    1041             :          * AFTER ROW Triggers or RETURNING expressions might reference the
    1042             :          * tableoid column, so (re-)initialize tts_tableOid before evaluating
    1043             :          * them.  (This covers the case where the FDW replaced the slot.)
    1044             :          */
    1045        1716 :         slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
    1046             :     }
    1047             :     else
    1048             :     {
    1049             :         WCOKind     wco_kind;
    1050             : 
    1051             :         /*
    1052             :          * Constraints and GENERATED expressions might reference the tableoid
    1053             :          * column, so (re-)initialize tts_tableOid before evaluating them.
    1054             :          */
    1055    12156438 :         slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    1056             : 
    1057             :         /*
    1058             :          * Compute stored generated columns
    1059             :          */
    1060    12156438 :         if (resultRelationDesc->rd_att->constr &&
    1061     3713094 :             resultRelationDesc->rd_att->constr->has_generated_stored)
    1062        1058 :             ExecComputeStoredGenerated(resultRelInfo, estate, slot,
    1063             :                                        CMD_INSERT);
    1064             : 
    1065             :         /*
    1066             :          * Check any RLS WITH CHECK policies.
    1067             :          *
    1068             :          * Normally we should check INSERT policies. But if the insert is the
    1069             :          * result of a partition key update that moved the tuple to a new
    1070             :          * partition, we should instead check UPDATE policies, because we are
    1071             :          * executing policies defined on the target table, and not those
    1072             :          * defined on the child partitions.
    1073             :          *
    1074             :          * If we're running MERGE, we refer to the action that we're executing
    1075             :          * to know if we're doing an INSERT or UPDATE to a partition table.
    1076             :          */
    1077    12156408 :         if (mtstate->operation == CMD_UPDATE)
    1078         782 :             wco_kind = WCO_RLS_UPDATE_CHECK;
    1079    12155626 :         else if (mtstate->operation == CMD_MERGE)
    1080        1760 :             wco_kind = (mtstate->mt_merge_action->mas_action->commandType == CMD_UPDATE) ?
    1081        1760 :                 WCO_RLS_UPDATE_CHECK : WCO_RLS_INSERT_CHECK;
    1082             :         else
    1083    12153866 :             wco_kind = WCO_RLS_INSERT_CHECK;
    1084             : 
    1085             :         /*
    1086             :          * ExecWithCheckOptions() will skip any WCOs which are not of the kind
    1087             :          * we are looking for at this point.
    1088             :          */
    1089    12156408 :         if (resultRelInfo->ri_WithCheckOptions != NIL)
    1090         600 :             ExecWithCheckOptions(wco_kind, resultRelInfo, slot, estate);
    1091             : 
    1092             :         /*
    1093             :          * Check the constraints of the tuple.
    1094             :          */
    1095    12156216 :         if (resultRelationDesc->rd_att->constr)
    1096     3712962 :             ExecConstraints(resultRelInfo, slot, estate);
    1097             : 
    1098             :         /*
    1099             :          * Also check the tuple against the partition constraint, if there is
    1100             :          * one; except that if we got here via tuple-routing, we don't need to
    1101             :          * if there's no BR trigger defined on the partition.
    1102             :          */
    1103    12155510 :         if (resultRelationDesc->rd_rel->relispartition &&
    1104      728356 :             (resultRelInfo->ri_RootResultRelInfo == NULL ||
    1105      725538 :              (resultRelInfo->ri_TrigDesc &&
    1106        1574 :               resultRelInfo->ri_TrigDesc->trig_insert_before_row)))
    1107        3014 :             ExecPartitionCheck(resultRelInfo, slot, estate, true);
    1108             : 
    1109    12155342 :         if (onconflict != ONCONFLICT_NONE && resultRelInfo->ri_NumIndices > 0)
    1110        4112 :         {
    1111             :             /* Perform a speculative insertion. */
    1112             :             uint32      specToken;
    1113             :             ItemPointerData conflictTid;
    1114             :             ItemPointerData invalidItemPtr;
    1115             :             bool        specConflict;
    1116             :             List       *arbiterIndexes;
    1117             : 
    1118        9542 :             ItemPointerSetInvalid(&invalidItemPtr);
    1119        9542 :             arbiterIndexes = resultRelInfo->ri_onConflictArbiterIndexes;
    1120             : 
    1121             :             /*
    1122             :              * Do a non-conclusive check for conflicts first.
    1123             :              *
    1124             :              * We're not holding any locks yet, so this doesn't guarantee that
    1125             :              * the later insert won't conflict.  But it avoids leaving behind
    1126             :              * a lot of canceled speculative insertions, if you run a lot of
    1127             :              * INSERT ON CONFLICT statements that do conflict.
    1128             :              *
    1129             :              * We loop back here if we find a conflict below, either during
    1130             :              * the pre-check, or when we re-check after inserting the tuple
    1131             :              * speculatively.  Better allow interrupts in case some bug makes
    1132             :              * this an infinite loop.
    1133             :              */
    1134          10 :     vlock:
    1135        9552 :             CHECK_FOR_INTERRUPTS();
    1136        9552 :             specConflict = false;
    1137        9552 :             if (!ExecCheckIndexConstraints(resultRelInfo, slot, estate,
    1138             :                                            &conflictTid, &invalidItemPtr,
    1139             :                                            arbiterIndexes))
    1140             :             {
    1141             :                 /* committed conflict tuple found */
    1142        5418 :                 if (onconflict == ONCONFLICT_UPDATE)
    1143             :                 {
    1144             :                     /*
    1145             :                      * In case of ON CONFLICT DO UPDATE, execute the UPDATE
    1146             :                      * part.  Be prepared to retry if the UPDATE fails because
    1147             :                      * of another concurrent UPDATE/DELETE to the conflict
    1148             :                      * tuple.
    1149             :                      */
    1150        5206 :                     TupleTableSlot *returning = NULL;
    1151             : 
    1152        5206 :                     if (ExecOnConflictUpdate(context, resultRelInfo,
    1153             :                                              &conflictTid, slot, canSetTag,
    1154             :                                              &returning))
    1155             :                     {
    1156        5128 :                         InstrCountTuples2(&mtstate->ps, 1);
    1157        5128 :                         return returning;
    1158             :                     }
    1159             :                     else
    1160           0 :                         goto vlock;
    1161             :                 }
    1162             :                 else
    1163             :                 {
    1164             :                     /*
    1165             :                      * In case of ON CONFLICT DO NOTHING, do nothing. However,
    1166             :                      * verify that the tuple is visible to the executor's MVCC
    1167             :                      * snapshot at higher isolation levels.
    1168             :                      *
    1169             :                      * Using ExecGetReturningSlot() to store the tuple for the
    1170             :                      * recheck isn't that pretty, but we can't trivially use
    1171             :                      * the input slot, because it might not be of a compatible
    1172             :                      * type. As there's no conflicting usage of
    1173             :                      * ExecGetReturningSlot() in the DO NOTHING case...
    1174             :                      */
    1175             :                     Assert(onconflict == ONCONFLICT_NOTHING);
    1176         212 :                     ExecCheckTIDVisible(estate, resultRelInfo, &conflictTid,
    1177             :                                         ExecGetReturningSlot(estate, resultRelInfo));
    1178         192 :                     InstrCountTuples2(&mtstate->ps, 1);
    1179         192 :                     return NULL;
    1180             :                 }
    1181             :             }
    1182             : 
    1183             :             /*
    1184             :              * Before we start insertion proper, acquire our "speculative
    1185             :              * insertion lock".  Others can use that to wait for us to decide
    1186             :              * if we're going to go ahead with the insertion, instead of
    1187             :              * waiting for the whole transaction to complete.
    1188             :              */
    1189        4128 :             specToken = SpeculativeInsertionLockAcquire(GetCurrentTransactionId());
    1190             : 
    1191             :             /* insert the tuple, with the speculative token */
    1192        4128 :             table_tuple_insert_speculative(resultRelationDesc, slot,
    1193             :                                            estate->es_output_cid,
    1194             :                                            0,
    1195             :                                            NULL,
    1196             :                                            specToken);
    1197             : 
    1198             :             /* insert index entries for tuple */
    1199        4128 :             recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
    1200             :                                                    slot, estate, false, true,
    1201             :                                                    &specConflict,
    1202             :                                                    arbiterIndexes,
    1203             :                                                    false);
    1204             : 
    1205             :             /* adjust the tuple's state accordingly */
    1206        4122 :             table_tuple_complete_speculative(resultRelationDesc, slot,
    1207        4122 :                                              specToken, !specConflict);
    1208             : 
    1209             :             /*
    1210             :              * Wake up anyone waiting for our decision.  They will re-check
    1211             :              * the tuple, see that it's no longer speculative, and wait on our
    1212             :              * XID as if this was a regularly inserted tuple all along.  Or if
    1213             :              * we killed the tuple, they will see it's dead, and proceed as if
    1214             :              * the tuple never existed.
    1215             :              */
    1216        4122 :             SpeculativeInsertionLockRelease(GetCurrentTransactionId());
    1217             : 
    1218             :             /*
    1219             :              * If there was a conflict, start from the beginning.  We'll do
    1220             :              * the pre-check again, which will now find the conflicting tuple
    1221             :              * (unless it aborts before we get there).
    1222             :              */
    1223        4122 :             if (specConflict)
    1224             :             {
    1225          10 :                 list_free(recheckIndexes);
    1226          10 :                 goto vlock;
    1227             :             }
    1228             : 
    1229             :             /* Since there was no insertion conflict, we're done */
    1230             :         }
    1231             :         else
    1232             :         {
    1233             :             /* insert the tuple normally */
    1234    12145800 :             table_tuple_insert(resultRelationDesc, slot,
    1235             :                                estate->es_output_cid,
    1236             :                                0, NULL);
    1237             : 
    1238             :             /* insert index entries for tuple */
    1239    12145766 :             if (resultRelInfo->ri_NumIndices > 0)
    1240     3089196 :                 recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
    1241             :                                                        slot, estate, false,
    1242             :                                                        false, NULL, NIL,
    1243             :                                                        false);
    1244             :         }
    1245             :     }
    1246             : 
    1247    12151172 :     if (canSetTag)
    1248    12149994 :         (estate->es_processed)++;
    1249             : 
    1250             :     /*
    1251             :      * If this insert is the result of a partition key update that moved the
    1252             :      * tuple to a new partition, put this row into the transition NEW TABLE,
    1253             :      * if there is one. We need to do this separately for DELETE and INSERT
    1254             :      * because they happen on different tables.
    1255             :      */
    1256    12151172 :     ar_insert_trig_tcs = mtstate->mt_transition_capture;
    1257    12151172 :     if (mtstate->operation == CMD_UPDATE && mtstate->mt_transition_capture
    1258          54 :         && mtstate->mt_transition_capture->tcs_update_new_table)
    1259             :     {
    1260          48 :         ExecARUpdateTriggers(estate, resultRelInfo,
    1261             :                              NULL, NULL,
    1262             :                              NULL,
    1263             :                              NULL,
    1264             :                              slot,
    1265             :                              NULL,
    1266          48 :                              mtstate->mt_transition_capture,
    1267             :                              false);
    1268             : 
    1269             :         /*
    1270             :          * We've already captured the NEW TABLE row, so make sure any AR
    1271             :          * INSERT trigger fired below doesn't capture it again.
    1272             :          */
    1273          48 :         ar_insert_trig_tcs = NULL;
    1274             :     }
    1275             : 
    1276             :     /* AFTER ROW INSERT Triggers */
    1277    12151172 :     ExecARInsertTriggers(estate, resultRelInfo, slot, recheckIndexes,
    1278             :                          ar_insert_trig_tcs);
    1279             : 
    1280    12151172 :     list_free(recheckIndexes);
    1281             : 
    1282             :     /*
    1283             :      * Check any WITH CHECK OPTION constraints from parent views.  We are
    1284             :      * required to do this after testing all constraints and uniqueness
    1285             :      * violations per the SQL spec, so we do it after actually inserting the
    1286             :      * record into the heap and all indexes.
    1287             :      *
    1288             :      * ExecWithCheckOptions will elog(ERROR) if a violation is found, so the
    1289             :      * tuple will never be seen, if it violates the WITH CHECK OPTION.
    1290             :      *
    1291             :      * ExecWithCheckOptions() will skip any WCOs which are not of the kind we
    1292             :      * are looking for at this point.
    1293             :      */
    1294    12151172 :     if (resultRelInfo->ri_WithCheckOptions != NIL)
    1295         394 :         ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo, slot, estate);
    1296             : 
    1297             :     /* Process RETURNING if present */
    1298    12151026 :     if (resultRelInfo->ri_projectReturning)
    1299             :     {
    1300        3604 :         TupleTableSlot *oldSlot = NULL;
    1301             : 
    1302             :         /*
    1303             :          * If this is part of a cross-partition UPDATE, and the RETURNING list
    1304             :          * refers to any OLD columns, ExecDelete() will have saved the tuple
    1305             :          * deleted from the original partition, which we must use here to
    1306             :          * compute the OLD column values.  Otherwise, all OLD column values
    1307             :          * will be NULL.
    1308             :          */
    1309        3604 :         if (context->cpDeletedSlot)
    1310             :         {
    1311             :             TupleConversionMap *tupconv_map;
    1312             : 
    1313             :             /*
    1314             :              * Convert the OLD tuple to the new partition's format/slot, if
    1315             :              * needed.  Note that ExecDelete() already converted it to the
    1316             :              * root's partition's format/slot.
    1317             :              */
    1318          44 :             oldSlot = context->cpDeletedSlot;
    1319          44 :             tupconv_map = ExecGetRootToChildMap(resultRelInfo, estate);
    1320          44 :             if (tupconv_map != NULL)
    1321             :             {
    1322          14 :                 oldSlot = execute_attr_map_slot(tupconv_map->attrMap,
    1323             :                                                 oldSlot,
    1324             :                                                 ExecGetReturningSlot(estate,
    1325             :                                                                      resultRelInfo));
    1326             : 
    1327          14 :                 oldSlot->tts_tableOid = context->cpDeletedSlot->tts_tableOid;
    1328          14 :                 ItemPointerCopy(&context->cpDeletedSlot->tts_tid, &oldSlot->tts_tid);
    1329             :             }
    1330             :         }
    1331             : 
    1332        3604 :         result = ExecProcessReturning(context, resultRelInfo, CMD_INSERT,
    1333             :                                       oldSlot, slot, planSlot);
    1334             : 
    1335             :         /*
    1336             :          * For a cross-partition UPDATE, release the old tuple, first making
    1337             :          * sure that the result slot has a local copy of any pass-by-reference
    1338             :          * values.
    1339             :          */
    1340        3592 :         if (context->cpDeletedSlot)
    1341             :         {
    1342          44 :             ExecMaterializeSlot(result);
    1343          44 :             ExecClearTuple(oldSlot);
    1344          44 :             if (context->cpDeletedSlot != oldSlot)
    1345          14 :                 ExecClearTuple(context->cpDeletedSlot);
    1346          44 :             context->cpDeletedSlot = NULL;
    1347             :         }
    1348             :     }
    1349             : 
    1350    12151014 :     if (inserted_tuple)
    1351         808 :         *inserted_tuple = slot;
    1352    12151014 :     if (insert_destrel)
    1353         808 :         *insert_destrel = resultRelInfo;
    1354             : 
    1355    12151014 :     return result;
    1356             : }
    1357             : 
    1358             : /* ----------------------------------------------------------------
    1359             :  *      ExecBatchInsert
    1360             :  *
    1361             :  *      Insert multiple tuples in an efficient way.
    1362             :  *      Currently, this handles inserting into a foreign table without
    1363             :  *      RETURNING clause.
    1364             :  * ----------------------------------------------------------------
    1365             :  */
    1366             : static void
    1367          56 : ExecBatchInsert(ModifyTableState *mtstate,
    1368             :                 ResultRelInfo *resultRelInfo,
    1369             :                 TupleTableSlot **slots,
    1370             :                 TupleTableSlot **planSlots,
    1371             :                 int numSlots,
    1372             :                 EState *estate,
    1373             :                 bool canSetTag)
    1374             : {
    1375             :     int         i;
    1376          56 :     int         numInserted = numSlots;
    1377          56 :     TupleTableSlot *slot = NULL;
    1378             :     TupleTableSlot **rslots;
    1379             : 
    1380             :     /*
    1381             :      * insert into foreign table: let the FDW do it
    1382             :      */
    1383          56 :     rslots = resultRelInfo->ri_FdwRoutine->ExecForeignBatchInsert(estate,
    1384             :                                                                   resultRelInfo,
    1385             :                                                                   slots,
    1386             :                                                                   planSlots,
    1387             :                                                                   &numInserted);
    1388             : 
    1389         344 :     for (i = 0; i < numInserted; i++)
    1390             :     {
    1391         288 :         slot = rslots[i];
    1392             : 
    1393             :         /*
    1394             :          * AFTER ROW Triggers might reference the tableoid column, so
    1395             :          * (re-)initialize tts_tableOid before evaluating them.
    1396             :          */
    1397         288 :         slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
    1398             : 
    1399             :         /* AFTER ROW INSERT Triggers */
    1400         288 :         ExecARInsertTriggers(estate, resultRelInfo, slot, NIL,
    1401         288 :                              mtstate->mt_transition_capture);
    1402             : 
    1403             :         /*
    1404             :          * Check any WITH CHECK OPTION constraints from parent views.  See the
    1405             :          * comment in ExecInsert.
    1406             :          */
    1407         288 :         if (resultRelInfo->ri_WithCheckOptions != NIL)
    1408           0 :             ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo, slot, estate);
    1409             :     }
    1410             : 
    1411          56 :     if (canSetTag && numInserted > 0)
    1412          56 :         estate->es_processed += numInserted;
    1413             : 
    1414             :     /* Clean up all the slots, ready for the next batch */
    1415         344 :     for (i = 0; i < numSlots; i++)
    1416             :     {
    1417         288 :         ExecClearTuple(slots[i]);
    1418         288 :         ExecClearTuple(planSlots[i]);
    1419             :     }
    1420          56 :     resultRelInfo->ri_NumSlots = 0;
    1421          56 : }
    1422             : 
    1423             : /*
    1424             :  * ExecPendingInserts -- flushes all pending inserts to the foreign tables
    1425             :  */
    1426             : static void
    1427          34 : ExecPendingInserts(EState *estate)
    1428             : {
    1429             :     ListCell   *l1,
    1430             :                *l2;
    1431             : 
    1432          70 :     forboth(l1, estate->es_insert_pending_result_relations,
    1433             :             l2, estate->es_insert_pending_modifytables)
    1434             :     {
    1435          36 :         ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(l1);
    1436          36 :         ModifyTableState *mtstate = (ModifyTableState *) lfirst(l2);
    1437             : 
    1438             :         Assert(mtstate);
    1439          36 :         ExecBatchInsert(mtstate, resultRelInfo,
    1440             :                         resultRelInfo->ri_Slots,
    1441             :                         resultRelInfo->ri_PlanSlots,
    1442             :                         resultRelInfo->ri_NumSlots,
    1443          36 :                         estate, mtstate->canSetTag);
    1444             :     }
    1445             : 
    1446          34 :     list_free(estate->es_insert_pending_result_relations);
    1447          34 :     list_free(estate->es_insert_pending_modifytables);
    1448          34 :     estate->es_insert_pending_result_relations = NIL;
    1449          34 :     estate->es_insert_pending_modifytables = NIL;
    1450          34 : }
    1451             : 
    1452             : /*
    1453             :  * ExecDeletePrologue -- subroutine for ExecDelete
    1454             :  *
    1455             :  * Prepare executor state for DELETE.  Actually, the only thing we have to do
    1456             :  * here is execute BEFORE ROW triggers.  We return false if one of them makes
    1457             :  * the delete a no-op; otherwise, return true.
    1458             :  */
    1459             : static bool
    1460     1646048 : ExecDeletePrologue(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    1461             :                    ItemPointer tupleid, HeapTuple oldtuple,
    1462             :                    TupleTableSlot **epqreturnslot, TM_Result *result)
    1463             : {
    1464     1646048 :     if (result)
    1465        1556 :         *result = TM_Ok;
    1466             : 
    1467             :     /* BEFORE ROW DELETE triggers */
    1468     1646048 :     if (resultRelInfo->ri_TrigDesc &&
    1469        7002 :         resultRelInfo->ri_TrigDesc->trig_delete_before_row)
    1470             :     {
    1471             :         /* Flush any pending inserts, so rows are visible to the triggers */
    1472         346 :         if (context->estate->es_insert_pending_result_relations != NIL)
    1473           2 :             ExecPendingInserts(context->estate);
    1474             : 
    1475         346 :         return ExecBRDeleteTriggers(context->estate, context->epqstate,
    1476             :                                     resultRelInfo, tupleid, oldtuple,
    1477             :                                     epqreturnslot, result, &context->tmfd);
    1478             :     }
    1479             : 
    1480     1645702 :     return true;
    1481             : }
    1482             : 
    1483             : /*
    1484             :  * ExecDeleteAct -- subroutine for ExecDelete
    1485             :  *
    1486             :  * Actually delete the tuple from a plain table.
    1487             :  *
    1488             :  * Caller is in charge of doing EvalPlanQual as necessary
    1489             :  */
    1490             : static TM_Result
    1491     1645870 : ExecDeleteAct(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    1492             :               ItemPointer tupleid, bool changingPart)
    1493             : {
    1494     1645870 :     EState     *estate = context->estate;
    1495             : 
    1496     1645870 :     return table_tuple_delete(resultRelInfo->ri_RelationDesc, tupleid,
    1497             :                               estate->es_output_cid,
    1498             :                               estate->es_snapshot,
    1499             :                               estate->es_crosscheck_snapshot,
    1500             :                               true /* wait for commit */ ,
    1501             :                               &context->tmfd,
    1502             :                               changingPart);
    1503             : }
    1504             : 
    1505             : /*
    1506             :  * ExecDeleteEpilogue -- subroutine for ExecDelete
    1507             :  *
    1508             :  * Closing steps of tuple deletion; this invokes AFTER FOR EACH ROW triggers,
    1509             :  * including the UPDATE triggers if the deletion is being done as part of a
    1510             :  * cross-partition tuple move.
    1511             :  */
    1512             : static void
    1513     1645818 : ExecDeleteEpilogue(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    1514             :                    ItemPointer tupleid, HeapTuple oldtuple, bool changingPart)
    1515             : {
    1516     1645818 :     ModifyTableState *mtstate = context->mtstate;
    1517     1645818 :     EState     *estate = context->estate;
    1518             :     TransitionCaptureState *ar_delete_trig_tcs;
    1519             : 
    1520             :     /*
    1521             :      * If this delete is the result of a partition key update that moved the
    1522             :      * tuple to a new partition, put this row into the transition OLD TABLE,
    1523             :      * if there is one. We need to do this separately for DELETE and INSERT
    1524             :      * because they happen on different tables.
    1525             :      */
    1526     1645818 :     ar_delete_trig_tcs = mtstate->mt_transition_capture;
    1527     1645818 :     if (mtstate->operation == CMD_UPDATE && mtstate->mt_transition_capture &&
    1528          54 :         mtstate->mt_transition_capture->tcs_update_old_table)
    1529             :     {
    1530          48 :         ExecARUpdateTriggers(estate, resultRelInfo,
    1531             :                              NULL, NULL,
    1532             :                              tupleid, oldtuple,
    1533          48 :                              NULL, NULL, mtstate->mt_transition_capture,
    1534             :                              false);
    1535             : 
    1536             :         /*
    1537             :          * We've already captured the OLD TABLE row, so make sure any AR
    1538             :          * DELETE trigger fired below doesn't capture it again.
    1539             :          */
    1540          48 :         ar_delete_trig_tcs = NULL;
    1541             :     }
    1542             : 
    1543             :     /* AFTER ROW DELETE Triggers */
    1544     1645818 :     ExecARDeleteTriggers(estate, resultRelInfo, tupleid, oldtuple,
    1545             :                          ar_delete_trig_tcs, changingPart);
    1546     1645818 : }
    1547             : 
    1548             : /* ----------------------------------------------------------------
    1549             :  *      ExecDelete
    1550             :  *
    1551             :  *      DELETE is like UPDATE, except that we delete the tuple and no
    1552             :  *      index modifications are needed.
    1553             :  *
    1554             :  *      When deleting from a table, tupleid identifies the tuple to delete and
    1555             :  *      oldtuple is NULL.  When deleting through a view INSTEAD OF trigger,
    1556             :  *      oldtuple is passed to the triggers and identifies what to delete, and
    1557             :  *      tupleid is invalid.  When deleting from a foreign table, tupleid is
    1558             :  *      invalid; the FDW has to figure out which row to delete using data from
    1559             :  *      the planSlot.  oldtuple is passed to foreign table triggers; it is
    1560             :  *      NULL when the foreign table has no relevant triggers.  We use
    1561             :  *      tupleDeleted to indicate whether the tuple is actually deleted,
    1562             :  *      callers can use it to decide whether to continue the operation.  When
    1563             :  *      this DELETE is a part of an UPDATE of partition-key, then the slot
    1564             :  *      returned by EvalPlanQual() is passed back using output parameter
    1565             :  *      epqreturnslot.
    1566             :  *
    1567             :  *      Returns RETURNING result if any, otherwise NULL.
    1568             :  * ----------------------------------------------------------------
    1569             :  */
    1570             : static TupleTableSlot *
    1571     1645534 : ExecDelete(ModifyTableContext *context,
    1572             :            ResultRelInfo *resultRelInfo,
    1573             :            ItemPointer tupleid,
    1574             :            HeapTuple oldtuple,
    1575             :            bool processReturning,
    1576             :            bool changingPart,
    1577             :            bool canSetTag,
    1578             :            TM_Result *tmresult,
    1579             :            bool *tupleDeleted,
    1580             :            TupleTableSlot **epqreturnslot)
    1581             : {
    1582     1645534 :     EState     *estate = context->estate;
    1583     1645534 :     Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    1584     1645534 :     TupleTableSlot *slot = NULL;
    1585             :     TM_Result   result;
    1586             :     bool        saveOld;
    1587             : 
    1588     1645534 :     if (tupleDeleted)
    1589        1042 :         *tupleDeleted = false;
    1590             : 
    1591             :     /*
    1592             :      * Prepare for the delete.  This includes BEFORE ROW triggers, so we're
    1593             :      * done if it says we are.
    1594             :      */
    1595     1645534 :     if (!ExecDeletePrologue(context, resultRelInfo, tupleid, oldtuple,
    1596             :                             epqreturnslot, tmresult))
    1597          52 :         return NULL;
    1598             : 
    1599             :     /* INSTEAD OF ROW DELETE Triggers */
    1600     1645466 :     if (resultRelInfo->ri_TrigDesc &&
    1601        6878 :         resultRelInfo->ri_TrigDesc->trig_delete_instead_row)
    1602          48 :     {
    1603             :         bool        dodelete;
    1604             : 
    1605             :         Assert(oldtuple != NULL);
    1606          54 :         dodelete = ExecIRDeleteTriggers(estate, resultRelInfo, oldtuple);
    1607             : 
    1608          54 :         if (!dodelete)          /* "do nothing" */
    1609           6 :             return NULL;
    1610             :     }
    1611     1645412 :     else if (resultRelInfo->ri_FdwRoutine)
    1612             :     {
    1613             :         /*
    1614             :          * delete from foreign table: let the FDW do it
    1615             :          *
    1616             :          * We offer the returning slot as a place to store RETURNING data,
    1617             :          * although the FDW can return some other slot if it wants.
    1618             :          */
    1619          42 :         slot = ExecGetReturningSlot(estate, resultRelInfo);
    1620          42 :         slot = resultRelInfo->ri_FdwRoutine->ExecForeignDelete(estate,
    1621             :                                                                resultRelInfo,
    1622             :                                                                slot,
    1623             :                                                                context->planSlot);
    1624             : 
    1625          42 :         if (slot == NULL)       /* "do nothing" */
    1626           0 :             return NULL;
    1627             : 
    1628             :         /*
    1629             :          * RETURNING expressions might reference the tableoid column, so
    1630             :          * (re)initialize tts_tableOid before evaluating them.
    1631             :          */
    1632          42 :         if (TTS_EMPTY(slot))
    1633           6 :             ExecStoreAllNullTuple(slot);
    1634             : 
    1635          42 :         slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    1636             :     }
    1637             :     else
    1638             :     {
    1639             :         /*
    1640             :          * delete the tuple
    1641             :          *
    1642             :          * Note: if context->estate->es_crosscheck_snapshot isn't
    1643             :          * InvalidSnapshot, we check that the row to be deleted is visible to
    1644             :          * that snapshot, and throw a can't-serialize error if not. This is a
    1645             :          * special-case behavior needed for referential integrity updates in
    1646             :          * transaction-snapshot mode transactions.
    1647             :          */
    1648     1645370 : ldelete:
    1649     1645374 :         result = ExecDeleteAct(context, resultRelInfo, tupleid, changingPart);
    1650             : 
    1651     1645338 :         if (tmresult)
    1652        1008 :             *tmresult = result;
    1653             : 
    1654     1645338 :         switch (result)
    1655             :         {
    1656          30 :             case TM_SelfModified:
    1657             : 
    1658             :                 /*
    1659             :                  * The target tuple was already updated or deleted by the
    1660             :                  * current command, or by a later command in the current
    1661             :                  * transaction.  The former case is possible in a join DELETE
    1662             :                  * where multiple tuples join to the same target tuple. This
    1663             :                  * is somewhat questionable, but Postgres has always allowed
    1664             :                  * it: we just ignore additional deletion attempts.
    1665             :                  *
    1666             :                  * The latter case arises if the tuple is modified by a
    1667             :                  * command in a BEFORE trigger, or perhaps by a command in a
    1668             :                  * volatile function used in the query.  In such situations we
    1669             :                  * should not ignore the deletion, but it is equally unsafe to
    1670             :                  * proceed.  We don't want to discard the original DELETE
    1671             :                  * while keeping the triggered actions based on its deletion;
    1672             :                  * and it would be no better to allow the original DELETE
    1673             :                  * while discarding updates that it triggered.  The row update
    1674             :                  * carries some information that might be important according
    1675             :                  * to business rules; so throwing an error is the only safe
    1676             :                  * course.
    1677             :                  *
    1678             :                  * If a trigger actually intends this type of interaction, it
    1679             :                  * can re-execute the DELETE and then return NULL to cancel
    1680             :                  * the outer delete.
    1681             :                  */
    1682          30 :                 if (context->tmfd.cmax != estate->es_output_cid)
    1683           6 :                     ereport(ERROR,
    1684             :                             (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    1685             :                              errmsg("tuple to be deleted was already modified by an operation triggered by the current command"),
    1686             :                              errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    1687             : 
    1688             :                 /* Else, already deleted by self; nothing to do */
    1689          24 :                 return NULL;
    1690             : 
    1691     1645244 :             case TM_Ok:
    1692     1645244 :                 break;
    1693             : 
    1694          58 :             case TM_Updated:
    1695             :                 {
    1696             :                     TupleTableSlot *inputslot;
    1697             :                     TupleTableSlot *epqslot;
    1698             : 
    1699          58 :                     if (IsolationUsesXactSnapshot())
    1700           2 :                         ereport(ERROR,
    1701             :                                 (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    1702             :                                  errmsg("could not serialize access due to concurrent update")));
    1703             : 
    1704             :                     /*
    1705             :                      * Already know that we're going to need to do EPQ, so
    1706             :                      * fetch tuple directly into the right slot.
    1707             :                      */
    1708          56 :                     EvalPlanQualBegin(context->epqstate);
    1709          56 :                     inputslot = EvalPlanQualSlot(context->epqstate, resultRelationDesc,
    1710             :                                                  resultRelInfo->ri_RangeTableIndex);
    1711             : 
    1712          56 :                     result = table_tuple_lock(resultRelationDesc, tupleid,
    1713             :                                               estate->es_snapshot,
    1714             :                                               inputslot, estate->es_output_cid,
    1715             :                                               LockTupleExclusive, LockWaitBlock,
    1716             :                                               TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
    1717             :                                               &context->tmfd);
    1718             : 
    1719          52 :                     switch (result)
    1720             :                     {
    1721          46 :                         case TM_Ok:
    1722             :                             Assert(context->tmfd.traversed);
    1723          46 :                             epqslot = EvalPlanQual(context->epqstate,
    1724             :                                                    resultRelationDesc,
    1725             :                                                    resultRelInfo->ri_RangeTableIndex,
    1726             :                                                    inputslot);
    1727          46 :                             if (TupIsNull(epqslot))
    1728             :                                 /* Tuple not passing quals anymore, exiting... */
    1729          30 :                                 return NULL;
    1730             : 
    1731             :                             /*
    1732             :                              * If requested, skip delete and pass back the
    1733             :                              * updated row.
    1734             :                              */
    1735          16 :                             if (epqreturnslot)
    1736             :                             {
    1737          12 :                                 *epqreturnslot = epqslot;
    1738          12 :                                 return NULL;
    1739             :                             }
    1740             :                             else
    1741           4 :                                 goto ldelete;
    1742             : 
    1743           4 :                         case TM_SelfModified:
    1744             : 
    1745             :                             /*
    1746             :                              * This can be reached when following an update
    1747             :                              * chain from a tuple updated by another session,
    1748             :                              * reaching a tuple that was already updated in
    1749             :                              * this transaction. If previously updated by this
    1750             :                              * command, ignore the delete, otherwise error
    1751             :                              * out.
    1752             :                              *
    1753             :                              * See also TM_SelfModified response to
    1754             :                              * table_tuple_delete() above.
    1755             :                              */
    1756           4 :                             if (context->tmfd.cmax != estate->es_output_cid)
    1757           2 :                                 ereport(ERROR,
    1758             :                                         (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    1759             :                                          errmsg("tuple to be deleted was already modified by an operation triggered by the current command"),
    1760             :                                          errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    1761           2 :                             return NULL;
    1762             : 
    1763           2 :                         case TM_Deleted:
    1764             :                             /* tuple already deleted; nothing to do */
    1765           2 :                             return NULL;
    1766             : 
    1767           0 :                         default:
    1768             : 
    1769             :                             /*
    1770             :                              * TM_Invisible should be impossible because we're
    1771             :                              * waiting for updated row versions, and would
    1772             :                              * already have errored out if the first version
    1773             :                              * is invisible.
    1774             :                              *
    1775             :                              * TM_Updated should be impossible, because we're
    1776             :                              * locking the latest version via
    1777             :                              * TUPLE_LOCK_FLAG_FIND_LAST_VERSION.
    1778             :                              */
    1779           0 :                             elog(ERROR, "unexpected table_tuple_lock status: %u",
    1780             :                                  result);
    1781             :                             return NULL;
    1782             :                     }
    1783             : 
    1784             :                     Assert(false);
    1785             :                     break;
    1786             :                 }
    1787             : 
    1788           6 :             case TM_Deleted:
    1789           6 :                 if (IsolationUsesXactSnapshot())
    1790           0 :                     ereport(ERROR,
    1791             :                             (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    1792             :                              errmsg("could not serialize access due to concurrent delete")));
    1793             :                 /* tuple already deleted; nothing to do */
    1794           6 :                 return NULL;
    1795             : 
    1796           0 :             default:
    1797           0 :                 elog(ERROR, "unrecognized table_tuple_delete status: %u",
    1798             :                      result);
    1799             :                 return NULL;
    1800             :         }
    1801             : 
    1802             :         /*
    1803             :          * Note: Normally one would think that we have to delete index tuples
    1804             :          * associated with the heap tuple now...
    1805             :          *
    1806             :          * ... but in POSTGRES, we have no need to do this because VACUUM will
    1807             :          * take care of it later.  We can't delete index tuples immediately
    1808             :          * anyway, since the tuple is still visible to other transactions.
    1809             :          */
    1810             :     }
    1811             : 
    1812     1645334 :     if (canSetTag)
    1813     1644142 :         (estate->es_processed)++;
    1814             : 
    1815             :     /* Tell caller that the delete actually happened. */
    1816     1645334 :     if (tupleDeleted)
    1817         964 :         *tupleDeleted = true;
    1818             : 
    1819     1645334 :     ExecDeleteEpilogue(context, resultRelInfo, tupleid, oldtuple, changingPart);
    1820             : 
    1821             :     /*
    1822             :      * Process RETURNING if present and if requested.
    1823             :      *
    1824             :      * If this is part of a cross-partition UPDATE, and the RETURNING list
    1825             :      * refers to any OLD column values, save the old tuple here for later
    1826             :      * processing of the RETURNING list by ExecInsert().
    1827             :      */
    1828     1645480 :     saveOld = changingPart && resultRelInfo->ri_projectReturning &&
    1829         146 :         resultRelInfo->ri_projectReturning->pi_state.flags & EEO_FLAG_HAS_OLD;
    1830             : 
    1831     1645334 :     if (resultRelInfo->ri_projectReturning && (processReturning || saveOld))
    1832             :     {
    1833             :         /*
    1834             :          * We have to put the target tuple into a slot, which means first we
    1835             :          * gotta fetch it.  We can use the trigger tuple slot.
    1836             :          */
    1837             :         TupleTableSlot *rslot;
    1838             : 
    1839        1002 :         if (resultRelInfo->ri_FdwRoutine)
    1840             :         {
    1841             :             /* FDW must have provided a slot containing the deleted row */
    1842             :             Assert(!TupIsNull(slot));
    1843             :         }
    1844             :         else
    1845             :         {
    1846         988 :             slot = ExecGetReturningSlot(estate, resultRelInfo);
    1847         988 :             if (oldtuple != NULL)
    1848             :             {
    1849          24 :                 ExecForceStoreHeapTuple(oldtuple, slot, false);
    1850             :             }
    1851             :             else
    1852             :             {
    1853         964 :                 if (!table_tuple_fetch_row_version(resultRelationDesc, tupleid,
    1854             :                                                    SnapshotAny, slot))
    1855           0 :                     elog(ERROR, "failed to fetch deleted tuple for DELETE RETURNING");
    1856             :             }
    1857             :         }
    1858             : 
    1859             :         /*
    1860             :          * If required, save the old tuple for later processing of the
    1861             :          * RETURNING list by ExecInsert().
    1862             :          */
    1863        1002 :         if (saveOld)
    1864             :         {
    1865             :             TupleConversionMap *tupconv_map;
    1866             : 
    1867             :             /*
    1868             :              * Convert the tuple into the root partition's format/slot, if
    1869             :              * needed.  ExecInsert() will then convert it to the new
    1870             :              * partition's format/slot, if necessary.
    1871             :              */
    1872          44 :             tupconv_map = ExecGetChildToRootMap(resultRelInfo);
    1873          44 :             if (tupconv_map != NULL)
    1874             :             {
    1875          18 :                 ResultRelInfo *rootRelInfo = context->mtstate->rootResultRelInfo;
    1876          18 :                 TupleTableSlot *oldSlot = slot;
    1877             : 
    1878          18 :                 slot = execute_attr_map_slot(tupconv_map->attrMap,
    1879             :                                              slot,
    1880             :                                              ExecGetReturningSlot(estate,
    1881             :                                                                   rootRelInfo));
    1882             : 
    1883          18 :                 slot->tts_tableOid = oldSlot->tts_tableOid;
    1884          18 :                 ItemPointerCopy(&oldSlot->tts_tid, &slot->tts_tid);
    1885             :             }
    1886             : 
    1887          44 :             context->cpDeletedSlot = slot;
    1888             : 
    1889          44 :             return NULL;
    1890             :         }
    1891             : 
    1892         958 :         rslot = ExecProcessReturning(context, resultRelInfo, CMD_DELETE,
    1893             :                                      slot, NULL, context->planSlot);
    1894             : 
    1895             :         /*
    1896             :          * Before releasing the target tuple again, make sure rslot has a
    1897             :          * local copy of any pass-by-reference values.
    1898             :          */
    1899         958 :         ExecMaterializeSlot(rslot);
    1900             : 
    1901         958 :         ExecClearTuple(slot);
    1902             : 
    1903         958 :         return rslot;
    1904             :     }
    1905             : 
    1906     1644332 :     return NULL;
    1907             : }
    1908             : 
    1909             : /*
    1910             :  * ExecCrossPartitionUpdate --- Move an updated tuple to another partition.
    1911             :  *
    1912             :  * This works by first deleting the old tuple from the current partition,
    1913             :  * followed by inserting the new tuple into the root parent table, that is,
    1914             :  * mtstate->rootResultRelInfo.  It will be re-routed from there to the
    1915             :  * correct partition.
    1916             :  *
    1917             :  * Returns true if the tuple has been successfully moved, or if it's found
    1918             :  * that the tuple was concurrently deleted so there's nothing more to do
    1919             :  * for the caller.
    1920             :  *
    1921             :  * False is returned if the tuple we're trying to move is found to have been
    1922             :  * concurrently updated.  In that case, the caller must check if the updated
    1923             :  * tuple that's returned in *retry_slot still needs to be re-routed, and call
    1924             :  * this function again or perform a regular update accordingly.  For MERGE,
    1925             :  * the updated tuple is not returned in *retry_slot; it has its own retry
    1926             :  * logic.
    1927             :  */
    1928             : static bool
    1929        1090 : ExecCrossPartitionUpdate(ModifyTableContext *context,
    1930             :                          ResultRelInfo *resultRelInfo,
    1931             :                          ItemPointer tupleid, HeapTuple oldtuple,
    1932             :                          TupleTableSlot *slot,
    1933             :                          bool canSetTag,
    1934             :                          UpdateContext *updateCxt,
    1935             :                          TM_Result *tmresult,
    1936             :                          TupleTableSlot **retry_slot,
    1937             :                          TupleTableSlot **inserted_tuple,
    1938             :                          ResultRelInfo **insert_destrel)
    1939             : {
    1940        1090 :     ModifyTableState *mtstate = context->mtstate;
    1941        1090 :     EState     *estate = mtstate->ps.state;
    1942             :     TupleConversionMap *tupconv_map;
    1943             :     bool        tuple_deleted;
    1944        1090 :     TupleTableSlot *epqslot = NULL;
    1945             : 
    1946        1090 :     context->cpDeletedSlot = NULL;
    1947        1090 :     context->cpUpdateReturningSlot = NULL;
    1948        1090 :     *retry_slot = NULL;
    1949             : 
    1950             :     /*
    1951             :      * Disallow an INSERT ON CONFLICT DO UPDATE that causes the original row
    1952             :      * to migrate to a different partition.  Maybe this can be implemented
    1953             :      * some day, but it seems a fringe feature with little redeeming value.
    1954             :      */
    1955        1090 :     if (((ModifyTable *) mtstate->ps.plan)->onConflictAction == ONCONFLICT_UPDATE)
    1956           0 :         ereport(ERROR,
    1957             :                 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
    1958             :                  errmsg("invalid ON UPDATE specification"),
    1959             :                  errdetail("The result tuple would appear in a different partition than the original tuple.")));
    1960             : 
    1961             :     /*
    1962             :      * When an UPDATE is run directly on a leaf partition, simply fail with a
    1963             :      * partition constraint violation error.
    1964             :      */
    1965        1090 :     if (resultRelInfo == mtstate->rootResultRelInfo)
    1966          48 :         ExecPartitionCheckEmitError(resultRelInfo, slot, estate);
    1967             : 
    1968             :     /* Initialize tuple routing info if not already done. */
    1969        1042 :     if (mtstate->mt_partition_tuple_routing == NULL)
    1970             :     {
    1971         662 :         Relation    rootRel = mtstate->rootResultRelInfo->ri_RelationDesc;
    1972             :         MemoryContext oldcxt;
    1973             : 
    1974             :         /* Things built here have to last for the query duration. */
    1975         662 :         oldcxt = MemoryContextSwitchTo(estate->es_query_cxt);
    1976             : 
    1977         662 :         mtstate->mt_partition_tuple_routing =
    1978         662 :             ExecSetupPartitionTupleRouting(estate, rootRel);
    1979             : 
    1980             :         /*
    1981             :          * Before a partition's tuple can be re-routed, it must first be
    1982             :          * converted to the root's format, so we'll need a slot for storing
    1983             :          * such tuples.
    1984             :          */
    1985             :         Assert(mtstate->mt_root_tuple_slot == NULL);
    1986         662 :         mtstate->mt_root_tuple_slot = table_slot_create(rootRel, NULL);
    1987             : 
    1988         662 :         MemoryContextSwitchTo(oldcxt);
    1989             :     }
    1990             : 
    1991             :     /*
    1992             :      * Row movement, part 1.  Delete the tuple, but skip RETURNING processing.
    1993             :      * We want to return rows from INSERT.
    1994             :      */
    1995        1042 :     ExecDelete(context, resultRelInfo,
    1996             :                tupleid, oldtuple,
    1997             :                false,           /* processReturning */
    1998             :                true,            /* changingPart */
    1999             :                false,           /* canSetTag */
    2000             :                tmresult, &tuple_deleted, &epqslot);
    2001             : 
    2002             :     /*
    2003             :      * For some reason if DELETE didn't happen (e.g. trigger prevented it, or
    2004             :      * it was already deleted by self, or it was concurrently deleted by
    2005             :      * another transaction), then we should skip the insert as well;
    2006             :      * otherwise, an UPDATE could cause an increase in the total number of
    2007             :      * rows across all partitions, which is clearly wrong.
    2008             :      *
    2009             :      * For a normal UPDATE, the case where the tuple has been the subject of a
    2010             :      * concurrent UPDATE or DELETE would be handled by the EvalPlanQual
    2011             :      * machinery, but for an UPDATE that we've translated into a DELETE from
    2012             :      * this partition and an INSERT into some other partition, that's not
    2013             :      * available, because CTID chains can't span relation boundaries.  We
    2014             :      * mimic the semantics to a limited extent by skipping the INSERT if the
    2015             :      * DELETE fails to find a tuple.  This ensures that two concurrent
    2016             :      * attempts to UPDATE the same tuple at the same time can't turn one tuple
    2017             :      * into two, and that an UPDATE of a just-deleted tuple can't resurrect
    2018             :      * it.
    2019             :      */
    2020        1040 :     if (!tuple_deleted)
    2021             :     {
    2022             :         /*
    2023             :          * epqslot will be typically NULL.  But when ExecDelete() finds that
    2024             :          * another transaction has concurrently updated the same row, it
    2025             :          * re-fetches the row, skips the delete, and epqslot is set to the
    2026             :          * re-fetched tuple slot.  In that case, we need to do all the checks
    2027             :          * again.  For MERGE, we leave everything to the caller (it must do
    2028             :          * additional rechecking, and might end up executing a different
    2029             :          * action entirely).
    2030             :          */
    2031          76 :         if (mtstate->operation == CMD_MERGE)
    2032          34 :             return *tmresult == TM_Ok;
    2033          42 :         else if (TupIsNull(epqslot))
    2034          36 :             return true;
    2035             :         else
    2036             :         {
    2037             :             /* Fetch the most recent version of old tuple. */
    2038             :             TupleTableSlot *oldSlot;
    2039             : 
    2040             :             /* ... but first, make sure ri_oldTupleSlot is initialized. */
    2041           6 :             if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
    2042           0 :                 ExecInitUpdateProjection(mtstate, resultRelInfo);
    2043           6 :             oldSlot = resultRelInfo->ri_oldTupleSlot;
    2044           6 :             if (!table_tuple_fetch_row_version(resultRelInfo->ri_RelationDesc,
    2045             :                                                tupleid,
    2046             :                                                SnapshotAny,
    2047             :                                                oldSlot))
    2048           0 :                 elog(ERROR, "failed to fetch tuple being updated");
    2049             :             /* and project the new tuple to retry the UPDATE with */
    2050           6 :             *retry_slot = ExecGetUpdateNewTuple(resultRelInfo, epqslot,
    2051             :                                                 oldSlot);
    2052           6 :             return false;
    2053             :         }
    2054             :     }
    2055             : 
    2056             :     /*
    2057             :      * resultRelInfo is one of the per-relation resultRelInfos.  So we should
    2058             :      * convert the tuple into root's tuple descriptor if needed, since
    2059             :      * ExecInsert() starts the search from root.
    2060             :      */
    2061         964 :     tupconv_map = ExecGetChildToRootMap(resultRelInfo);
    2062         964 :     if (tupconv_map != NULL)
    2063         314 :         slot = execute_attr_map_slot(tupconv_map->attrMap,
    2064             :                                      slot,
    2065             :                                      mtstate->mt_root_tuple_slot);
    2066             : 
    2067             :     /* Tuple routing starts from the root table. */
    2068         836 :     context->cpUpdateReturningSlot =
    2069         964 :         ExecInsert(context, mtstate->rootResultRelInfo, slot, canSetTag,
    2070             :                    inserted_tuple, insert_destrel);
    2071             : 
    2072             :     /*
    2073             :      * Reset the transition state that may possibly have been written by
    2074             :      * INSERT.
    2075             :      */
    2076         836 :     if (mtstate->mt_transition_capture)
    2077          54 :         mtstate->mt_transition_capture->tcs_original_insert_tuple = NULL;
    2078             : 
    2079             :     /* We're done moving. */
    2080         836 :     return true;
    2081             : }
    2082             : 
    2083             : /*
    2084             :  * ExecUpdatePrologue -- subroutine for ExecUpdate
    2085             :  *
    2086             :  * Prepare executor state for UPDATE.  This includes running BEFORE ROW
    2087             :  * triggers.  We return false if one of them makes the update a no-op;
    2088             :  * otherwise, return true.
    2089             :  */
    2090             : static bool
    2091      324436 : ExecUpdatePrologue(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    2092             :                    ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot,
    2093             :                    TM_Result *result)
    2094             : {
    2095      324436 :     Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    2096             : 
    2097      324436 :     if (result)
    2098        2134 :         *result = TM_Ok;
    2099             : 
    2100      324436 :     ExecMaterializeSlot(slot);
    2101             : 
    2102             :     /*
    2103             :      * Open the table's indexes, if we have not done so already, so that we
    2104             :      * can add new index entries for the updated tuple.
    2105             :      */
    2106      324436 :     if (resultRelationDesc->rd_rel->relhasindex &&
    2107      233500 :         resultRelInfo->ri_IndexRelationDescs == NULL)
    2108        8736 :         ExecOpenIndices(resultRelInfo, false);
    2109             : 
    2110             :     /* BEFORE ROW UPDATE triggers */
    2111      324436 :     if (resultRelInfo->ri_TrigDesc &&
    2112        6254 :         resultRelInfo->ri_TrigDesc->trig_update_before_row)
    2113             :     {
    2114             :         /* Flush any pending inserts, so rows are visible to the triggers */
    2115        2560 :         if (context->estate->es_insert_pending_result_relations != NIL)
    2116           2 :             ExecPendingInserts(context->estate);
    2117             : 
    2118        2560 :         return ExecBRUpdateTriggers(context->estate, context->epqstate,
    2119             :                                     resultRelInfo, tupleid, oldtuple, slot,
    2120             :                                     result, &context->tmfd);
    2121             :     }
    2122             : 
    2123      321876 :     return true;
    2124             : }
    2125             : 
    2126             : /*
    2127             :  * ExecUpdatePrepareSlot -- subroutine for ExecUpdateAct
    2128             :  *
    2129             :  * Apply the final modifications to the tuple slot before the update.
    2130             :  * (This is split out because we also need it in the foreign-table code path.)
    2131             :  */
    2132             : static void
    2133      324166 : ExecUpdatePrepareSlot(ResultRelInfo *resultRelInfo,
    2134             :                       TupleTableSlot *slot,
    2135             :                       EState *estate)
    2136             : {
    2137      324166 :     Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    2138             : 
    2139             :     /*
    2140             :      * Constraints and GENERATED expressions might reference the tableoid
    2141             :      * column, so (re-)initialize tts_tableOid before evaluating them.
    2142             :      */
    2143      324166 :     slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    2144             : 
    2145             :     /*
    2146             :      * Compute stored generated columns
    2147             :      */
    2148      324166 :     if (resultRelationDesc->rd_att->constr &&
    2149      196624 :         resultRelationDesc->rd_att->constr->has_generated_stored)
    2150         258 :         ExecComputeStoredGenerated(resultRelInfo, estate, slot,
    2151             :                                    CMD_UPDATE);
    2152      324166 : }
    2153             : 
    2154             : /*
    2155             :  * ExecUpdateAct -- subroutine for ExecUpdate
    2156             :  *
    2157             :  * Actually update the tuple, when operating on a plain table.  If the
    2158             :  * table is a partition, and the command was called referencing an ancestor
    2159             :  * partitioned table, this routine migrates the resulting tuple to another
    2160             :  * partition.
    2161             :  *
    2162             :  * The caller is in charge of keeping indexes current as necessary.  The
    2163             :  * caller is also in charge of doing EvalPlanQual if the tuple is found to
    2164             :  * be concurrently updated.  However, in case of a cross-partition update,
    2165             :  * this routine does it.
    2166             :  */
    2167             : static TM_Result
    2168      323974 : ExecUpdateAct(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    2169             :               ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot,
    2170             :               bool canSetTag, UpdateContext *updateCxt)
    2171             : {
    2172      323974 :     EState     *estate = context->estate;
    2173      323974 :     Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    2174             :     bool        partition_constraint_failed;
    2175             :     TM_Result   result;
    2176             : 
    2177      323974 :     updateCxt->crossPartUpdate = false;
    2178             : 
    2179             :     /*
    2180             :      * If we move the tuple to a new partition, we loop back here to recompute
    2181             :      * GENERATED values (which are allowed to be different across partitions)
    2182             :      * and recheck any RLS policies and constraints.  We do not fire any
    2183             :      * BEFORE triggers of the new partition, however.
    2184             :      */
    2185      323980 : lreplace:
    2186             :     /* Fill in GENERATEd columns */
    2187      323980 :     ExecUpdatePrepareSlot(resultRelInfo, slot, estate);
    2188             : 
    2189             :     /* ensure slot is independent, consider e.g. EPQ */
    2190      323980 :     ExecMaterializeSlot(slot);
    2191             : 
    2192             :     /*
    2193             :      * If partition constraint fails, this row might get moved to another
    2194             :      * partition, in which case we should check the RLS CHECK policy just
    2195             :      * before inserting into the new partition, rather than doing it here.
    2196             :      * This is because a trigger on that partition might again change the row.
    2197             :      * So skip the WCO checks if the partition constraint fails.
    2198             :      */
    2199      323980 :     partition_constraint_failed =
    2200      326694 :         resultRelationDesc->rd_rel->relispartition &&
    2201        2714 :         !ExecPartitionCheck(resultRelInfo, slot, estate, false);
    2202             : 
    2203             :     /* Check any RLS UPDATE WITH CHECK policies */
    2204      323980 :     if (!partition_constraint_failed &&
    2205      322890 :         resultRelInfo->ri_WithCheckOptions != NIL)
    2206             :     {
    2207             :         /*
    2208             :          * ExecWithCheckOptions() will skip any WCOs which are not of the kind
    2209             :          * we are looking for at this point.
    2210             :          */
    2211         492 :         ExecWithCheckOptions(WCO_RLS_UPDATE_CHECK,
    2212             :                              resultRelInfo, slot, estate);
    2213             :     }
    2214             : 
    2215             :     /*
    2216             :      * If a partition check failed, try to move the row into the right
    2217             :      * partition.
    2218             :      */
    2219      323926 :     if (partition_constraint_failed)
    2220             :     {
    2221             :         TupleTableSlot *inserted_tuple,
    2222             :                    *retry_slot;
    2223        1090 :         ResultRelInfo *insert_destrel = NULL;
    2224             : 
    2225             :         /*
    2226             :          * ExecCrossPartitionUpdate will first DELETE the row from the
    2227             :          * partition it's currently in and then insert it back into the root
    2228             :          * table, which will re-route it to the correct partition.  However,
    2229             :          * if the tuple has been concurrently updated, a retry is needed.
    2230             :          */
    2231        1090 :         if (ExecCrossPartitionUpdate(context, resultRelInfo,
    2232             :                                      tupleid, oldtuple, slot,
    2233             :                                      canSetTag, updateCxt,
    2234             :                                      &result,
    2235             :                                      &retry_slot,
    2236             :                                      &inserted_tuple,
    2237             :                                      &insert_destrel))
    2238             :         {
    2239             :             /* success! */
    2240         896 :             updateCxt->crossPartUpdate = true;
    2241             : 
    2242             :             /*
    2243             :              * If the partitioned table being updated is referenced in foreign
    2244             :              * keys, queue up trigger events to check that none of them were
    2245             :              * violated.  No special treatment is needed in
    2246             :              * non-cross-partition update situations, because the leaf
    2247             :              * partition's AR update triggers will take care of that.  During
    2248             :              * cross-partition updates implemented as delete on the source
    2249             :              * partition followed by insert on the destination partition,
    2250             :              * AR-UPDATE triggers of the root table (that is, the table
    2251             :              * mentioned in the query) must be fired.
    2252             :              *
    2253             :              * NULL insert_destrel means that the move failed to occur, that
    2254             :              * is, the update failed, so no need to anything in that case.
    2255             :              */
    2256         896 :             if (insert_destrel &&
    2257         808 :                 resultRelInfo->ri_TrigDesc &&
    2258         362 :                 resultRelInfo->ri_TrigDesc->trig_update_after_row)
    2259         300 :                 ExecCrossPartitionUpdateForeignKey(context,
    2260             :                                                    resultRelInfo,
    2261             :                                                    insert_destrel,
    2262             :                                                    tupleid, slot,
    2263             :                                                    inserted_tuple);
    2264             : 
    2265         900 :             return TM_Ok;
    2266             :         }
    2267             : 
    2268             :         /*
    2269             :          * No luck, a retry is needed.  If running MERGE, we do not do so
    2270             :          * here; instead let it handle that on its own rules.
    2271             :          */
    2272          16 :         if (context->mtstate->operation == CMD_MERGE)
    2273          10 :             return result;
    2274             : 
    2275             :         /*
    2276             :          * ExecCrossPartitionUpdate installed an updated version of the new
    2277             :          * tuple in the retry slot; start over.
    2278             :          */
    2279           6 :         slot = retry_slot;
    2280           6 :         goto lreplace;
    2281             :     }
    2282             : 
    2283             :     /*
    2284             :      * Check the constraints of the tuple.  We've already checked the
    2285             :      * partition constraint above; however, we must still ensure the tuple
    2286             :      * passes all other constraints, so we will call ExecConstraints() and
    2287             :      * have it validate all remaining checks.
    2288             :      */
    2289      322836 :     if (resultRelationDesc->rd_att->constr)
    2290      196000 :         ExecConstraints(resultRelInfo, slot, estate);
    2291             : 
    2292             :     /*
    2293             :      * replace the heap tuple
    2294             :      *
    2295             :      * Note: if es_crosscheck_snapshot isn't InvalidSnapshot, we check that
    2296             :      * the row to be updated is visible to that snapshot, and throw a
    2297             :      * can't-serialize error if not. This is a special-case behavior needed
    2298             :      * for referential integrity updates in transaction-snapshot mode
    2299             :      * transactions.
    2300             :      */
    2301      322762 :     result = table_tuple_update(resultRelationDesc, tupleid, slot,
    2302             :                                 estate->es_output_cid,
    2303             :                                 estate->es_snapshot,
    2304             :                                 estate->es_crosscheck_snapshot,
    2305             :                                 true /* wait for commit */ ,
    2306             :                                 &context->tmfd, &updateCxt->lockmode,
    2307             :                                 &updateCxt->updateIndexes);
    2308             : 
    2309      322738 :     return result;
    2310             : }
    2311             : 
    2312             : /*
    2313             :  * ExecUpdateEpilogue -- subroutine for ExecUpdate
    2314             :  *
    2315             :  * Closing steps of updating a tuple.  Must be called if ExecUpdateAct
    2316             :  * returns indicating that the tuple was updated.
    2317             :  */
    2318             : static void
    2319      322788 : ExecUpdateEpilogue(ModifyTableContext *context, UpdateContext *updateCxt,
    2320             :                    ResultRelInfo *resultRelInfo, ItemPointer tupleid,
    2321             :                    HeapTuple oldtuple, TupleTableSlot *slot)
    2322             : {
    2323      322788 :     ModifyTableState *mtstate = context->mtstate;
    2324      322788 :     List       *recheckIndexes = NIL;
    2325             : 
    2326             :     /* insert index entries for tuple if necessary */
    2327      322788 :     if (resultRelInfo->ri_NumIndices > 0 && (updateCxt->updateIndexes != TU_None))
    2328      177402 :         recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
    2329             :                                                slot, context->estate,
    2330             :                                                true, false,
    2331             :                                                NULL, NIL,
    2332      177402 :                                                (updateCxt->updateIndexes == TU_Summarizing));
    2333             : 
    2334             :     /* AFTER ROW UPDATE Triggers */
    2335      322696 :     ExecARUpdateTriggers(context->estate, resultRelInfo,
    2336             :                          NULL, NULL,
    2337             :                          tupleid, oldtuple, slot,
    2338             :                          recheckIndexes,
    2339      322696 :                          mtstate->operation == CMD_INSERT ?
    2340             :                          mtstate->mt_oc_transition_capture :
    2341             :                          mtstate->mt_transition_capture,
    2342             :                          false);
    2343             : 
    2344      322696 :     list_free(recheckIndexes);
    2345             : 
    2346             :     /*
    2347             :      * Check any WITH CHECK OPTION constraints from parent views.  We are
    2348             :      * required to do this after testing all constraints and uniqueness
    2349             :      * violations per the SQL spec, so we do it after actually updating the
    2350             :      * record in the heap and all indexes.
    2351             :      *
    2352             :      * ExecWithCheckOptions() will skip any WCOs which are not of the kind we
    2353             :      * are looking for at this point.
    2354             :      */
    2355      322696 :     if (resultRelInfo->ri_WithCheckOptions != NIL)
    2356         466 :         ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo,
    2357             :                              slot, context->estate);
    2358      322614 : }
    2359             : 
    2360             : /*
    2361             :  * Queues up an update event using the target root partitioned table's
    2362             :  * trigger to check that a cross-partition update hasn't broken any foreign
    2363             :  * keys pointing into it.
    2364             :  */
    2365             : static void
    2366         300 : ExecCrossPartitionUpdateForeignKey(ModifyTableContext *context,
    2367             :                                    ResultRelInfo *sourcePartInfo,
    2368             :                                    ResultRelInfo *destPartInfo,
    2369             :                                    ItemPointer tupleid,
    2370             :                                    TupleTableSlot *oldslot,
    2371             :                                    TupleTableSlot *newslot)
    2372             : {
    2373             :     ListCell   *lc;
    2374             :     ResultRelInfo *rootRelInfo;
    2375             :     List       *ancestorRels;
    2376             : 
    2377         300 :     rootRelInfo = sourcePartInfo->ri_RootResultRelInfo;
    2378         300 :     ancestorRels = ExecGetAncestorResultRels(context->estate, sourcePartInfo);
    2379             : 
    2380             :     /*
    2381             :      * For any foreign keys that point directly into a non-root ancestors of
    2382             :      * the source partition, we can in theory fire an update event to enforce
    2383             :      * those constraints using their triggers, if we could tell that both the
    2384             :      * source and the destination partitions are under the same ancestor. But
    2385             :      * for now, we simply report an error that those cannot be enforced.
    2386             :      */
    2387         654 :     foreach(lc, ancestorRels)
    2388             :     {
    2389         360 :         ResultRelInfo *rInfo = lfirst(lc);
    2390         360 :         TriggerDesc *trigdesc = rInfo->ri_TrigDesc;
    2391         360 :         bool        has_noncloned_fkey = false;
    2392             : 
    2393             :         /* Root ancestor's triggers will be processed. */
    2394         360 :         if (rInfo == rootRelInfo)
    2395         294 :             continue;
    2396             : 
    2397          66 :         if (trigdesc && trigdesc->trig_update_after_row)
    2398             :         {
    2399         228 :             for (int i = 0; i < trigdesc->numtriggers; i++)
    2400             :             {
    2401         168 :                 Trigger    *trig = &trigdesc->triggers[i];
    2402             : 
    2403         174 :                 if (!trig->tgisclone &&
    2404           6 :                     RI_FKey_trigger_type(trig->tgfoid) == RI_TRIGGER_PK)
    2405             :                 {
    2406           6 :                     has_noncloned_fkey = true;
    2407           6 :                     break;
    2408             :                 }
    2409             :             }
    2410             :         }
    2411             : 
    2412          66 :         if (has_noncloned_fkey)
    2413           6 :             ereport(ERROR,
    2414             :                     (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
    2415             :                      errmsg("cannot move tuple across partitions when a non-root ancestor of the source partition is directly referenced in a foreign key"),
    2416             :                      errdetail("A foreign key points to ancestor \"%s\" but not the root ancestor \"%s\".",
    2417             :                                RelationGetRelationName(rInfo->ri_RelationDesc),
    2418             :                                RelationGetRelationName(rootRelInfo->ri_RelationDesc)),
    2419             :                      errhint("Consider defining the foreign key on table \"%s\".",
    2420             :                              RelationGetRelationName(rootRelInfo->ri_RelationDesc))));
    2421             :     }
    2422             : 
    2423             :     /* Perform the root table's triggers. */
    2424         294 :     ExecARUpdateTriggers(context->estate,
    2425             :                          rootRelInfo, sourcePartInfo, destPartInfo,
    2426             :                          tupleid, NULL, newslot, NIL, NULL, true);
    2427         294 : }
    2428             : 
    2429             : /* ----------------------------------------------------------------
    2430             :  *      ExecUpdate
    2431             :  *
    2432             :  *      note: we can't run UPDATE queries with transactions
    2433             :  *      off because UPDATEs are actually INSERTs and our
    2434             :  *      scan will mistakenly loop forever, updating the tuple
    2435             :  *      it just inserted..  This should be fixed but until it
    2436             :  *      is, we don't want to get stuck in an infinite loop
    2437             :  *      which corrupts your database..
    2438             :  *
    2439             :  *      When updating a table, tupleid identifies the tuple to update and
    2440             :  *      oldtuple is NULL.  When updating through a view INSTEAD OF trigger,
    2441             :  *      oldtuple is passed to the triggers and identifies what to update, and
    2442             :  *      tupleid is invalid.  When updating a foreign table, tupleid is
    2443             :  *      invalid; the FDW has to figure out which row to update using data from
    2444             :  *      the planSlot.  oldtuple is passed to foreign table triggers; it is
    2445             :  *      NULL when the foreign table has no relevant triggers.
    2446             :  *
    2447             :  *      oldSlot contains the old tuple value.
    2448             :  *      slot contains the new tuple value to be stored.
    2449             :  *      planSlot is the output of the ModifyTable's subplan; we use it
    2450             :  *      to access values from other input tables (for RETURNING),
    2451             :  *      row-ID junk columns, etc.
    2452             :  *
    2453             :  *      Returns RETURNING result if any, otherwise NULL.  On exit, if tupleid
    2454             :  *      had identified the tuple to update, it will identify the tuple
    2455             :  *      actually updated after EvalPlanQual.
    2456             :  * ----------------------------------------------------------------
    2457             :  */
    2458             : static TupleTableSlot *
    2459      322302 : ExecUpdate(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    2460             :            ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *oldSlot,
    2461             :            TupleTableSlot *slot, bool canSetTag)
    2462             : {
    2463      322302 :     EState     *estate = context->estate;
    2464      322302 :     Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    2465      322302 :     UpdateContext updateCxt = {0};
    2466             :     TM_Result   result;
    2467             : 
    2468             :     /*
    2469             :      * abort the operation if not running transactions
    2470             :      */
    2471      322302 :     if (IsBootstrapProcessingMode())
    2472           0 :         elog(ERROR, "cannot UPDATE during bootstrap");
    2473             : 
    2474             :     /*
    2475             :      * Prepare for the update.  This includes BEFORE ROW triggers, so we're
    2476             :      * done if it says we are.
    2477             :      */
    2478      322302 :     if (!ExecUpdatePrologue(context, resultRelInfo, tupleid, oldtuple, slot, NULL))
    2479         132 :         return NULL;
    2480             : 
    2481             :     /* INSTEAD OF ROW UPDATE Triggers */
    2482      322146 :     if (resultRelInfo->ri_TrigDesc &&
    2483        5746 :         resultRelInfo->ri_TrigDesc->trig_update_instead_row)
    2484             :     {
    2485         126 :         if (!ExecIRUpdateTriggers(estate, resultRelInfo,
    2486             :                                   oldtuple, slot))
    2487          18 :             return NULL;        /* "do nothing" */
    2488             :     }
    2489      322020 :     else if (resultRelInfo->ri_FdwRoutine)
    2490             :     {
    2491             :         /* Fill in GENERATEd columns */
    2492         186 :         ExecUpdatePrepareSlot(resultRelInfo, slot, estate);
    2493             : 
    2494             :         /*
    2495             :          * update in foreign table: let the FDW do it
    2496             :          */
    2497         186 :         slot = resultRelInfo->ri_FdwRoutine->ExecForeignUpdate(estate,
    2498             :                                                                resultRelInfo,
    2499             :                                                                slot,
    2500             :                                                                context->planSlot);
    2501             : 
    2502         186 :         if (slot == NULL)       /* "do nothing" */
    2503           2 :             return NULL;
    2504             : 
    2505             :         /*
    2506             :          * AFTER ROW Triggers or RETURNING expressions might reference the
    2507             :          * tableoid column, so (re-)initialize tts_tableOid before evaluating
    2508             :          * them.  (This covers the case where the FDW replaced the slot.)
    2509             :          */
    2510         184 :         slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    2511             :     }
    2512             :     else
    2513             :     {
    2514             :         ItemPointerData lockedtid;
    2515             : 
    2516             :         /*
    2517             :          * If we generate a new candidate tuple after EvalPlanQual testing, we
    2518             :          * must loop back here to try again.  (We don't need to redo triggers,
    2519             :          * however.  If there are any BEFORE triggers then trigger.c will have
    2520             :          * done table_tuple_lock to lock the correct tuple, so there's no need
    2521             :          * to do them again.)
    2522             :          */
    2523      321834 : redo_act:
    2524      321936 :         lockedtid = *tupleid;
    2525      321936 :         result = ExecUpdateAct(context, resultRelInfo, tupleid, oldtuple, slot,
    2526             :                                canSetTag, &updateCxt);
    2527             : 
    2528             :         /*
    2529             :          * If ExecUpdateAct reports that a cross-partition update was done,
    2530             :          * then the RETURNING tuple (if any) has been projected and there's
    2531             :          * nothing else for us to do.
    2532             :          */
    2533      321620 :         if (updateCxt.crossPartUpdate)
    2534         884 :             return context->cpUpdateReturningSlot;
    2535             : 
    2536      320864 :         switch (result)
    2537             :         {
    2538          84 :             case TM_SelfModified:
    2539             : 
    2540             :                 /*
    2541             :                  * The target tuple was already updated or deleted by the
    2542             :                  * current command, or by a later command in the current
    2543             :                  * transaction.  The former case is possible in a join UPDATE
    2544             :                  * where multiple tuples join to the same target tuple. This
    2545             :                  * is pretty questionable, but Postgres has always allowed it:
    2546             :                  * we just execute the first update action and ignore
    2547             :                  * additional update attempts.
    2548             :                  *
    2549             :                  * The latter case arises if the tuple is modified by a
    2550             :                  * command in a BEFORE trigger, or perhaps by a command in a
    2551             :                  * volatile function used in the query.  In such situations we
    2552             :                  * should not ignore the update, but it is equally unsafe to
    2553             :                  * proceed.  We don't want to discard the original UPDATE
    2554             :                  * while keeping the triggered actions based on it; and we
    2555             :                  * have no principled way to merge this update with the
    2556             :                  * previous ones.  So throwing an error is the only safe
    2557             :                  * course.
    2558             :                  *
    2559             :                  * If a trigger actually intends this type of interaction, it
    2560             :                  * can re-execute the UPDATE (assuming it can figure out how)
    2561             :                  * and then return NULL to cancel the outer update.
    2562             :                  */
    2563          84 :                 if (context->tmfd.cmax != estate->es_output_cid)
    2564           6 :                     ereport(ERROR,
    2565             :                             (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    2566             :                              errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
    2567             :                              errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    2568             : 
    2569             :                 /* Else, already updated by self; nothing to do */
    2570          78 :                 return NULL;
    2571             : 
    2572      320618 :             case TM_Ok:
    2573      320618 :                 break;
    2574             : 
    2575         154 :             case TM_Updated:
    2576             :                 {
    2577             :                     TupleTableSlot *inputslot;
    2578             :                     TupleTableSlot *epqslot;
    2579             : 
    2580         154 :                     if (IsolationUsesXactSnapshot())
    2581           4 :                         ereport(ERROR,
    2582             :                                 (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    2583             :                                  errmsg("could not serialize access due to concurrent update")));
    2584             : 
    2585             :                     /*
    2586             :                      * Already know that we're going to need to do EPQ, so
    2587             :                      * fetch tuple directly into the right slot.
    2588             :                      */
    2589         150 :                     inputslot = EvalPlanQualSlot(context->epqstate, resultRelationDesc,
    2590             :                                                  resultRelInfo->ri_RangeTableIndex);
    2591             : 
    2592         150 :                     result = table_tuple_lock(resultRelationDesc, tupleid,
    2593             :                                               estate->es_snapshot,
    2594             :                                               inputslot, estate->es_output_cid,
    2595             :                                               updateCxt.lockmode, LockWaitBlock,
    2596             :                                               TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
    2597             :                                               &context->tmfd);
    2598             : 
    2599         146 :                     switch (result)
    2600             :                     {
    2601         136 :                         case TM_Ok:
    2602             :                             Assert(context->tmfd.traversed);
    2603             : 
    2604         136 :                             epqslot = EvalPlanQual(context->epqstate,
    2605             :                                                    resultRelationDesc,
    2606             :                                                    resultRelInfo->ri_RangeTableIndex,
    2607             :                                                    inputslot);
    2608         136 :                             if (TupIsNull(epqslot))
    2609             :                                 /* Tuple not passing quals anymore, exiting... */
    2610          34 :                                 return NULL;
    2611             : 
    2612             :                             /* Make sure ri_oldTupleSlot is initialized. */
    2613         102 :                             if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
    2614           0 :                                 ExecInitUpdateProjection(context->mtstate,
    2615             :                                                          resultRelInfo);
    2616             : 
    2617         102 :                             if (resultRelInfo->ri_needLockTagTuple)
    2618             :                             {
    2619           2 :                                 UnlockTuple(resultRelationDesc,
    2620             :                                             &lockedtid, InplaceUpdateTupleLock);
    2621           2 :                                 LockTuple(resultRelationDesc,
    2622             :                                           tupleid, InplaceUpdateTupleLock);
    2623             :                             }
    2624             : 
    2625             :                             /* Fetch the most recent version of old tuple. */
    2626         102 :                             oldSlot = resultRelInfo->ri_oldTupleSlot;
    2627         102 :                             if (!table_tuple_fetch_row_version(resultRelationDesc,
    2628             :                                                                tupleid,
    2629             :                                                                SnapshotAny,
    2630             :                                                                oldSlot))
    2631           0 :                                 elog(ERROR, "failed to fetch tuple being updated");
    2632         102 :                             slot = ExecGetUpdateNewTuple(resultRelInfo,
    2633             :                                                          epqslot, oldSlot);
    2634         102 :                             goto redo_act;
    2635             : 
    2636           2 :                         case TM_Deleted:
    2637             :                             /* tuple already deleted; nothing to do */
    2638           2 :                             return NULL;
    2639             : 
    2640           8 :                         case TM_SelfModified:
    2641             : 
    2642             :                             /*
    2643             :                              * This can be reached when following an update
    2644             :                              * chain from a tuple updated by another session,
    2645             :                              * reaching a tuple that was already updated in
    2646             :                              * this transaction. If previously modified by
    2647             :                              * this command, ignore the redundant update,
    2648             :                              * otherwise error out.
    2649             :                              *
    2650             :                              * See also TM_SelfModified response to
    2651             :                              * table_tuple_update() above.
    2652             :                              */
    2653           8 :                             if (context->tmfd.cmax != estate->es_output_cid)
    2654           2 :                                 ereport(ERROR,
    2655             :                                         (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    2656             :                                          errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
    2657             :                                          errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    2658           6 :                             return NULL;
    2659             : 
    2660           0 :                         default:
    2661             :                             /* see table_tuple_lock call in ExecDelete() */
    2662           0 :                             elog(ERROR, "unexpected table_tuple_lock status: %u",
    2663             :                                  result);
    2664             :                             return NULL;
    2665             :                     }
    2666             :                 }
    2667             : 
    2668             :                 break;
    2669             : 
    2670           8 :             case TM_Deleted:
    2671           8 :                 if (IsolationUsesXactSnapshot())
    2672           0 :                     ereport(ERROR,
    2673             :                             (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    2674             :                              errmsg("could not serialize access due to concurrent delete")));
    2675             :                 /* tuple already deleted; nothing to do */
    2676           8 :                 return NULL;
    2677             : 
    2678           0 :             default:
    2679           0 :                 elog(ERROR, "unrecognized table_tuple_update status: %u",
    2680             :                      result);
    2681             :                 return NULL;
    2682             :         }
    2683             :     }
    2684             : 
    2685      320898 :     if (canSetTag)
    2686      320300 :         (estate->es_processed)++;
    2687             : 
    2688      320898 :     ExecUpdateEpilogue(context, &updateCxt, resultRelInfo, tupleid, oldtuple,
    2689             :                        slot);
    2690             : 
    2691             :     /* Process RETURNING if present */
    2692      320736 :     if (resultRelInfo->ri_projectReturning)
    2693        2408 :         return ExecProcessReturning(context, resultRelInfo, CMD_UPDATE,
    2694             :                                     oldSlot, slot, context->planSlot);
    2695             : 
    2696      318328 :     return NULL;
    2697             : }
    2698             : 
    2699             : /*
    2700             :  * ExecOnConflictUpdate --- execute UPDATE of INSERT ON CONFLICT DO UPDATE
    2701             :  *
    2702             :  * Try to lock tuple for update as part of speculative insertion.  If
    2703             :  * a qual originating from ON CONFLICT DO UPDATE is satisfied, update
    2704             :  * (but still lock row, even though it may not satisfy estate's
    2705             :  * snapshot).
    2706             :  *
    2707             :  * Returns true if we're done (with or without an update), or false if
    2708             :  * the caller must retry the INSERT from scratch.
    2709             :  */
    2710             : static bool
    2711        5206 : ExecOnConflictUpdate(ModifyTableContext *context,
    2712             :                      ResultRelInfo *resultRelInfo,
    2713             :                      ItemPointer conflictTid,
    2714             :                      TupleTableSlot *excludedSlot,
    2715             :                      bool canSetTag,
    2716             :                      TupleTableSlot **returning)
    2717             : {
    2718        5206 :     ModifyTableState *mtstate = context->mtstate;
    2719        5206 :     ExprContext *econtext = mtstate->ps.ps_ExprContext;
    2720        5206 :     Relation    relation = resultRelInfo->ri_RelationDesc;
    2721        5206 :     ExprState  *onConflictSetWhere = resultRelInfo->ri_onConflict->oc_WhereClause;
    2722        5206 :     TupleTableSlot *existing = resultRelInfo->ri_onConflict->oc_Existing;
    2723             :     TM_FailureData tmfd;
    2724             :     LockTupleMode lockmode;
    2725             :     TM_Result   test;
    2726             :     Datum       xminDatum;
    2727             :     TransactionId xmin;
    2728             :     bool        isnull;
    2729             : 
    2730             :     /*
    2731             :      * Parse analysis should have blocked ON CONFLICT for all system
    2732             :      * relations, which includes these.  There's no fundamental obstacle to
    2733             :      * supporting this; we'd just need to handle LOCKTAG_TUPLE like the other
    2734             :      * ExecUpdate() caller.
    2735             :      */
    2736             :     Assert(!resultRelInfo->ri_needLockTagTuple);
    2737             : 
    2738             :     /* Determine lock mode to use */
    2739        5206 :     lockmode = ExecUpdateLockMode(context->estate, resultRelInfo);
    2740             : 
    2741             :     /*
    2742             :      * Lock tuple for update.  Don't follow updates when tuple cannot be
    2743             :      * locked without doing so.  A row locking conflict here means our
    2744             :      * previous conclusion that the tuple is conclusively committed is not
    2745             :      * true anymore.
    2746             :      */
    2747        5206 :     test = table_tuple_lock(relation, conflictTid,
    2748        5206 :                             context->estate->es_snapshot,
    2749        5206 :                             existing, context->estate->es_output_cid,
    2750             :                             lockmode, LockWaitBlock, 0,
    2751             :                             &tmfd);
    2752        5206 :     switch (test)
    2753             :     {
    2754        5182 :         case TM_Ok:
    2755             :             /* success! */
    2756        5182 :             break;
    2757             : 
    2758          24 :         case TM_Invisible:
    2759             : 
    2760             :             /*
    2761             :              * This can occur when a just inserted tuple is updated again in
    2762             :              * the same command. E.g. because multiple rows with the same
    2763             :              * conflicting key values are inserted.
    2764             :              *
    2765             :              * This is somewhat similar to the ExecUpdate() TM_SelfModified
    2766             :              * case.  We do not want to proceed because it would lead to the
    2767             :              * same row being updated a second time in some unspecified order,
    2768             :              * and in contrast to plain UPDATEs there's no historical behavior
    2769             :              * to break.
    2770             :              *
    2771             :              * It is the user's responsibility to prevent this situation from
    2772             :              * occurring.  These problems are why the SQL standard similarly
    2773             :              * specifies that for SQL MERGE, an exception must be raised in
    2774             :              * the event of an attempt to update the same row twice.
    2775             :              */
    2776          24 :             xminDatum = slot_getsysattr(existing,
    2777             :                                         MinTransactionIdAttributeNumber,
    2778             :                                         &isnull);
    2779             :             Assert(!isnull);
    2780          24 :             xmin = DatumGetTransactionId(xminDatum);
    2781             : 
    2782          24 :             if (TransactionIdIsCurrentTransactionId(xmin))
    2783          24 :                 ereport(ERROR,
    2784             :                         (errcode(ERRCODE_CARDINALITY_VIOLATION),
    2785             :                 /* translator: %s is a SQL command name */
    2786             :                          errmsg("%s command cannot affect row a second time",
    2787             :                                 "ON CONFLICT DO UPDATE"),
    2788             :                          errhint("Ensure that no rows proposed for insertion within the same command have duplicate constrained values.")));
    2789             : 
    2790             :             /* This shouldn't happen */
    2791           0 :             elog(ERROR, "attempted to lock invisible tuple");
    2792             :             break;
    2793             : 
    2794           0 :         case TM_SelfModified:
    2795             : 
    2796             :             /*
    2797             :              * This state should never be reached. As a dirty snapshot is used
    2798             :              * to find conflicting tuples, speculative insertion wouldn't have
    2799             :              * seen this row to conflict with.
    2800             :              */
    2801           0 :             elog(ERROR, "unexpected self-updated tuple");
    2802             :             break;
    2803             : 
    2804           0 :         case TM_Updated:
    2805           0 :             if (IsolationUsesXactSnapshot())
    2806           0 :                 ereport(ERROR,
    2807             :                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    2808             :                          errmsg("could not serialize access due to concurrent update")));
    2809             : 
    2810             :             /*
    2811             :              * As long as we don't support an UPDATE of INSERT ON CONFLICT for
    2812             :              * a partitioned table we shouldn't reach to a case where tuple to
    2813             :              * be lock is moved to another partition due to concurrent update
    2814             :              * of the partition key.
    2815             :              */
    2816             :             Assert(!ItemPointerIndicatesMovedPartitions(&tmfd.ctid));
    2817             : 
    2818             :             /*
    2819             :              * Tell caller to try again from the very start.
    2820             :              *
    2821             :              * It does not make sense to use the usual EvalPlanQual() style
    2822             :              * loop here, as the new version of the row might not conflict
    2823             :              * anymore, or the conflicting tuple has actually been deleted.
    2824             :              */
    2825           0 :             ExecClearTuple(existing);
    2826           0 :             return false;
    2827             : 
    2828           0 :         case TM_Deleted:
    2829           0 :             if (IsolationUsesXactSnapshot())
    2830           0 :                 ereport(ERROR,
    2831             :                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    2832             :                          errmsg("could not serialize access due to concurrent delete")));
    2833             : 
    2834             :             /* see TM_Updated case */
    2835             :             Assert(!ItemPointerIndicatesMovedPartitions(&tmfd.ctid));
    2836           0 :             ExecClearTuple(existing);
    2837           0 :             return false;
    2838             : 
    2839           0 :         default:
    2840           0 :             elog(ERROR, "unrecognized table_tuple_lock status: %u", test);
    2841             :     }
    2842             : 
    2843             :     /* Success, the tuple is locked. */
    2844             : 
    2845             :     /*
    2846             :      * Verify that the tuple is visible to our MVCC snapshot if the current
    2847             :      * isolation level mandates that.
    2848             :      *
    2849             :      * It's not sufficient to rely on the check within ExecUpdate() as e.g.
    2850             :      * CONFLICT ... WHERE clause may prevent us from reaching that.
    2851             :      *
    2852             :      * This means we only ever continue when a new command in the current
    2853             :      * transaction could see the row, even though in READ COMMITTED mode the
    2854             :      * tuple will not be visible according to the current statement's
    2855             :      * snapshot.  This is in line with the way UPDATE deals with newer tuple
    2856             :      * versions.
    2857             :      */
    2858        5182 :     ExecCheckTupleVisible(context->estate, relation, existing);
    2859             : 
    2860             :     /*
    2861             :      * Make tuple and any needed join variables available to ExecQual and
    2862             :      * ExecProject.  The EXCLUDED tuple is installed in ecxt_innertuple, while
    2863             :      * the target's existing tuple is installed in the scantuple.  EXCLUDED
    2864             :      * has been made to reference INNER_VAR in setrefs.c, but there is no
    2865             :      * other redirection.
    2866             :      */
    2867        5182 :     econtext->ecxt_scantuple = existing;
    2868        5182 :     econtext->ecxt_innertuple = excludedSlot;
    2869        5182 :     econtext->ecxt_outertuple = NULL;
    2870             : 
    2871        5182 :     if (!ExecQual(onConflictSetWhere, econtext))
    2872             :     {
    2873          32 :         ExecClearTuple(existing);   /* see return below */
    2874          32 :         InstrCountFiltered1(&mtstate->ps, 1);
    2875          32 :         return true;            /* done with the tuple */
    2876             :     }
    2877             : 
    2878        5150 :     if (resultRelInfo->ri_WithCheckOptions != NIL)
    2879             :     {
    2880             :         /*
    2881             :          * Check target's existing tuple against UPDATE-applicable USING
    2882             :          * security barrier quals (if any), enforced here as RLS checks/WCOs.
    2883             :          *
    2884             :          * The rewriter creates UPDATE RLS checks/WCOs for UPDATE security
    2885             :          * quals, and stores them as WCOs of "kind" WCO_RLS_CONFLICT_CHECK,
    2886             :          * but that's almost the extent of its special handling for ON
    2887             :          * CONFLICT DO UPDATE.
    2888             :          *
    2889             :          * The rewriter will also have associated UPDATE applicable straight
    2890             :          * RLS checks/WCOs for the benefit of the ExecUpdate() call that
    2891             :          * follows.  INSERTs and UPDATEs naturally have mutually exclusive WCO
    2892             :          * kinds, so there is no danger of spurious over-enforcement in the
    2893             :          * INSERT or UPDATE path.
    2894             :          */
    2895          60 :         ExecWithCheckOptions(WCO_RLS_CONFLICT_CHECK, resultRelInfo,
    2896             :                              existing,
    2897             :                              mtstate->ps.state);
    2898             :     }
    2899             : 
    2900             :     /* Project the new tuple version */
    2901        5126 :     ExecProject(resultRelInfo->ri_onConflict->oc_ProjInfo);
    2902             : 
    2903             :     /*
    2904             :      * Note that it is possible that the target tuple has been modified in
    2905             :      * this session, after the above table_tuple_lock. We choose to not error
    2906             :      * out in that case, in line with ExecUpdate's treatment of similar cases.
    2907             :      * This can happen if an UPDATE is triggered from within ExecQual(),
    2908             :      * ExecWithCheckOptions() or ExecProject() above, e.g. by selecting from a
    2909             :      * wCTE in the ON CONFLICT's SET.
    2910             :      */
    2911             : 
    2912             :     /* Execute UPDATE with projection */
    2913       10222 :     *returning = ExecUpdate(context, resultRelInfo,
    2914             :                             conflictTid, NULL, existing,
    2915        5126 :                             resultRelInfo->ri_onConflict->oc_ProjSlot,
    2916             :                             canSetTag);
    2917             : 
    2918             :     /*
    2919             :      * Clear out existing tuple, as there might not be another conflict among
    2920             :      * the next input rows. Don't want to hold resources till the end of the
    2921             :      * query.  First though, make sure that the returning slot, if any, has a
    2922             :      * local copy of any OLD pass-by-reference values, if it refers to any OLD
    2923             :      * columns.
    2924             :      */
    2925        5096 :     if (*returning != NULL &&
    2926         222 :         resultRelInfo->ri_projectReturning->pi_state.flags & EEO_FLAG_HAS_OLD)
    2927           6 :         ExecMaterializeSlot(*returning);
    2928             : 
    2929        5096 :     ExecClearTuple(existing);
    2930             : 
    2931        5096 :     return true;
    2932             : }
    2933             : 
    2934             : /*
    2935             :  * Perform MERGE.
    2936             :  */
    2937             : static TupleTableSlot *
    2938       14990 : ExecMerge(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    2939             :           ItemPointer tupleid, HeapTuple oldtuple, bool canSetTag)
    2940             : {
    2941       14990 :     TupleTableSlot *rslot = NULL;
    2942             :     bool        matched;
    2943             : 
    2944             :     /*-----
    2945             :      * If we are dealing with a WHEN MATCHED case, tupleid or oldtuple is
    2946             :      * valid, depending on whether the result relation is a table or a view.
    2947             :      * We execute the first action for which the additional WHEN MATCHED AND
    2948             :      * quals pass.  If an action without quals is found, that action is
    2949             :      * executed.
    2950             :      *
    2951             :      * Similarly, in the WHEN NOT MATCHED BY SOURCE case, tupleid or oldtuple
    2952             :      * is valid, and we look at the given WHEN NOT MATCHED BY SOURCE actions
    2953             :      * in sequence until one passes.  This is almost identical to the WHEN
    2954             :      * MATCHED case, and both cases are handled by ExecMergeMatched().
    2955             :      *
    2956             :      * Finally, in the WHEN NOT MATCHED [BY TARGET] case, both tupleid and
    2957             :      * oldtuple are invalid, and we look at the given WHEN NOT MATCHED [BY
    2958             :      * TARGET] actions in sequence until one passes.
    2959             :      *
    2960             :      * Things get interesting in case of concurrent update/delete of the
    2961             :      * target tuple. Such concurrent update/delete is detected while we are
    2962             :      * executing a WHEN MATCHED or WHEN NOT MATCHED BY SOURCE action.
    2963             :      *
    2964             :      * A concurrent update can:
    2965             :      *
    2966             :      * 1. modify the target tuple so that the results from checking any
    2967             :      *    additional quals attached to WHEN MATCHED or WHEN NOT MATCHED BY
    2968             :      *    SOURCE actions potentially change, but the result from the join
    2969             :      *    quals does not change.
    2970             :      *
    2971             :      *    In this case, we are still dealing with the same kind of match
    2972             :      *    (MATCHED or NOT MATCHED BY SOURCE).  We recheck the same list of
    2973             :      *    actions from the start and choose the first one that satisfies the
    2974             :      *    new target tuple.
    2975             :      *
    2976             :      * 2. modify the target tuple in the WHEN MATCHED case so that the join
    2977             :      *    quals no longer pass and hence the source and target tuples no
    2978             :      *    longer match.
    2979             :      *
    2980             :      *    In this case, we are now dealing with a NOT MATCHED case, and we
    2981             :      *    process both WHEN NOT MATCHED BY SOURCE and WHEN NOT MATCHED [BY
    2982             :      *    TARGET] actions.  First ExecMergeMatched() processes the list of
    2983             :      *    WHEN NOT MATCHED BY SOURCE actions in sequence until one passes,
    2984             :      *    then ExecMergeNotMatched() processes any WHEN NOT MATCHED [BY
    2985             :      *    TARGET] actions in sequence until one passes.  Thus we may execute
    2986             :      *    two actions; one of each kind.
    2987             :      *
    2988             :      * Thus we support concurrent updates that turn MATCHED candidate rows
    2989             :      * into NOT MATCHED rows.  However, we do not attempt to support cases
    2990             :      * that would turn NOT MATCHED rows into MATCHED rows, or which would
    2991             :      * cause a target row to match a different source row.
    2992             :      *
    2993             :      * A concurrent delete changes a WHEN MATCHED case to WHEN NOT MATCHED
    2994             :      * [BY TARGET].
    2995             :      *
    2996             :      * ExecMergeMatched() takes care of following the update chain and
    2997             :      * re-finding the qualifying WHEN MATCHED or WHEN NOT MATCHED BY SOURCE
    2998             :      * action, as long as the target tuple still exists. If the target tuple
    2999             :      * gets deleted or a concurrent update causes the join quals to fail, it
    3000             :      * returns a matched status of false and we call ExecMergeNotMatched().
    3001             :      * Given that ExecMergeMatched() always makes progress by following the
    3002             :      * update chain and we never switch from ExecMergeNotMatched() to
    3003             :      * ExecMergeMatched(), there is no risk of a livelock.
    3004             :      */
    3005       14990 :     matched = tupleid != NULL || oldtuple != NULL;
    3006       14990 :     if (matched)
    3007       12318 :         rslot = ExecMergeMatched(context, resultRelInfo, tupleid, oldtuple,
    3008             :                                  canSetTag, &matched);
    3009             : 
    3010             :     /*
    3011             :      * Deal with the NOT MATCHED case (either a NOT MATCHED tuple from the
    3012             :      * join, or a previously MATCHED tuple for which ExecMergeMatched() set
    3013             :      * "matched" to false, indicating that it no longer matches).
    3014             :      */
    3015       14900 :     if (!matched)
    3016             :     {
    3017             :         /*
    3018             :          * If a concurrent update turned a MATCHED case into a NOT MATCHED
    3019             :          * case, and we have both WHEN NOT MATCHED BY SOURCE and WHEN NOT
    3020             :          * MATCHED [BY TARGET] actions, and there is a RETURNING clause,
    3021             :          * ExecMergeMatched() may have already executed a WHEN NOT MATCHED BY
    3022             :          * SOURCE action, and computed the row to return.  If so, we cannot
    3023             :          * execute a WHEN NOT MATCHED [BY TARGET] action now, so mark it as
    3024             :          * pending (to be processed on the next call to ExecModifyTable()).
    3025             :          * Otherwise, just process the action now.
    3026             :          */
    3027        2688 :         if (rslot == NULL)
    3028        2686 :             rslot = ExecMergeNotMatched(context, resultRelInfo, canSetTag);
    3029             :         else
    3030           2 :             context->mtstate->mt_merge_pending_not_matched = context->planSlot;
    3031             :     }
    3032             : 
    3033       14840 :     return rslot;
    3034             : }
    3035             : 
    3036             : /*
    3037             :  * Check and execute the first qualifying MATCHED or NOT MATCHED BY SOURCE
    3038             :  * action, depending on whether the join quals are satisfied.  If the target
    3039             :  * relation is a table, the current target tuple is identified by tupleid.
    3040             :  * Otherwise, if the target relation is a view, oldtuple is the current target
    3041             :  * tuple from the view.
    3042             :  *
    3043             :  * We start from the first WHEN MATCHED or WHEN NOT MATCHED BY SOURCE action
    3044             :  * and check if the WHEN quals pass, if any. If the WHEN quals for the first
    3045             :  * action do not pass, we check the second, then the third and so on. If we
    3046             :  * reach the end without finding a qualifying action, we return NULL.
    3047             :  * Otherwise, we execute the qualifying action and return its RETURNING
    3048             :  * result, if any, or NULL.
    3049             :  *
    3050             :  * On entry, "*matched" is assumed to be true.  If a concurrent update or
    3051             :  * delete is detected that causes the join quals to no longer pass, we set it
    3052             :  * to false, indicating that the caller should process any NOT MATCHED [BY
    3053             :  * TARGET] actions.
    3054             :  *
    3055             :  * After a concurrent update, we restart from the first action to look for a
    3056             :  * new qualifying action to execute. If the join quals originally passed, and
    3057             :  * the concurrent update caused them to no longer pass, then we switch from
    3058             :  * the MATCHED to the NOT MATCHED BY SOURCE list of actions before restarting
    3059             :  * (and setting "*matched" to false).  As a result we may execute a WHEN NOT
    3060             :  * MATCHED BY SOURCE action, and set "*matched" to false, causing the caller
    3061             :  * to also execute a WHEN NOT MATCHED [BY TARGET] action.
    3062             :  */
    3063             : static TupleTableSlot *
    3064       12318 : ExecMergeMatched(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    3065             :                  ItemPointer tupleid, HeapTuple oldtuple, bool canSetTag,
    3066             :                  bool *matched)
    3067             : {
    3068       12318 :     ModifyTableState *mtstate = context->mtstate;
    3069       12318 :     List      **mergeActions = resultRelInfo->ri_MergeActions;
    3070             :     ItemPointerData lockedtid;
    3071             :     List       *actionStates;
    3072       12318 :     TupleTableSlot *newslot = NULL;
    3073       12318 :     TupleTableSlot *rslot = NULL;
    3074       12318 :     EState     *estate = context->estate;
    3075       12318 :     ExprContext *econtext = mtstate->ps.ps_ExprContext;
    3076             :     bool        isNull;
    3077       12318 :     EPQState   *epqstate = &mtstate->mt_epqstate;
    3078             :     ListCell   *l;
    3079             : 
    3080             :     /* Expect matched to be true on entry */
    3081             :     Assert(*matched);
    3082             : 
    3083             :     /*
    3084             :      * If there are no WHEN MATCHED or WHEN NOT MATCHED BY SOURCE actions, we
    3085             :      * are done.
    3086             :      */
    3087       12318 :     if (mergeActions[MERGE_WHEN_MATCHED] == NIL &&
    3088        1200 :         mergeActions[MERGE_WHEN_NOT_MATCHED_BY_SOURCE] == NIL)
    3089         528 :         return NULL;
    3090             : 
    3091             :     /*
    3092             :      * Make tuple and any needed join variables available to ExecQual and
    3093             :      * ExecProject. The target's existing tuple is installed in the scantuple.
    3094             :      * This target relation's slot is required only in the case of a MATCHED
    3095             :      * or NOT MATCHED BY SOURCE tuple and UPDATE/DELETE actions.
    3096             :      */
    3097       11790 :     econtext->ecxt_scantuple = resultRelInfo->ri_oldTupleSlot;
    3098       11790 :     econtext->ecxt_innertuple = context->planSlot;
    3099       11790 :     econtext->ecxt_outertuple = NULL;
    3100             : 
    3101             :     /*
    3102             :      * This routine is only invoked for matched target rows, so we should
    3103             :      * either have the tupleid of the target row, or an old tuple from the
    3104             :      * target wholerow junk attr.
    3105             :      */
    3106             :     Assert(tupleid != NULL || oldtuple != NULL);
    3107       11790 :     ItemPointerSetInvalid(&lockedtid);
    3108       11790 :     if (oldtuple != NULL)
    3109             :     {
    3110             :         Assert(!resultRelInfo->ri_needLockTagTuple);
    3111          96 :         ExecForceStoreHeapTuple(oldtuple, resultRelInfo->ri_oldTupleSlot,
    3112             :                                 false);
    3113             :     }
    3114             :     else
    3115             :     {
    3116       11694 :         if (resultRelInfo->ri_needLockTagTuple)
    3117             :         {
    3118             :             /*
    3119             :              * This locks even for CMD_DELETE, for CMD_NOTHING, and for tuples
    3120             :              * that don't match mas_whenqual.  MERGE on system catalogs is a
    3121             :              * minor use case, so don't bother optimizing those.
    3122             :              */
    3123        7764 :             LockTuple(resultRelInfo->ri_RelationDesc, tupleid,
    3124             :                       InplaceUpdateTupleLock);
    3125        7764 :             lockedtid = *tupleid;
    3126             :         }
    3127       11694 :         if (!table_tuple_fetch_row_version(resultRelInfo->ri_RelationDesc,
    3128             :                                            tupleid,
    3129             :                                            SnapshotAny,
    3130             :                                            resultRelInfo->ri_oldTupleSlot))
    3131           0 :             elog(ERROR, "failed to fetch the target tuple");
    3132             :     }
    3133             : 
    3134             :     /*
    3135             :      * Test the join condition.  If it's satisfied, perform a MATCHED action.
    3136             :      * Otherwise, perform a NOT MATCHED BY SOURCE action.
    3137             :      *
    3138             :      * Note that this join condition will be NULL if there are no NOT MATCHED
    3139             :      * BY SOURCE actions --- see transform_MERGE_to_join().  In that case, we
    3140             :      * need only consider MATCHED actions here.
    3141             :      */
    3142       11790 :     if (ExecQual(resultRelInfo->ri_MergeJoinCondition, econtext))
    3143       11608 :         actionStates = mergeActions[MERGE_WHEN_MATCHED];
    3144             :     else
    3145         182 :         actionStates = mergeActions[MERGE_WHEN_NOT_MATCHED_BY_SOURCE];
    3146             : 
    3147       11790 : lmerge_matched:
    3148             : 
    3149       21070 :     foreach(l, actionStates)
    3150             :     {
    3151       11918 :         MergeActionState *relaction = (MergeActionState *) lfirst(l);
    3152       11918 :         CmdType     commandType = relaction->mas_action->commandType;
    3153             :         TM_Result   result;
    3154       11918 :         UpdateContext updateCxt = {0};
    3155             : 
    3156             :         /*
    3157             :          * Test condition, if any.
    3158             :          *
    3159             :          * In the absence of any condition, we perform the action
    3160             :          * unconditionally (no need to check separately since ExecQual() will
    3161             :          * return true if there are no conditions to evaluate).
    3162             :          */
    3163       11918 :         if (!ExecQual(relaction->mas_whenqual, econtext))
    3164        9216 :             continue;
    3165             : 
    3166             :         /*
    3167             :          * Check if the existing target tuple meets the USING checks of
    3168             :          * UPDATE/DELETE RLS policies. If those checks fail, we throw an
    3169             :          * error.
    3170             :          *
    3171             :          * The WITH CHECK quals for UPDATE RLS policies are applied in
    3172             :          * ExecUpdateAct() and hence we need not do anything special to handle
    3173             :          * them.
    3174             :          *
    3175             :          * NOTE: We must do this after WHEN quals are evaluated, so that we
    3176             :          * check policies only when they matter.
    3177             :          */
    3178        2702 :         if (resultRelInfo->ri_WithCheckOptions && commandType != CMD_NOTHING)
    3179             :         {
    3180          90 :             ExecWithCheckOptions(commandType == CMD_UPDATE ?
    3181             :                                  WCO_RLS_MERGE_UPDATE_CHECK : WCO_RLS_MERGE_DELETE_CHECK,
    3182             :                                  resultRelInfo,
    3183             :                                  resultRelInfo->ri_oldTupleSlot,
    3184          90 :                                  context->mtstate->ps.state);
    3185             :         }
    3186             : 
    3187             :         /* Perform stated action */
    3188        2678 :         switch (commandType)
    3189             :         {
    3190        2134 :             case CMD_UPDATE:
    3191             : 
    3192             :                 /*
    3193             :                  * Project the output tuple, and use that to update the table.
    3194             :                  * We don't need to filter out junk attributes, because the
    3195             :                  * UPDATE action's targetlist doesn't have any.
    3196             :                  */
    3197        2134 :                 newslot = ExecProject(relaction->mas_proj);
    3198             : 
    3199        2134 :                 mtstate->mt_merge_action = relaction;
    3200        2134 :                 if (!ExecUpdatePrologue(context, resultRelInfo,
    3201             :                                         tupleid, NULL, newslot, &result))
    3202             :                 {
    3203          18 :                     if (result == TM_Ok)
    3204         156 :                         goto out;   /* "do nothing" */
    3205             : 
    3206          12 :                     break;      /* concurrent update/delete */
    3207             :                 }
    3208             : 
    3209             :                 /* INSTEAD OF ROW UPDATE Triggers */
    3210        2116 :                 if (resultRelInfo->ri_TrigDesc &&
    3211         334 :                     resultRelInfo->ri_TrigDesc->trig_update_instead_row)
    3212             :                 {
    3213          78 :                     if (!ExecIRUpdateTriggers(estate, resultRelInfo,
    3214             :                                               oldtuple, newslot))
    3215           0 :                         goto out;   /* "do nothing" */
    3216             :                 }
    3217             :                 else
    3218             :                 {
    3219             :                     /* checked ri_needLockTagTuple above */
    3220             :                     Assert(oldtuple == NULL);
    3221             : 
    3222        2038 :                     result = ExecUpdateAct(context, resultRelInfo, tupleid,
    3223             :                                            NULL, newslot, canSetTag,
    3224             :                                            &updateCxt);
    3225             : 
    3226             :                     /*
    3227             :                      * As in ExecUpdate(), if ExecUpdateAct() reports that a
    3228             :                      * cross-partition update was done, then there's nothing
    3229             :                      * else for us to do --- the UPDATE has been turned into a
    3230             :                      * DELETE and an INSERT, and we must not perform any of
    3231             :                      * the usual post-update tasks.  Also, the RETURNING tuple
    3232             :                      * (if any) has been projected, so we can just return
    3233             :                      * that.
    3234             :                      */
    3235        2018 :                     if (updateCxt.crossPartUpdate)
    3236             :                     {
    3237         134 :                         mtstate->mt_merge_updated += 1;
    3238         134 :                         rslot = context->cpUpdateReturningSlot;
    3239         134 :                         goto out;
    3240             :                     }
    3241             :                 }
    3242             : 
    3243        1962 :                 if (result == TM_Ok)
    3244             :                 {
    3245        1890 :                     ExecUpdateEpilogue(context, &updateCxt, resultRelInfo,
    3246             :                                        tupleid, NULL, newslot);
    3247        1878 :                     mtstate->mt_merge_updated += 1;
    3248             :                 }
    3249        1950 :                 break;
    3250             : 
    3251         514 :             case CMD_DELETE:
    3252         514 :                 mtstate->mt_merge_action = relaction;
    3253         514 :                 if (!ExecDeletePrologue(context, resultRelInfo, tupleid,
    3254             :                                         NULL, NULL, &result))
    3255             :                 {
    3256          12 :                     if (result == TM_Ok)
    3257           6 :                         goto out;   /* "do nothing" */
    3258             : 
    3259           6 :                     break;      /* concurrent update/delete */
    3260             :                 }
    3261             : 
    3262             :                 /* INSTEAD OF ROW DELETE Triggers */
    3263         502 :                 if (resultRelInfo->ri_TrigDesc &&
    3264          44 :                     resultRelInfo->ri_TrigDesc->trig_delete_instead_row)
    3265             :                 {
    3266           6 :                     if (!ExecIRDeleteTriggers(estate, resultRelInfo,
    3267             :                                               oldtuple))
    3268           0 :                         goto out;   /* "do nothing" */
    3269             :                 }
    3270             :                 else
    3271             :                 {
    3272             :                     /* checked ri_needLockTagTuple above */
    3273             :                     Assert(oldtuple == NULL);
    3274             : 
    3275         496 :                     result = ExecDeleteAct(context, resultRelInfo, tupleid,
    3276             :                                            false);
    3277             :                 }
    3278             : 
    3279         502 :                 if (result == TM_Ok)
    3280             :                 {
    3281         484 :                     ExecDeleteEpilogue(context, resultRelInfo, tupleid, NULL,
    3282             :                                        false);
    3283         484 :                     mtstate->mt_merge_deleted += 1;
    3284             :                 }
    3285         502 :                 break;
    3286             : 
    3287          30 :             case CMD_NOTHING:
    3288             :                 /* Doing nothing is always OK */
    3289          30 :                 result = TM_Ok;
    3290          30 :                 break;
    3291             : 
    3292           0 :             default:
    3293           0 :                 elog(ERROR, "unknown action in MERGE WHEN clause");
    3294             :         }
    3295             : 
    3296        2500 :         switch (result)
    3297             :         {
    3298        2392 :             case TM_Ok:
    3299             :                 /* all good; perform final actions */
    3300        2392 :                 if (canSetTag && commandType != CMD_NOTHING)
    3301        2344 :                     (estate->es_processed)++;
    3302             : 
    3303        2392 :                 break;
    3304             : 
    3305          32 :             case TM_SelfModified:
    3306             : 
    3307             :                 /*
    3308             :                  * The target tuple was already updated or deleted by the
    3309             :                  * current command, or by a later command in the current
    3310             :                  * transaction.  The former case is explicitly disallowed by
    3311             :                  * the SQL standard for MERGE, which insists that the MERGE
    3312             :                  * join condition should not join a target row to more than
    3313             :                  * one source row.
    3314             :                  *
    3315             :                  * The latter case arises if the tuple is modified by a
    3316             :                  * command in a BEFORE trigger, or perhaps by a command in a
    3317             :                  * volatile function used in the query.  In such situations we
    3318             :                  * should not ignore the MERGE action, but it is equally
    3319             :                  * unsafe to proceed.  We don't want to discard the original
    3320             :                  * MERGE action while keeping the triggered actions based on
    3321             :                  * it; and it would be no better to allow the original MERGE
    3322             :                  * action while discarding the updates that it triggered.  So
    3323             :                  * throwing an error is the only safe course.
    3324             :                  */
    3325          32 :                 if (context->tmfd.cmax != estate->es_output_cid)
    3326          12 :                     ereport(ERROR,
    3327             :                             (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    3328             :                              errmsg("tuple to be updated or deleted was already modified by an operation triggered by the current command"),
    3329             :                              errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    3330             : 
    3331          20 :                 if (TransactionIdIsCurrentTransactionId(context->tmfd.xmax))
    3332          20 :                     ereport(ERROR,
    3333             :                             (errcode(ERRCODE_CARDINALITY_VIOLATION),
    3334             :                     /* translator: %s is a SQL command name */
    3335             :                              errmsg("%s command cannot affect row a second time",
    3336             :                                     "MERGE"),
    3337             :                              errhint("Ensure that not more than one source row matches any one target row.")));
    3338             : 
    3339             :                 /* This shouldn't happen */
    3340           0 :                 elog(ERROR, "attempted to update or delete invisible tuple");
    3341             :                 break;
    3342             : 
    3343          10 :             case TM_Deleted:
    3344          10 :                 if (IsolationUsesXactSnapshot())
    3345           0 :                     ereport(ERROR,
    3346             :                             (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    3347             :                              errmsg("could not serialize access due to concurrent delete")));
    3348             : 
    3349             :                 /*
    3350             :                  * If the tuple was already deleted, set matched to false to
    3351             :                  * let caller handle it under NOT MATCHED [BY TARGET] clauses.
    3352             :                  */
    3353          10 :                 *matched = false;
    3354          10 :                 goto out;
    3355             : 
    3356          66 :             case TM_Updated:
    3357             :                 {
    3358             :                     bool        was_matched;
    3359             :                     Relation    resultRelationDesc;
    3360             :                     TupleTableSlot *epqslot,
    3361             :                                *inputslot;
    3362             :                     LockTupleMode lockmode;
    3363             : 
    3364             :                     /*
    3365             :                      * The target tuple was concurrently updated by some other
    3366             :                      * transaction.  If we are currently processing a MATCHED
    3367             :                      * action, use EvalPlanQual() with the new version of the
    3368             :                      * tuple and recheck the join qual, to detect a change
    3369             :                      * from the MATCHED to the NOT MATCHED cases.  If we are
    3370             :                      * already processing a NOT MATCHED BY SOURCE action, we
    3371             :                      * skip this (cannot switch from NOT MATCHED BY SOURCE to
    3372             :                      * MATCHED).
    3373             :                      */
    3374          66 :                     was_matched = relaction->mas_action->matchKind == MERGE_WHEN_MATCHED;
    3375          66 :                     resultRelationDesc = resultRelInfo->ri_RelationDesc;
    3376          66 :                     lockmode = ExecUpdateLockMode(estate, resultRelInfo);
    3377             : 
    3378          66 :                     if (was_matched)
    3379          66 :                         inputslot = EvalPlanQualSlot(epqstate, resultRelationDesc,
    3380             :                                                      resultRelInfo->ri_RangeTableIndex);
    3381             :                     else
    3382           0 :                         inputslot = resultRelInfo->ri_oldTupleSlot;
    3383             : 
    3384          66 :                     result = table_tuple_lock(resultRelationDesc, tupleid,
    3385             :                                               estate->es_snapshot,
    3386             :                                               inputslot, estate->es_output_cid,
    3387             :                                               lockmode, LockWaitBlock,
    3388             :                                               TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
    3389             :                                               &context->tmfd);
    3390          66 :                     switch (result)
    3391             :                     {
    3392          64 :                         case TM_Ok:
    3393             : 
    3394             :                             /*
    3395             :                              * If the tuple was updated and migrated to
    3396             :                              * another partition concurrently, the current
    3397             :                              * MERGE implementation can't follow.  There's
    3398             :                              * probably a better way to handle this case, but
    3399             :                              * it'd require recognizing the relation to which
    3400             :                              * the tuple moved, and setting our current
    3401             :                              * resultRelInfo to that.
    3402             :                              */
    3403          64 :                             if (ItemPointerIndicatesMovedPartitions(&context->tmfd.ctid))
    3404           0 :                                 ereport(ERROR,
    3405             :                                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
    3406             :                                          errmsg("tuple to be merged was already moved to another partition due to concurrent update")));
    3407             : 
    3408             :                             /*
    3409             :                              * If this was a MATCHED case, use EvalPlanQual()
    3410             :                              * to recheck the join condition.
    3411             :                              */
    3412          64 :                             if (was_matched)
    3413             :                             {
    3414          64 :                                 epqslot = EvalPlanQual(epqstate,
    3415             :                                                        resultRelationDesc,
    3416             :                                                        resultRelInfo->ri_RangeTableIndex,
    3417             :                                                        inputslot);
    3418             : 
    3419             :                                 /*
    3420             :                                  * If the subplan didn't return a tuple, then
    3421             :                                  * we must be dealing with an inner join for
    3422             :                                  * which the join condition no longer matches.
    3423             :                                  * This can only happen if there are no NOT
    3424             :                                  * MATCHED actions, and so there is nothing
    3425             :                                  * more to do.
    3426             :                                  */
    3427          64 :                                 if (TupIsNull(epqslot))
    3428           0 :                                     goto out;
    3429             : 
    3430             :                                 /*
    3431             :                                  * If we got a NULL ctid from the subplan, the
    3432             :                                  * join quals no longer pass and we switch to
    3433             :                                  * the NOT MATCHED BY SOURCE case.
    3434             :                                  */
    3435          64 :                                 (void) ExecGetJunkAttribute(epqslot,
    3436          64 :                                                             resultRelInfo->ri_RowIdAttNo,
    3437             :                                                             &isNull);
    3438          64 :                                 if (isNull)
    3439           4 :                                     *matched = false;
    3440             : 
    3441             :                                 /*
    3442             :                                  * Otherwise, recheck the join quals to see if
    3443             :                                  * we need to switch to the NOT MATCHED BY
    3444             :                                  * SOURCE case.
    3445             :                                  */
    3446          64 :                                 if (resultRelInfo->ri_needLockTagTuple)
    3447             :                                 {
    3448           2 :                                     if (ItemPointerIsValid(&lockedtid))
    3449           2 :                                         UnlockTuple(resultRelInfo->ri_RelationDesc, &lockedtid,
    3450             :                                                     InplaceUpdateTupleLock);
    3451           2 :                                     LockTuple(resultRelInfo->ri_RelationDesc, &context->tmfd.ctid,
    3452             :                                               InplaceUpdateTupleLock);
    3453           2 :                                     lockedtid = context->tmfd.ctid;
    3454             :                                 }
    3455          64 :                                 if (!table_tuple_fetch_row_version(resultRelationDesc,
    3456             :                                                                    &context->tmfd.ctid,
    3457             :                                                                    SnapshotAny,
    3458             :                                                                    resultRelInfo->ri_oldTupleSlot))
    3459           0 :                                     elog(ERROR, "failed to fetch the target tuple");
    3460             : 
    3461          64 :                                 if (*matched)
    3462          60 :                                     *matched = ExecQual(resultRelInfo->ri_MergeJoinCondition,
    3463             :                                                         econtext);
    3464             : 
    3465             :                                 /* Switch lists, if necessary */
    3466          64 :                                 if (!*matched)
    3467           6 :                                     actionStates = mergeActions[MERGE_WHEN_NOT_MATCHED_BY_SOURCE];
    3468             :                             }
    3469             : 
    3470             :                             /*
    3471             :                              * Loop back and process the MATCHED or NOT
    3472             :                              * MATCHED BY SOURCE actions from the start.
    3473             :                              */
    3474          64 :                             goto lmerge_matched;
    3475             : 
    3476           0 :                         case TM_Deleted:
    3477             : 
    3478             :                             /*
    3479             :                              * tuple already deleted; tell caller to run NOT
    3480             :                              * MATCHED [BY TARGET] actions
    3481             :                              */
    3482           0 :                             *matched = false;
    3483           0 :                             goto out;
    3484             : 
    3485           2 :                         case TM_SelfModified:
    3486             : 
    3487             :                             /*
    3488             :                              * This can be reached when following an update
    3489             :                              * chain from a tuple updated by another session,
    3490             :                              * reaching a tuple that was already updated or
    3491             :                              * deleted by the current command, or by a later
    3492             :                              * command in the current transaction. As above,
    3493             :                              * this should always be treated as an error.
    3494             :                              */
    3495           2 :                             if (context->tmfd.cmax != estate->es_output_cid)
    3496           0 :                                 ereport(ERROR,
    3497             :                                         (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
    3498             :                                          errmsg("tuple to be updated or deleted was already modified by an operation triggered by the current command"),
    3499             :                                          errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
    3500             : 
    3501           2 :                             if (TransactionIdIsCurrentTransactionId(context->tmfd.xmax))
    3502           2 :                                 ereport(ERROR,
    3503             :                                         (errcode(ERRCODE_CARDINALITY_VIOLATION),
    3504             :                                 /* translator: %s is a SQL command name */
    3505             :                                          errmsg("%s command cannot affect row a second time",
    3506             :                                                 "MERGE"),
    3507             :                                          errhint("Ensure that not more than one source row matches any one target row.")));
    3508             : 
    3509             :                             /* This shouldn't happen */
    3510           0 :                             elog(ERROR, "attempted to update or delete invisible tuple");
    3511             :                             goto out;
    3512             : 
    3513           0 :                         default:
    3514             :                             /* see table_tuple_lock call in ExecDelete() */
    3515           0 :                             elog(ERROR, "unexpected table_tuple_lock status: %u",
    3516             :                                  result);
    3517             :                             goto out;
    3518             :                     }
    3519             :                 }
    3520             : 
    3521           0 :             case TM_Invisible:
    3522             :             case TM_WouldBlock:
    3523             :             case TM_BeingModified:
    3524             :                 /* these should not occur */
    3525           0 :                 elog(ERROR, "unexpected tuple operation result: %d", result);
    3526             :                 break;
    3527             :         }
    3528             : 
    3529             :         /* Process RETURNING if present */
    3530        2392 :         if (resultRelInfo->ri_projectReturning)
    3531             :         {
    3532         408 :             switch (commandType)
    3533             :             {
    3534         174 :                 case CMD_UPDATE:
    3535         174 :                     rslot = ExecProcessReturning(context,
    3536             :                                                  resultRelInfo,
    3537             :                                                  CMD_UPDATE,
    3538             :                                                  resultRelInfo->ri_oldTupleSlot,
    3539             :                                                  newslot,
    3540             :                                                  context->planSlot);
    3541         174 :                     break;
    3542             : 
    3543         234 :                 case CMD_DELETE:
    3544         234 :                     rslot = ExecProcessReturning(context,
    3545             :                                                  resultRelInfo,
    3546             :                                                  CMD_DELETE,
    3547             :                                                  resultRelInfo->ri_oldTupleSlot,
    3548             :                                                  NULL,
    3549             :                                                  context->planSlot);
    3550         234 :                     break;
    3551             : 
    3552           0 :                 case CMD_NOTHING:
    3553           0 :                     break;
    3554             : 
    3555           0 :                 default:
    3556           0 :                     elog(ERROR, "unrecognized commandType: %d",
    3557             :                          (int) commandType);
    3558             :             }
    3559             :         }
    3560             : 
    3561             :         /*
    3562             :          * We've activated one of the WHEN clauses, so we don't search
    3563             :          * further. This is required behaviour, not an optimization.
    3564             :          */
    3565        2392 :         break;
    3566             :     }
    3567             : 
    3568             :     /*
    3569             :      * Successfully executed an action or no qualifying action was found.
    3570             :      */
    3571       11700 : out:
    3572       11700 :     if (ItemPointerIsValid(&lockedtid))
    3573        7764 :         UnlockTuple(resultRelInfo->ri_RelationDesc, &lockedtid,
    3574             :                     InplaceUpdateTupleLock);
    3575       11700 :     return rslot;
    3576             : }
    3577             : 
    3578             : /*
    3579             :  * Execute the first qualifying NOT MATCHED [BY TARGET] action.
    3580             :  */
    3581             : static TupleTableSlot *
    3582        2688 : ExecMergeNotMatched(ModifyTableContext *context, ResultRelInfo *resultRelInfo,
    3583             :                     bool canSetTag)
    3584             : {
    3585        2688 :     ModifyTableState *mtstate = context->mtstate;
    3586        2688 :     ExprContext *econtext = mtstate->ps.ps_ExprContext;
    3587             :     List       *actionStates;
    3588        2688 :     TupleTableSlot *rslot = NULL;
    3589             :     ListCell   *l;
    3590             : 
    3591             :     /*
    3592             :      * For INSERT actions, the root relation's merge action is OK since the
    3593             :      * INSERT's targetlist and the WHEN conditions can only refer to the
    3594             :      * source relation and hence it does not matter which result relation we
    3595             :      * work with.
    3596             :      *
    3597             :      * XXX does this mean that we can avoid creating copies of actionStates on
    3598             :      * partitioned tables, for not-matched actions?
    3599             :      */
    3600        2688 :     actionStates = resultRelInfo->ri_MergeActions[MERGE_WHEN_NOT_MATCHED_BY_TARGET];
    3601             : 
    3602             :     /*
    3603             :      * Make source tuple available to ExecQual and ExecProject. We don't need
    3604             :      * the target tuple, since the WHEN quals and targetlist can't refer to
    3605             :      * the target columns.
    3606             :      */
    3607        2688 :     econtext->ecxt_scantuple = NULL;
    3608        2688 :     econtext->ecxt_innertuple = context->planSlot;
    3609        2688 :     econtext->ecxt_outertuple = NULL;
    3610             : 
    3611        3558 :     foreach(l, actionStates)
    3612             :     {
    3613        2688 :         MergeActionState *action = (MergeActionState *) lfirst(l);
    3614        2688 :         CmdType     commandType = action->mas_action->commandType;
    3615             :         TupleTableSlot *newslot;
    3616             : 
    3617             :         /*
    3618             :          * Test condition, if any.
    3619             :          *
    3620             :          * In the absence of any condition, we perform the action
    3621             :          * unconditionally (no need to check separately since ExecQual() will
    3622             :          * return true if there are no conditions to evaluate).
    3623             :          */
    3624        2688 :         if (!ExecQual(action->mas_whenqual, econtext))
    3625         870 :             continue;
    3626             : 
    3627             :         /* Perform stated action */
    3628        1818 :         switch (commandType)
    3629             :         {
    3630        1818 :             case CMD_INSERT:
    3631             : 
    3632             :                 /*
    3633             :                  * Project the tuple.  In case of a partitioned table, the
    3634             :                  * projection was already built to use the root's descriptor,
    3635             :                  * so we don't need to map the tuple here.
    3636             :                  */
    3637        1818 :                 newslot = ExecProject(action->mas_proj);
    3638        1818 :                 mtstate->mt_merge_action = action;
    3639             : 
    3640        1818 :                 rslot = ExecInsert(context, mtstate->rootResultRelInfo,
    3641             :                                    newslot, canSetTag, NULL, NULL);
    3642        1758 :                 mtstate->mt_merge_inserted += 1;
    3643        1758 :                 break;
    3644           0 :             case CMD_NOTHING:
    3645             :                 /* Do nothing */
    3646           0 :                 break;
    3647           0 :             default:
    3648           0 :                 elog(ERROR, "unknown action in MERGE WHEN NOT MATCHED clause");
    3649             :         }
    3650             : 
    3651             :         /*
    3652             :          * We've activated one of the WHEN clauses, so we don't search
    3653             :          * further. This is required behaviour, not an optimization.
    3654             :          */
    3655        1758 :         break;
    3656             :     }
    3657             : 
    3658        2628 :     return rslot;
    3659             : }
    3660             : 
    3661             : /*
    3662             :  * Initialize state for execution of MERGE.
    3663             :  */
    3664             : void
    3665        1534 : ExecInitMerge(ModifyTableState *mtstate, EState *estate)
    3666             : {
    3667        1534 :     List       *mergeActionLists = mtstate->mt_mergeActionLists;
    3668        1534 :     List       *mergeJoinConditions = mtstate->mt_mergeJoinConditions;
    3669        1534 :     ResultRelInfo *rootRelInfo = mtstate->rootResultRelInfo;
    3670             :     ResultRelInfo *resultRelInfo;
    3671             :     ExprContext *econtext;
    3672             :     ListCell   *lc;
    3673             :     int         i;
    3674             : 
    3675        1534 :     if (mergeActionLists == NIL)
    3676           0 :         return;
    3677             : 
    3678        1534 :     mtstate->mt_merge_subcommands = 0;
    3679             : 
    3680        1534 :     if (mtstate->ps.ps_ExprContext == NULL)
    3681        1278 :         ExecAssignExprContext(estate, &mtstate->ps);
    3682        1534 :     econtext = mtstate->ps.ps_ExprContext;
    3683             : 
    3684             :     /*
    3685             :      * Create a MergeActionState for each action on the mergeActionList and
    3686             :      * add it to either a list of matched actions or not-matched actions.
    3687             :      *
    3688             :      * Similar logic appears in ExecInitPartitionInfo(), so if changing
    3689             :      * anything here, do so there too.
    3690             :      */
    3691        1534 :     i = 0;
    3692        3300 :     foreach(lc, mergeActionLists)
    3693             :     {
    3694        1766 :         List       *mergeActionList = lfirst(lc);
    3695             :         Node       *joinCondition;
    3696             :         TupleDesc   relationDesc;
    3697             :         ListCell   *l;
    3698             : 
    3699        1766 :         joinCondition = (Node *) list_nth(mergeJoinConditions, i);
    3700        1766 :         resultRelInfo = mtstate->resultRelInfo + i;
    3701        1766 :         i++;
    3702        1766 :         relationDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
    3703             : 
    3704             :         /* initialize slots for MERGE fetches from this rel */
    3705        1766 :         if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
    3706        1766 :             ExecInitMergeTupleSlots(mtstate, resultRelInfo);
    3707             : 
    3708             :         /* initialize state for join condition checking */
    3709        1766 :         resultRelInfo->ri_MergeJoinCondition =
    3710        1766 :             ExecInitQual((List *) joinCondition, &mtstate->ps);
    3711             : 
    3712        4856 :         foreach(l, mergeActionList)
    3713             :         {
    3714        3090 :             MergeAction *action = (MergeAction *) lfirst(l);
    3715             :             MergeActionState *action_state;
    3716             :             TupleTableSlot *tgtslot;
    3717             :             TupleDesc   tgtdesc;
    3718             : 
    3719             :             /*
    3720             :              * Build action merge state for this rel.  (For partitions,
    3721             :              * equivalent code exists in ExecInitPartitionInfo.)
    3722             :              */
    3723        3090 :             action_state = makeNode(MergeActionState);
    3724        3090 :             action_state->mas_action = action;
    3725        3090 :             action_state->mas_whenqual = ExecInitQual((List *) action->qual,
    3726             :                                                       &mtstate->ps);
    3727             : 
    3728             :             /*
    3729             :              * We create three lists - one for each MergeMatchKind - and stick
    3730             :              * the MergeActionState into the appropriate list.
    3731             :              */
    3732        6180 :             resultRelInfo->ri_MergeActions[action->matchKind] =
    3733        3090 :                 lappend(resultRelInfo->ri_MergeActions[action->matchKind],
    3734             :                         action_state);
    3735             : 
    3736        3090 :             switch (action->commandType)
    3737             :             {
    3738        1046 :                 case CMD_INSERT:
    3739             :                     /* INSERT actions always use rootRelInfo */
    3740        1046 :                     ExecCheckPlanOutput(rootRelInfo->ri_RelationDesc,
    3741             :                                         action->targetList);
    3742             : 
    3743             :                     /*
    3744             :                      * If the MERGE targets a partitioned table, any INSERT
    3745             :                      * actions must be routed through it, not the child
    3746             :                      * relations. Initialize the routing struct and the root
    3747             :                      * table's "new" tuple slot for that, if not already done.
    3748             :                      * The projection we prepare, for all relations, uses the
    3749             :                      * root relation descriptor, and targets the plan's root
    3750             :                      * slot.  (This is consistent with the fact that we
    3751             :                      * checked the plan output to match the root relation,
    3752             :                      * above.)
    3753             :                      */
    3754        1046 :                     if (rootRelInfo->ri_RelationDesc->rd_rel->relkind ==
    3755             :                         RELKIND_PARTITIONED_TABLE)
    3756             :                     {
    3757         328 :                         if (mtstate->mt_partition_tuple_routing == NULL)
    3758             :                         {
    3759             :                             /*
    3760             :                              * Initialize planstate for routing if not already
    3761             :                              * done.
    3762             :                              *
    3763             :                              * Note that the slot is managed as a standalone
    3764             :                              * slot belonging to ModifyTableState, so we pass
    3765             :                              * NULL for the 2nd argument.
    3766             :                              */
    3767         154 :                             mtstate->mt_root_tuple_slot =
    3768         154 :                                 table_slot_create(rootRelInfo->ri_RelationDesc,
    3769             :                                                   NULL);
    3770         154 :                             mtstate->mt_partition_tuple_routing =
    3771         154 :                                 ExecSetupPartitionTupleRouting(estate,
    3772             :                                                                rootRelInfo->ri_RelationDesc);
    3773             :                         }
    3774         328 :                         tgtslot = mtstate->mt_root_tuple_slot;
    3775         328 :                         tgtdesc = RelationGetDescr(rootRelInfo->ri_RelationDesc);
    3776             :                     }
    3777             :                     else
    3778             :                     {
    3779             :                         /*
    3780             :                          * If the MERGE targets an inherited table, we insert
    3781             :                          * into the root table, so we must initialize its
    3782             :                          * "new" tuple slot, if not already done, and use its
    3783             :                          * relation descriptor for the projection.
    3784             :                          *
    3785             :                          * For non-inherited tables, rootRelInfo and
    3786             :                          * resultRelInfo are the same, and the "new" tuple
    3787             :                          * slot will already have been initialized.
    3788             :                          */
    3789         718 :                         if (rootRelInfo->ri_newTupleSlot == NULL)
    3790          36 :                             rootRelInfo->ri_newTupleSlot =
    3791          36 :                                 table_slot_create(rootRelInfo->ri_RelationDesc,
    3792             :                                                   &estate->es_tupleTable);
    3793             : 
    3794         718 :                         tgtslot = rootRelInfo->ri_newTupleSlot;
    3795         718 :                         tgtdesc = RelationGetDescr(rootRelInfo->ri_RelationDesc);
    3796             :                     }
    3797             : 
    3798        1046 :                     action_state->mas_proj =
    3799        1046 :                         ExecBuildProjectionInfo(action->targetList, econtext,
    3800             :                                                 tgtslot,
    3801             :                                                 &mtstate->ps,
    3802             :                                                 tgtdesc);
    3803             : 
    3804        1046 :                     mtstate->mt_merge_subcommands |= MERGE_INSERT;
    3805        1046 :                     break;
    3806        1528 :                 case CMD_UPDATE:
    3807        1528 :                     action_state->mas_proj =
    3808        1528 :                         ExecBuildUpdateProjection(action->targetList,
    3809             :                                                   true,
    3810             :                                                   action->updateColnos,
    3811             :                                                   relationDesc,
    3812             :                                                   econtext,
    3813             :                                                   resultRelInfo->ri_newTupleSlot,
    3814             :                                                   &mtstate->ps);
    3815        1528 :                     mtstate->mt_merge_subcommands |= MERGE_UPDATE;
    3816        1528 :                     break;
    3817         452 :                 case CMD_DELETE:
    3818         452 :                     mtstate->mt_merge_subcommands |= MERGE_DELETE;
    3819         452 :                     break;
    3820          64 :                 case CMD_NOTHING:
    3821          64 :                     break;
    3822           0 :                 default:
    3823           0 :                     elog(ERROR, "unknown action in MERGE WHEN clause");
    3824             :                     break;
    3825             :             }
    3826             :         }
    3827             :     }
    3828             : 
    3829             :     /*
    3830             :      * If the MERGE targets an inherited table, any INSERT actions will use
    3831             :      * rootRelInfo, and rootRelInfo will not be in the resultRelInfo array.
    3832             :      * Therefore we must initialize its WITH CHECK OPTION constraints and
    3833             :      * RETURNING projection, as ExecInitModifyTable did for the resultRelInfo
    3834             :      * entries.
    3835             :      *
    3836             :      * Note that the planner does not build a withCheckOptionList or
    3837             :      * returningList for the root relation, but as in ExecInitPartitionInfo,
    3838             :      * we can use the first resultRelInfo entry as a reference to calculate
    3839             :      * the attno's for the root table.
    3840             :      */
    3841        1534 :     if (rootRelInfo != mtstate->resultRelInfo &&
    3842         238 :         rootRelInfo->ri_RelationDesc->rd_rel->relkind != RELKIND_PARTITIONED_TABLE &&
    3843          48 :         (mtstate->mt_merge_subcommands & MERGE_INSERT) != 0)
    3844             :     {
    3845          36 :         ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
    3846          36 :         Relation    rootRelation = rootRelInfo->ri_RelationDesc;
    3847          36 :         Relation    firstResultRel = mtstate->resultRelInfo[0].ri_RelationDesc;
    3848          36 :         int         firstVarno = mtstate->resultRelInfo[0].ri_RangeTableIndex;
    3849          36 :         AttrMap    *part_attmap = NULL;
    3850             :         bool        found_whole_row;
    3851             : 
    3852          36 :         if (node->withCheckOptionLists != NIL)
    3853             :         {
    3854             :             List       *wcoList;
    3855          18 :             List       *wcoExprs = NIL;
    3856             : 
    3857             :             /* There should be as many WCO lists as result rels */
    3858             :             Assert(list_length(node->withCheckOptionLists) ==
    3859             :                    list_length(node->resultRelations));
    3860             : 
    3861             :             /*
    3862             :              * Use the first WCO list as a reference. In the most common case,
    3863             :              * this will be for the same relation as rootRelInfo, and so there
    3864             :              * will be no need to adjust its attno's.
    3865             :              */
    3866          18 :             wcoList = linitial(node->withCheckOptionLists);
    3867          18 :             if (rootRelation != firstResultRel)
    3868             :             {
    3869             :                 /* Convert any Vars in it to contain the root's attno's */
    3870             :                 part_attmap =
    3871          18 :                     build_attrmap_by_name(RelationGetDescr(rootRelation),
    3872             :                                           RelationGetDescr(firstResultRel),
    3873             :                                           false);
    3874             : 
    3875             :                 wcoList = (List *)
    3876          18 :                     map_variable_attnos((Node *) wcoList,
    3877             :                                         firstVarno, 0,
    3878             :                                         part_attmap,
    3879          18 :                                         RelationGetForm(rootRelation)->reltype,
    3880             :                                         &found_whole_row);
    3881             :             }
    3882             : 
    3883          90 :             foreach(lc, wcoList)
    3884             :             {
    3885          72 :                 WithCheckOption *wco = lfirst_node(WithCheckOption, lc);
    3886          72 :                 ExprState  *wcoExpr = ExecInitQual(castNode(List, wco->qual),
    3887             :                                                    &mtstate->ps);
    3888             : 
    3889          72 :                 wcoExprs = lappend(wcoExprs, wcoExpr);
    3890             :             }
    3891             : 
    3892          18 :             rootRelInfo->ri_WithCheckOptions = wcoList;
    3893          18 :             rootRelInfo->ri_WithCheckOptionExprs = wcoExprs;
    3894             :         }
    3895             : 
    3896          36 :         if (node->returningLists != NIL)
    3897             :         {
    3898             :             List       *returningList;
    3899             : 
    3900             :             /* There should be as many returning lists as result rels */
    3901             :             Assert(list_length(node->returningLists) ==
    3902             :                    list_length(node->resultRelations));
    3903             : 
    3904             :             /*
    3905             :              * Use the first returning list as a reference. In the most common
    3906             :              * case, this will be for the same relation as rootRelInfo, and so
    3907             :              * there will be no need to adjust its attno's.
    3908             :              */
    3909           6 :             returningList = linitial(node->returningLists);
    3910           6 :             if (rootRelation != firstResultRel)
    3911             :             {
    3912             :                 /* Convert any Vars in it to contain the root's attno's */
    3913           6 :                 if (part_attmap == NULL)
    3914             :                     part_attmap =
    3915           0 :                         build_attrmap_by_name(RelationGetDescr(rootRelation),
    3916             :                                               RelationGetDescr(firstResultRel),
    3917             :                                               false);
    3918             : 
    3919             :                 returningList = (List *)
    3920           6 :                     map_variable_attnos((Node *) returningList,
    3921             :                                         firstVarno, 0,
    3922             :                                         part_attmap,
    3923           6 :                                         RelationGetForm(rootRelation)->reltype,
    3924             :                                         &found_whole_row);
    3925             :             }
    3926           6 :             rootRelInfo->ri_returningList = returningList;
    3927             : 
    3928             :             /* Initialize the RETURNING projection */
    3929           6 :             rootRelInfo->ri_projectReturning =
    3930           6 :                 ExecBuildProjectionInfo(returningList, econtext,
    3931             :                                         mtstate->ps.ps_ResultTupleSlot,
    3932             :                                         &mtstate->ps,
    3933             :                                         RelationGetDescr(rootRelation));
    3934             :         }
    3935             :     }
    3936             : }
    3937             : 
    3938             : /*
    3939             :  * Initializes the tuple slots in a ResultRelInfo for any MERGE action.
    3940             :  *
    3941             :  * We mark 'projectNewInfoValid' even though the projections themselves
    3942             :  * are not initialized here.
    3943             :  */
    3944             : void
    3945        1790 : ExecInitMergeTupleSlots(ModifyTableState *mtstate,
    3946             :                         ResultRelInfo *resultRelInfo)
    3947             : {
    3948        1790 :     EState     *estate = mtstate->ps.state;
    3949             : 
    3950             :     Assert(!resultRelInfo->ri_projectNewInfoValid);
    3951             : 
    3952        1790 :     resultRelInfo->ri_oldTupleSlot =
    3953        1790 :         table_slot_create(resultRelInfo->ri_RelationDesc,
    3954             :                           &estate->es_tupleTable);
    3955        1790 :     resultRelInfo->ri_newTupleSlot =
    3956        1790 :         table_slot_create(resultRelInfo->ri_RelationDesc,
    3957             :                           &estate->es_tupleTable);
    3958        1790 :     resultRelInfo->ri_projectNewInfoValid = true;
    3959        1790 : }
    3960             : 
    3961             : /*
    3962             :  * Process BEFORE EACH STATEMENT triggers
    3963             :  */
    3964             : static void
    3965      114096 : fireBSTriggers(ModifyTableState *node)
    3966             : {
    3967      114096 :     ModifyTable *plan = (ModifyTable *) node->ps.plan;
    3968      114096 :     ResultRelInfo *resultRelInfo = node->rootResultRelInfo;
    3969             : 
    3970      114096 :     switch (node->operation)
    3971             :     {
    3972       87154 :         case CMD_INSERT:
    3973       87154 :             ExecBSInsertTriggers(node->ps.state, resultRelInfo);
    3974       87142 :             if (plan->onConflictAction == ONCONFLICT_UPDATE)
    3975         834 :                 ExecBSUpdateTriggers(node->ps.state,
    3976             :                                      resultRelInfo);
    3977       87142 :             break;
    3978       13474 :         case CMD_UPDATE:
    3979       13474 :             ExecBSUpdateTriggers(node->ps.state, resultRelInfo);
    3980       13474 :             break;
    3981       12084 :         case CMD_DELETE:
    3982       12084 :             ExecBSDeleteTriggers(node->ps.state, resultRelInfo);
    3983       12084 :             break;
    3984        1384 :         case CMD_MERGE:
    3985        1384 :             if (node->mt_merge_subcommands & MERGE_INSERT)
    3986         770 :                 ExecBSInsertTriggers(node->ps.state, resultRelInfo);
    3987        1384 :             if (node->mt_merge_subcommands & MERGE_UPDATE)
    3988         936 :                 ExecBSUpdateTriggers(node->ps.state, resultRelInfo);
    3989        1384 :             if (node->mt_merge_subcommands & MERGE_DELETE)
    3990         368 :                 ExecBSDeleteTriggers(node->ps.state, resultRelInfo);
    3991        1384 :             break;
    3992           0 :         default:
    3993           0 :             elog(ERROR, "unknown operation");
    3994             :             break;
    3995             :     }
    3996      114084 : }
    3997             : 
    3998             : /*
    3999             :  * Process AFTER EACH STATEMENT triggers
    4000             :  */
    4001             : static void
    4002      110838 : fireASTriggers(ModifyTableState *node)
    4003             : {
    4004      110838 :     ModifyTable *plan = (ModifyTable *) node->ps.plan;
    4005      110838 :     ResultRelInfo *resultRelInfo = node->rootResultRelInfo;
    4006             : 
    4007      110838 :     switch (node->operation)
    4008             :     {
    4009       84860 :         case CMD_INSERT:
    4010       84860 :             if (plan->onConflictAction == ONCONFLICT_UPDATE)
    4011         732 :                 ExecASUpdateTriggers(node->ps.state,
    4012             :                                      resultRelInfo,
    4013         732 :                                      node->mt_oc_transition_capture);
    4014       84860 :             ExecASInsertTriggers(node->ps.state, resultRelInfo,
    4015       84860 :                                  node->mt_transition_capture);
    4016       84860 :             break;
    4017       12766 :         case CMD_UPDATE:
    4018       12766 :             ExecASUpdateTriggers(node->ps.state, resultRelInfo,
    4019       12766 :                                  node->mt_transition_capture);
    4020       12766 :             break;
    4021       11978 :         case CMD_DELETE:
    4022       11978 :             ExecASDeleteTriggers(node->ps.state, resultRelInfo,
    4023       11978 :                                  node->mt_transition_capture);
    4024       11978 :             break;
    4025        1234 :         case CMD_MERGE:
    4026        1234 :             if (node->mt_merge_subcommands & MERGE_DELETE)
    4027         332 :                 ExecASDeleteTriggers(node->ps.state, resultRelInfo,
    4028         332 :                                      node->mt_transition_capture);
    4029        1234 :             if (node->mt_merge_subcommands & MERGE_UPDATE)
    4030         840 :                 ExecASUpdateTriggers(node->ps.state, resultRelInfo,
    4031         840 :                                      node->mt_transition_capture);
    4032        1234 :             if (node->mt_merge_subcommands & MERGE_INSERT)
    4033         702 :                 ExecASInsertTriggers(node->ps.state, resultRelInfo,
    4034         702 :                                      node->mt_transition_capture);
    4035        1234 :             break;
    4036           0 :         default:
    4037           0 :             elog(ERROR, "unknown operation");
    4038             :             break;
    4039             :     }
    4040      110838 : }
    4041             : 
    4042             : /*
    4043             :  * Set up the state needed for collecting transition tuples for AFTER
    4044             :  * triggers.
    4045             :  */
    4046             : static void
    4047      114438 : ExecSetupTransitionCaptureState(ModifyTableState *mtstate, EState *estate)
    4048             : {
    4049      114438 :     ModifyTable *plan = (ModifyTable *) mtstate->ps.plan;
    4050      114438 :     ResultRelInfo *targetRelInfo = mtstate->rootResultRelInfo;
    4051             : 
    4052             :     /* Check for transition tables on the directly targeted relation. */
    4053      114438 :     mtstate->mt_transition_capture =
    4054      114438 :         MakeTransitionCaptureState(targetRelInfo->ri_TrigDesc,
    4055      114438 :                                    RelationGetRelid(targetRelInfo->ri_RelationDesc),
    4056             :                                    mtstate->operation);
    4057      114438 :     if (plan->operation == CMD_INSERT &&
    4058       87156 :         plan->onConflictAction == ONCONFLICT_UPDATE)
    4059         834 :         mtstate->mt_oc_transition_capture =
    4060         834 :             MakeTransitionCaptureState(targetRelInfo->ri_TrigDesc,
    4061         834 :                                        RelationGetRelid(targetRelInfo->ri_RelationDesc),
    4062             :                                        CMD_UPDATE);
    4063      114438 : }
    4064             : 
    4065             : /*
    4066             :  * ExecPrepareTupleRouting --- prepare for routing one tuple
    4067             :  *
    4068             :  * Determine the partition in which the tuple in slot is to be inserted,
    4069             :  * and return its ResultRelInfo in *partRelInfo.  The return value is
    4070             :  * a slot holding the tuple of the partition rowtype.
    4071             :  *
    4072             :  * This also sets the transition table information in mtstate based on the
    4073             :  * selected partition.
    4074             :  */
    4075             : static TupleTableSlot *
    4076      726332 : ExecPrepareTupleRouting(ModifyTableState *mtstate,
    4077             :                         EState *estate,
    4078             :                         PartitionTupleRouting *proute,
    4079             :                         ResultRelInfo *targetRelInfo,
    4080             :                         TupleTableSlot *slot,
    4081             :                         ResultRelInfo **partRelInfo)
    4082             : {
    4083             :     ResultRelInfo *partrel;
    4084             :     TupleConversionMap *map;
    4085             : 
    4086             :     /*
    4087             :      * Lookup the target partition's ResultRelInfo.  If ExecFindPartition does
    4088             :      * not find a valid partition for the tuple in 'slot' then an error is
    4089             :      * raised.  An error may also be raised if the found partition is not a
    4090             :      * valid target for INSERTs.  This is required since a partitioned table
    4091             :      * UPDATE to another partition becomes a DELETE+INSERT.
    4092             :      */
    4093      726332 :     partrel = ExecFindPartition(mtstate, targetRelInfo, proute, slot, estate);
    4094             : 
    4095             :     /*
    4096             :      * If we're capturing transition tuples, we might need to convert from the
    4097             :      * partition rowtype to root partitioned table's rowtype.  But if there
    4098             :      * are no BEFORE triggers on the partition that could change the tuple, we
    4099             :      * can just remember the original unconverted tuple to avoid a needless
    4100             :      * round trip conversion.
    4101             :      */
    4102      726128 :     if (mtstate->mt_transition_capture != NULL)
    4103             :     {
    4104             :         bool        has_before_insert_row_trig;
    4105             : 
    4106         192 :         has_before_insert_row_trig = (partrel->ri_TrigDesc &&
    4107          42 :                                       partrel->ri_TrigDesc->trig_insert_before_row);
    4108             : 
    4109         150 :         mtstate->mt_transition_capture->tcs_original_insert_tuple =
    4110         150 :             !has_before_insert_row_trig ? slot : NULL;
    4111             :     }
    4112             : 
    4113             :     /*
    4114             :      * Convert the tuple, if necessary.
    4115             :      */
    4116      726128 :     map = ExecGetRootToChildMap(partrel, estate);
    4117      726128 :     if (map != NULL)
    4118             :     {
    4119       68460 :         TupleTableSlot *new_slot = partrel->ri_PartitionTupleSlot;
    4120             : 
    4121       68460 :         slot = execute_attr_map_slot(map->attrMap, slot, new_slot);
    4122             :     }
    4123             : 
    4124      726128 :     *partRelInfo = partrel;
    4125      726128 :     return slot;
    4126             : }
    4127             : 
    4128             : /* ----------------------------------------------------------------
    4129             :  *     ExecModifyTable
    4130             :  *
    4131             :  *      Perform table modifications as required, and return RETURNING results
    4132             :  *      if needed.
    4133             :  * ----------------------------------------------------------------
    4134             :  */
    4135             : static TupleTableSlot *
    4136      122938 : ExecModifyTable(PlanState *pstate)
    4137             : {
    4138      122938 :     ModifyTableState *node = castNode(ModifyTableState, pstate);
    4139             :     ModifyTableContext context;
    4140      122938 :     EState     *estate = node->ps.state;
    4141      122938 :     CmdType     operation = node->operation;
    4142             :     ResultRelInfo *resultRelInfo;
    4143             :     PlanState  *subplanstate;
    4144             :     TupleTableSlot *slot;
    4145             :     TupleTableSlot *oldSlot;
    4146             :     ItemPointerData tuple_ctid;
    4147             :     HeapTupleData oldtupdata;
    4148             :     HeapTuple   oldtuple;
    4149             :     ItemPointer tupleid;
    4150             :     bool        tuplock;
    4151             : 
    4152      122938 :     CHECK_FOR_INTERRUPTS();
    4153             : 
    4154             :     /*
    4155             :      * This should NOT get called during EvalPlanQual; we should have passed a
    4156             :      * subplan tree to EvalPlanQual, instead.  Use a runtime test not just
    4157             :      * Assert because this condition is easy to miss in testing.  (Note:
    4158             :      * although ModifyTable should not get executed within an EvalPlanQual
    4159             :      * operation, we do have to allow it to be initialized and shut down in
    4160             :      * case it is within a CTE subplan.  Hence this test must be here, not in
    4161             :      * ExecInitModifyTable.)
    4162             :      */
    4163      122938 :     if (estate->es_epq_active != NULL)
    4164           0 :         elog(ERROR, "ModifyTable should not be called during EvalPlanQual");
    4165             : 
    4166             :     /*
    4167             :      * If we've already completed processing, don't try to do more.  We need
    4168             :      * this test because ExecPostprocessPlan might call us an extra time, and
    4169             :      * our subplan's nodes aren't necessarily robust against being called
    4170             :      * extra times.
    4171             :      */
    4172      122938 :     if (node->mt_done)
    4173         794 :         return NULL;
    4174             : 
    4175             :     /*
    4176             :      * On first call, fire BEFORE STATEMENT triggers before proceeding.
    4177             :      */
    4178      122144 :     if (node->fireBSTriggers)
    4179             :     {
    4180      114096 :         fireBSTriggers(node);
    4181      114084 :         node->fireBSTriggers = false;
    4182             :     }
    4183             : 
    4184             :     /* Preload local variables */
    4185      122132 :     resultRelInfo = node->resultRelInfo + node->mt_lastResultIndex;
    4186      122132 :     subplanstate = outerPlanState(node);
    4187             : 
    4188             :     /* Set global context */
    4189      122132 :     context.mtstate = node;
    4190      122132 :     context.epqstate = &node->mt_epqstate;
    4191      122132 :     context.estate = estate;
    4192             : 
    4193             :     /*
    4194             :      * Fetch rows from subplan, and execute the required table modification
    4195             :      * for each row.
    4196             :      */
    4197             :     for (;;)
    4198             :     {
    4199             :         /*
    4200             :          * Reset the per-output-tuple exprcontext.  This is needed because
    4201             :          * triggers expect to use that context as workspace.  It's a bit ugly
    4202             :          * to do this below the top level of the plan, however.  We might need
    4203             :          * to rethink this later.
    4204             :          */
    4205    14244950 :         ResetPerTupleExprContext(estate);
    4206             : 
    4207             :         /*
    4208             :          * Reset per-tuple memory context used for processing on conflict and
    4209             :          * returning clauses, to free any expression evaluation storage
    4210             :          * allocated in the previous cycle.
    4211             :          */
    4212    14244950 :         if (pstate->ps_ExprContext)
    4213      351582 :             ResetExprContext(pstate->ps_ExprContext);
    4214             : 
    4215             :         /*
    4216             :          * If there is a pending MERGE ... WHEN NOT MATCHED [BY TARGET] action
    4217             :          * to execute, do so now --- see the comments in ExecMerge().
    4218             :          */
    4219    14244950 :         if (node->mt_merge_pending_not_matched != NULL)
    4220             :         {
    4221           2 :             context.planSlot = node->mt_merge_pending_not_matched;
    4222           2 :             context.cpDeletedSlot = NULL;
    4223             : 
    4224           2 :             slot = ExecMergeNotMatched(&context, node->resultRelInfo,
    4225           2 :                                        node->canSetTag);
    4226             : 
    4227             :             /* Clear the pending action */
    4228           2 :             node->mt_merge_pending_not_matched = NULL;
    4229             : 
    4230             :             /*
    4231             :              * If we got a RETURNING result, return it to the caller.  We'll
    4232             :              * continue the work on next call.
    4233             :              */
    4234           2 :             if (slot)
    4235           2 :                 return slot;
    4236             : 
    4237           0 :             continue;           /* continue with the next tuple */
    4238             :         }
    4239             : 
    4240             :         /* Fetch the next row from subplan */
    4241    14244948 :         context.planSlot = ExecProcNode(subplanstate);
    4242    14244530 :         context.cpDeletedSlot = NULL;
    4243             : 
    4244             :         /* No more tuples to process? */
    4245    14244530 :         if (TupIsNull(context.planSlot))
    4246             :             break;
    4247             : 
    4248             :         /*
    4249             :          * When there are multiple result relations, each tuple contains a
    4250             :          * junk column that gives the OID of the rel from which it came.
    4251             :          * Extract it and select the correct result relation.
    4252             :          */
    4253    14133692 :         if (AttributeNumberIsValid(node->mt_resultOidAttno))
    4254             :         {
    4255             :             Datum       datum;
    4256             :             bool        isNull;
    4257             :             Oid         resultoid;
    4258             : 
    4259        5160 :             datum = ExecGetJunkAttribute(context.planSlot, node->mt_resultOidAttno,
    4260             :                                          &isNull);
    4261        5160 :             if (isNull)
    4262             :             {
    4263             :                 /*
    4264             :                  * For commands other than MERGE, any tuples having InvalidOid
    4265             :                  * for tableoid are errors.  For MERGE, we may need to handle
    4266             :                  * them as WHEN NOT MATCHED clauses if any, so do that.
    4267             :                  *
    4268             :                  * Note that we use the node's toplevel resultRelInfo, not any
    4269             :                  * specific partition's.
    4270             :                  */
    4271         508 :                 if (operation == CMD_MERGE)
    4272             :                 {
    4273         508 :                     EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
    4274             : 
    4275         508 :                     slot = ExecMerge(&context, node->resultRelInfo,
    4276         508 :                                      NULL, NULL, node->canSetTag);
    4277             : 
    4278             :                     /*
    4279             :                      * If we got a RETURNING result, return it to the caller.
    4280             :                      * We'll continue the work on next call.
    4281             :                      */
    4282         496 :                     if (slot)
    4283          38 :                         return slot;
    4284             : 
    4285         458 :                     continue;   /* continue with the next tuple */
    4286             :                 }
    4287             : 
    4288           0 :                 elog(ERROR, "tableoid is NULL");
    4289             :             }
    4290        4652 :             resultoid = DatumGetObjectId(datum);
    4291             : 
    4292             :             /* If it's not the same as last time, we need to locate the rel */
    4293        4652 :             if (resultoid != node->mt_lastResultOid)
    4294        3178 :                 resultRelInfo = ExecLookupResultRelByOid(node, resultoid,
    4295             :                                                          false, true);
    4296             :         }
    4297             : 
    4298             :         /*
    4299             :          * If resultRelInfo->ri_usesFdwDirectModify is true, all we need to do
    4300             :          * here is compute the RETURNING expressions.
    4301             :          */
    4302    14133184 :         if (resultRelInfo->ri_usesFdwDirectModify)
    4303             :         {
    4304             :             Assert(resultRelInfo->ri_projectReturning);
    4305             : 
    4306             :             /*
    4307             :              * A scan slot containing the data that was actually inserted,
    4308             :              * updated or deleted has already been made available to
    4309             :              * ExecProcessReturning by IterateDirectModify, so no need to
    4310             :              * provide it here.  The individual old and new slots are not
    4311             :              * needed, since direct-modify is disabled if the RETURNING list
    4312             :              * refers to OLD/NEW values.
    4313             :              */
    4314             :             Assert((resultRelInfo->ri_projectReturning->pi_state.flags & EEO_FLAG_HAS_OLD) == 0 &&
    4315             :                    (resultRelInfo->ri_projectReturning->pi_state.flags & EEO_FLAG_HAS_NEW) == 0);
    4316             : 
    4317         694 :             slot = ExecProcessReturning(&context, resultRelInfo, operation,
    4318             :                                         NULL, NULL, context.planSlot);
    4319             : 
    4320         694 :             return slot;
    4321             :         }
    4322             : 
    4323    14132490 :         EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
    4324    14132490 :         slot = context.planSlot;
    4325             : 
    4326    14132490 :         tupleid = NULL;
    4327    14132490 :         oldtuple = NULL;
    4328             : 
    4329             :         /*
    4330             :          * For UPDATE/DELETE/MERGE, fetch the row identity info for the tuple
    4331             :          * to be updated/deleted/merged.  For a heap relation, that's a TID;
    4332             :          * otherwise we may have a wholerow junk attr that carries the old
    4333             :          * tuple in toto.  Keep this in step with the part of
    4334             :          * ExecInitModifyTable that sets up ri_RowIdAttNo.
    4335             :          */
    4336    14132490 :         if (operation == CMD_UPDATE || operation == CMD_DELETE ||
    4337             :             operation == CMD_MERGE)
    4338             :         {
    4339             :             char        relkind;
    4340             :             Datum       datum;
    4341             :             bool        isNull;
    4342             : 
    4343     1976150 :             relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
    4344     1976150 :             if (relkind == RELKIND_RELATION ||
    4345         562 :                 relkind == RELKIND_MATVIEW ||
    4346             :                 relkind == RELKIND_PARTITIONED_TABLE)
    4347             :             {
    4348             :                 /* ri_RowIdAttNo refers to a ctid attribute */
    4349             :                 Assert(AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo));
    4350     1975594 :                 datum = ExecGetJunkAttribute(slot,
    4351     1975594 :                                              resultRelInfo->ri_RowIdAttNo,
    4352             :                                              &isNull);
    4353             : 
    4354             :                 /*
    4355             :                  * For commands other than MERGE, any tuples having a null row
    4356             :                  * identifier are errors.  For MERGE, we may need to handle
    4357             :                  * them as WHEN NOT MATCHED clauses if any, so do that.
    4358             :                  *
    4359             :                  * Note that we use the node's toplevel resultRelInfo, not any
    4360             :                  * specific partition's.
    4361             :                  */
    4362     1975594 :                 if (isNull)
    4363             :                 {
    4364        2116 :                     if (operation == CMD_MERGE)
    4365             :                     {
    4366        2116 :                         EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
    4367             : 
    4368        2116 :                         slot = ExecMerge(&context, node->resultRelInfo,
    4369        2116 :                                          NULL, NULL, node->canSetTag);
    4370             : 
    4371             :                         /*
    4372             :                          * If we got a RETURNING result, return it to the
    4373             :                          * caller.  We'll continue the work on next call.
    4374             :                          */
    4375        2074 :                         if (slot)
    4376         120 :                             return slot;
    4377             : 
    4378        1996 :                         continue;   /* continue with the next tuple */
    4379             :                     }
    4380             : 
    4381           0 :                     elog(ERROR, "ctid is NULL");
    4382             :                 }
    4383             : 
    4384     1973478 :                 tupleid = (ItemPointer) DatumGetPointer(datum);
    4385     1973478 :                 tuple_ctid = *tupleid;  /* be sure we don't free ctid!! */
    4386     1973478 :                 tupleid = &tuple_ctid;
    4387             :             }
    4388             : 
    4389             :             /*
    4390             :              * Use the wholerow attribute, when available, to reconstruct the
    4391             :              * old relation tuple.  The old tuple serves one or both of two
    4392             :              * purposes: 1) it serves as the OLD tuple for row triggers, 2) it
    4393             :              * provides values for any unchanged columns for the NEW tuple of
    4394             :              * an UPDATE, because the subplan does not produce all the columns
    4395             :              * of the target table.
    4396             :              *
    4397             :              * Note that the wholerow attribute does not carry system columns,
    4398             :              * so foreign table triggers miss seeing those, except that we
    4399             :              * know enough here to set t_tableOid.  Quite separately from
    4400             :              * this, the FDW may fetch its own junk attrs to identify the row.
    4401             :              *
    4402             :              * Other relevant relkinds, currently limited to views, always
    4403             :              * have a wholerow attribute.
    4404             :              */
    4405         556 :             else if (AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
    4406             :             {
    4407         530 :                 datum = ExecGetJunkAttribute(slot,
    4408         530 :                                              resultRelInfo->ri_RowIdAttNo,
    4409             :                                              &isNull);
    4410             : 
    4411             :                 /*
    4412             :                  * For commands other than MERGE, any tuples having a null row
    4413             :                  * identifier are errors.  For MERGE, we may need to handle
    4414             :                  * them as WHEN NOT MATCHED clauses if any, so do that.
    4415             :                  *
    4416             :                  * Note that we use the node's toplevel resultRelInfo, not any
    4417             :                  * specific partition's.
    4418             :                  */
    4419         530 :                 if (isNull)
    4420             :                 {
    4421          48 :                     if (operation == CMD_MERGE)
    4422             :                     {
    4423          48 :                         EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
    4424             : 
    4425          48 :                         slot = ExecMerge(&context, node->resultRelInfo,
    4426          48 :                                          NULL, NULL, node->canSetTag);
    4427             : 
    4428             :                         /*
    4429             :                          * If we got a RETURNING result, return it to the
    4430             :                          * caller.  We'll continue the work on next call.
    4431             :                          */
    4432          42 :                         if (slot)
    4433          12 :                             return slot;
    4434             : 
    4435          30 :                         continue;   /* continue with the next tuple */
    4436             :                     }
    4437             : 
    4438           0 :                     elog(ERROR, "wholerow is NULL");
    4439             :                 }
    4440             : 
    4441         482 :                 oldtupdata.t_data = DatumGetHeapTupleHeader(datum);
    4442         482 :                 oldtupdata.t_len =
    4443         482 :                     HeapTupleHeaderGetDatumLength(oldtupdata.t_data);
    4444         482 :                 ItemPointerSetInvalid(&(oldtupdata.t_self));
    4445             :                 /* Historically, view triggers see invalid t_tableOid. */
    4446         482 :                 oldtupdata.t_tableOid =
    4447         482 :                     (relkind == RELKIND_VIEW) ? InvalidOid :
    4448         206 :                     RelationGetRelid(resultRelInfo->ri_RelationDesc);
    4449             : 
    4450         482 :                 oldtuple = &oldtupdata;
    4451             :             }
    4452             :             else
    4453             :             {
    4454             :                 /* Only foreign tables are allowed to omit a row-ID attr */
    4455             :                 Assert(relkind == RELKIND_FOREIGN_TABLE);
    4456             :             }
    4457             :         }
    4458             : 
    4459    14130326 :         switch (operation)
    4460             :         {
    4461    12156340 :             case CMD_INSERT:
    4462             :                 /* Initialize projection info if first time for this table */
    4463    12156340 :                 if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
    4464       85980 :                     ExecInitInsertProjection(node, resultRelInfo);
    4465    12156340 :                 slot = ExecGetInsertNewTuple(resultRelInfo, context.planSlot);
    4466    12156340 :                 slot = ExecInsert(&context, resultRelInfo, slot,
    4467    12156340 :                                   node->canSetTag, NULL, NULL);
    4468    12154238 :                 break;
    4469             : 
    4470      317176 :             case CMD_UPDATE:
    4471      317176 :                 tuplock = false;
    4472             : 
    4473             :                 /* Initialize projection info if first time for this table */
    4474      317176 :                 if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
    4475       13184 :                     ExecInitUpdateProjection(node, resultRelInfo);
    4476             : 
    4477             :                 /*
    4478             :                  * Make the new tuple by combining plan's output tuple with
    4479             :                  * the old tuple being updated.
    4480             :                  */
    4481      317176 :                 oldSlot = resultRelInfo->ri_oldTupleSlot;
    4482      317176 :                 if (oldtuple != NULL)
    4483             :                 {
    4484             :                     Assert(!resultRelInfo->ri_needLockTagTuple);
    4485             :                     /* Use the wholerow junk attr as the old tuple. */
    4486         314 :                     ExecForceStoreHeapTuple(oldtuple, oldSlot, false);
    4487             :                 }
    4488             :                 else
    4489             :                 {
    4490             :                     /* Fetch the most recent version of old tuple. */
    4491      316862 :                     Relation    relation = resultRelInfo->ri_RelationDesc;
    4492             : 
    4493      316862 :                     if (resultRelInfo->ri_needLockTagTuple)
    4494             :                     {
    4495       24670 :                         LockTuple(relation, tupleid, InplaceUpdateTupleLock);
    4496       24670 :                         tuplock = true;
    4497             :                     }
    4498      316862 :                     if (!table_tuple_fetch_row_version(relation, tupleid,
    4499             :                                                        SnapshotAny,
    4500             :                                                        oldSlot))
    4501           0 :                         elog(ERROR, "failed to fetch tuple being updated");
    4502             :                 }
    4503      317176 :                 slot = ExecGetUpdateNewTuple(resultRelInfo, context.planSlot,
    4504             :                                              oldSlot);
    4505             : 
    4506             :                 /* Now apply the update. */
    4507      317176 :                 slot = ExecUpdate(&context, resultRelInfo, tupleid, oldtuple,
    4508      317176 :                                   oldSlot, slot, node->canSetTag);
    4509      316676 :                 if (tuplock)
    4510       24670 :                     UnlockTuple(resultRelInfo->ri_RelationDesc, tupleid,
    4511             :                                 InplaceUpdateTupleLock);
    4512      316676 :                 break;
    4513             : 
    4514     1644492 :             case CMD_DELETE:
    4515     1644492 :                 slot = ExecDelete(&context, resultRelInfo, tupleid, oldtuple,
    4516     1644492 :                                   true, false, node->canSetTag, NULL, NULL, NULL);
    4517     1644428 :                 break;
    4518             : 
    4519       12318 :             case CMD_MERGE:
    4520       12318 :                 slot = ExecMerge(&context, resultRelInfo, tupleid, oldtuple,
    4521       12318 :                                  node->canSetTag);
    4522       12228 :                 break;
    4523             : 
    4524           0 :             default:
    4525           0 :                 elog(ERROR, "unknown operation");
    4526             :                 break;
    4527             :         }
    4528             : 
    4529             :         /*
    4530             :          * If we got a RETURNING result, return it to caller.  We'll continue
    4531             :          * the work on next call.
    4532             :          */
    4533    14127570 :         if (slot)
    4534        7206 :             return slot;
    4535             :     }
    4536             : 
    4537             :     /*
    4538             :      * Insert remaining tuples for batch insert.
    4539             :      */
    4540      110838 :     if (estate->es_insert_pending_result_relations != NIL)
    4541          24 :         ExecPendingInserts(estate);
    4542             : 
    4543             :     /*
    4544             :      * We're done, but fire AFTER STATEMENT triggers before exiting.
    4545             :      */
    4546      110838 :     fireASTriggers(node);
    4547             : 
    4548      110838 :     node->mt_done = true;
    4549             : 
    4550      110838 :     return NULL;
    4551             : }
    4552             : 
    4553             : /*
    4554             :  * ExecLookupResultRelByOid
    4555             :  *      If the table with given OID is among the result relations to be
    4556             :  *      updated by the given ModifyTable node, return its ResultRelInfo.
    4557             :  *
    4558             :  * If not found, return NULL if missing_ok, else raise error.
    4559             :  *
    4560             :  * If update_cache is true, then upon successful lookup, update the node's
    4561             :  * one-element cache.  ONLY ExecModifyTable may pass true for this.
    4562             :  */
    4563             : ResultRelInfo *
    4564        9952 : ExecLookupResultRelByOid(ModifyTableState *node, Oid resultoid,
    4565             :                          bool missing_ok, bool update_cache)
    4566             : {
    4567        9952 :     if (node->mt_resultOidHash)
    4568             :     {
    4569             :         /* Use the pre-built hash table to locate the rel */
    4570             :         MTTargetRelLookup *mtlookup;
    4571             : 
    4572             :         mtlookup = (MTTargetRelLookup *)
    4573           0 :             hash_search(node->mt_resultOidHash, &resultoid, HASH_FIND, NULL);
    4574           0 :         if (mtlookup)
    4575             :         {
    4576           0 :             if (update_cache)
    4577             :             {
    4578           0 :                 node->mt_lastResultOid = resultoid;
    4579           0 :                 node->mt_lastResultIndex = mtlookup->relationIndex;
    4580             :             }
    4581           0 :             return node->resultRelInfo + mtlookup->relationIndex;
    4582             :         }
    4583             :     }
    4584             :     else
    4585             :     {
    4586             :         /* With few target rels, just search the ResultRelInfo array */
    4587       18768 :         for (int ndx = 0; ndx < node->mt_nrels; ndx++)
    4588             :         {
    4589       12494 :             ResultRelInfo *rInfo = node->resultRelInfo + ndx;
    4590             : 
    4591       12494 :             if (RelationGetRelid(rInfo->ri_RelationDesc) == resultoid)
    4592             :             {
    4593        3678 :                 if (update_cache)
    4594             :                 {
    4595        3178 :                     node->mt_lastResultOid = resultoid;
    4596        3178 :                     node->mt_lastResultIndex = ndx;
    4597             :                 }
    4598        3678 :                 return rInfo;
    4599             :             }
    4600             :         }
    4601             :     }
    4602             : 
    4603        6274 :     if (!missing_ok)
    4604           0 :         elog(ERROR, "incorrect result relation OID %u", resultoid);
    4605        6274 :     return NULL;
    4606             : }
    4607             : 
    4608             : /* ----------------------------------------------------------------
    4609             :  *      ExecInitModifyTable
    4610             :  * ----------------------------------------------------------------
    4611             :  */
    4612             : ModifyTableState *
    4613      115464 : ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags)
    4614             : {
    4615             :     ModifyTableState *mtstate;
    4616      115464 :     Plan       *subplan = outerPlan(node);
    4617      115464 :     CmdType     operation = node->operation;
    4618      115464 :     int         total_nrels = list_length(node->resultRelations);
    4619             :     int         nrels;
    4620      115464 :     List       *resultRelations = NIL;
    4621      115464 :     List       *withCheckOptionLists = NIL;
    4622      115464 :     List       *returningLists = NIL;
    4623      115464 :     List       *updateColnosLists = NIL;
    4624      115464 :     List       *mergeActionLists = NIL;
    4625      115464 :     List       *mergeJoinConditions = NIL;
    4626             :     ResultRelInfo *resultRelInfo;
    4627             :     List       *arowmarks;
    4628             :     ListCell   *l;
    4629             :     int         i;
    4630             :     Relation    rel;
    4631             : 
    4632             :     /* check for unsupported flags */
    4633             :     Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
    4634             : 
    4635             :     /*
    4636             :      * Only consider unpruned relations for initializing their ResultRelInfo
    4637             :      * struct and other fields such as withCheckOptions, etc.
    4638             :      *
    4639             :      * Note: We must avoid pruning every result relation.  This is important
    4640             :      * for MERGE, since even if every result relation is pruned from the
    4641             :      * subplan, there might still be NOT MATCHED rows, for which there may be
    4642             :      * INSERT actions to perform.  To allow these actions to be found, at
    4643             :      * least one result relation must be kept.  Also, when inserting into a
    4644             :      * partitioned table, ExecInitPartitionInfo() needs a ResultRelInfo struct
    4645             :      * as a reference for building the ResultRelInfo of the target partition.
    4646             :      * In either case, it doesn't matter which result relation is kept, so we
    4647             :      * just keep the first one, if all others have been pruned.  See also,
    4648             :      * ExecDoInitialPruning(), which ensures that this first result relation
    4649             :      * has been locked.
    4650             :      */
    4651      115464 :     i = 0;
    4652      233422 :     foreach(l, node->resultRelations)
    4653             :     {
    4654      117958 :         Index       rti = lfirst_int(l);
    4655             :         bool        keep_rel;
    4656             : 
    4657      117958 :         keep_rel = bms_is_member(rti, estate->es_unpruned_relids);
    4658      117958 :         if (!keep_rel && i == total_nrels - 1 && resultRelations == NIL)
    4659             :         {
    4660             :             /* all result relations pruned; keep the first one */
    4661          48 :             keep_rel = true;
    4662          48 :             rti = linitial_int(node->resultRelations);
    4663          48 :             i = 0;
    4664             :         }
    4665             : 
    4666      117958 :         if (keep_rel)
    4667             :         {
    4668      117874 :             resultRelations = lappend_int(resultRelations, rti);
    4669      117874 :             if (node->withCheckOptionLists)
    4670             :             {
    4671        1430 :                 List       *withCheckOptions = list_nth_node(List,
    4672             :                                                              node->withCheckOptionLists,
    4673             :                                                              i);
    4674             : 
    4675        1430 :                 withCheckOptionLists = lappend(withCheckOptionLists, withCheckOptions);
    4676             :             }
    4677      117874 :             if (node->returningLists)
    4678             :             {
    4679        5022 :                 List       *returningList = list_nth_node(List,
    4680             :                                                           node->returningLists,
    4681             :                                                           i);
    4682             : 
    4683        5022 :                 returningLists = lappend(returningLists, returningList);
    4684             :             }
    4685      117874 :             if (node->updateColnosLists)
    4686             :             {
    4687       15888 :                 List       *updateColnosList = list_nth(node->updateColnosLists, i);
    4688             : 
    4689       15888 :                 updateColnosLists = lappend(updateColnosLists, updateColnosList);
    4690             :             }
    4691      117874 :             if (node->mergeActionLists)
    4692             :             {
    4693        1766 :                 List       *mergeActionList = list_nth(node->mergeActionLists, i);
    4694             : 
    4695        1766 :                 mergeActionLists = lappend(mergeActionLists, mergeActionList);
    4696             :             }
    4697      117874 :             if (node->mergeJoinConditions)
    4698             :             {
    4699        1766 :                 List       *mergeJoinCondition = list_nth(node->mergeJoinConditions, i);
    4700             : 
    4701        1766 :                 mergeJoinConditions = lappend(mergeJoinConditions, mergeJoinCondition);
    4702             :             }
    4703             :         }
    4704      117958 :         i++;
    4705             :     }
    4706      115464 :     nrels = list_length(resultRelations);
    4707             :     Assert(nrels > 0);
    4708             : 
    4709             :     /*
    4710             :      * create state structure
    4711             :      */
    4712      115464 :     mtstate = makeNode(ModifyTableState);
    4713      115464 :     mtstate->ps.plan = (Plan *) node;
    4714      115464 :     mtstate->ps.state = estate;
    4715      115464 :     mtstate->ps.ExecProcNode = ExecModifyTable;
    4716             : 
    4717      115464 :     mtstate->operation = operation;
    4718      115464 :     mtstate->canSetTag = node->canSetTag;
    4719      115464 :     mtstate->mt_done = false;
    4720             : 
    4721      115464 :     mtstate->mt_nrels = nrels;
    4722      115464 :     mtstate->resultRelInfo = (ResultRelInfo *)
    4723      115464 :         palloc(nrels * sizeof(ResultRelInfo));
    4724             : 
    4725      115464 :     mtstate->mt_merge_pending_not_matched = NULL;
    4726      115464 :     mtstate->mt_merge_inserted = 0;
    4727      115464 :     mtstate->mt_merge_updated = 0;
    4728      115464 :     mtstate->mt_merge_deleted = 0;
    4729      115464 :     mtstate->mt_updateColnosLists = updateColnosLists;
    4730      115464 :     mtstate->mt_mergeActionLists = mergeActionLists;
    4731      115464 :     mtstate->mt_mergeJoinConditions = mergeJoinConditions;
    4732             : 
    4733             :     /*----------
    4734             :      * Resolve the target relation. This is the same as:
    4735             :      *
    4736             :      * - the relation for which we will fire FOR STATEMENT triggers,
    4737             :      * - the relation into whose tuple format all captured transition tuples
    4738             :      *   must be converted, and
    4739             :      * - the root partitioned table used for tuple routing.
    4740             :      *
    4741             :      * If it's a partitioned or inherited table, the root partition or
    4742             :      * appendrel RTE doesn't appear elsewhere in the plan and its RT index is
    4743             :      * given explicitly in node->rootRelation.  Otherwise, the target relation
    4744             :      * is the sole relation in the node->resultRelations list and, since it can
    4745             :      * never be pruned, also in the resultRelations list constructed above.
    4746             :      *----------
    4747             :      */
    4748      115464 :     if (node->rootRelation > 0)
    4749             :     {
    4750             :         Assert(bms_is_member(node->rootRelation, estate->es_unpruned_relids));
    4751        2852 :         mtstate->rootResultRelInfo = makeNode(ResultRelInfo);
    4752        2852 :         ExecInitResultRelation(estate, mtstate->rootResultRelInfo,
    4753             :                                node->rootRelation);
    4754             :     }
    4755             :     else
    4756             :     {
    4757             :         Assert(list_length(node->resultRelations) == 1);
    4758             :         Assert(list_length(resultRelations) == 1);
    4759      112612 :         mtstate->rootResultRelInfo = mtstate->resultRelInfo;
    4760      112612 :         ExecInitResultRelation(estate, mtstate->resultRelInfo,
    4761      112612 :                                linitial_int(resultRelations));
    4762             :     }
    4763             : 
    4764             :     /* set up epqstate with dummy subplan data for the moment */
    4765      115464 :     EvalPlanQualInit(&mtstate->mt_epqstate, estate, NULL, NIL,
    4766             :                      node->epqParam, resultRelations);
    4767      115464 :     mtstate->fireBSTriggers = true;
    4768             : 
    4769             :     /*
    4770             :      * Build state for collecting transition tuples.  This requires having a
    4771             :      * valid trigger query context, so skip it in explain-only mode.
    4772             :      */
    4773      115464 :     if (!(eflags & EXEC_FLAG_EXPLAIN_ONLY))
    4774      114438 :         ExecSetupTransitionCaptureState(mtstate, estate);
    4775             : 
    4776             :     /*
    4777             :      * Open all the result relations and initialize the ResultRelInfo structs.
    4778             :      * (But root relation was initialized above, if it's part of the array.)
    4779             :      * We must do this before initializing the subplan, because direct-modify
    4780             :      * FDWs expect their ResultRelInfos to be available.
    4781             :      */
    4782      115464 :     resultRelInfo = mtstate->resultRelInfo;
    4783      115464 :     i = 0;
    4784      233014 :     foreach(l, resultRelations)
    4785             :     {
    4786      117868 :         Index       resultRelation = lfirst_int(l);
    4787      117868 :         List       *mergeActions = NIL;
    4788             : 
    4789      117868 :         if (mergeActionLists)
    4790        1766 :             mergeActions = list_nth(mergeActionLists, i);
    4791             : 
    4792      117868 :         if (resultRelInfo != mtstate->rootResultRelInfo)
    4793             :         {
    4794        5256 :             ExecInitResultRelation(estate, resultRelInfo, resultRelation);
    4795             : 
    4796             :             /*
    4797             :              * For child result relations, store the root result relation
    4798             :              * pointer.  We do so for the convenience of places that want to
    4799             :              * look at the query's original target relation but don't have the
    4800             :              * mtstate handy.
    4801             :              */
    4802        5256 :             resultRelInfo->ri_RootResultRelInfo = mtstate->rootResultRelInfo;
    4803             :         }
    4804             : 
    4805             :         /* Initialize the usesFdwDirectModify flag */
    4806      117868 :         resultRelInfo->ri_usesFdwDirectModify =
    4807      117868 :             bms_is_member(i, node->fdwDirectModifyPlans);
    4808             : 
    4809             :         /*
    4810             :          * Verify result relation is a valid target for the current operation
    4811             :          */
    4812      117868 :         CheckValidResultRel(resultRelInfo, operation, mergeActions);
    4813             : 
    4814      117550 :         resultRelInfo++;
    4815      117550 :         i++;
    4816             :     }
    4817             : 
    4818             :     /*
    4819             :      * Now we may initialize the subplan.
    4820             :      */
    4821      115146 :     outerPlanState(mtstate) = ExecInitNode(subplan, estate, eflags);
    4822             : 
    4823             :     /*
    4824             :      * Do additional per-result-relation initialization.
    4825             :      */
    4826      232662 :     for (i = 0; i < nrels; i++)
    4827             :     {
    4828      117516 :         resultRelInfo = &mtstate->resultRelInfo[i];
    4829             : 
    4830             :         /* Let FDWs init themselves for foreign-table result rels */
    4831      117516 :         if (!resultRelInfo->ri_usesFdwDirectModify &&
    4832      117308 :             resultRelInfo->ri_FdwRoutine != NULL &&
    4833         322 :             resultRelInfo->ri_FdwRoutine->BeginForeignModify != NULL)
    4834             :         {
    4835         322 :             List       *fdw_private = (List *) list_nth(node->fdwPrivLists, i);
    4836             : 
    4837         322 :             resultRelInfo->ri_FdwRoutine->BeginForeignModify(mtstate,
    4838             :                                                              resultRelInfo,
    4839             :                                                              fdw_private,
    4840             :                                                              i,
    4841             :                                                              eflags);
    4842             :         }
    4843             : 
    4844             :         /*
    4845             :          * For UPDATE/DELETE/MERGE, find the appropriate junk attr now, either
    4846             :          * a 'ctid' or 'wholerow' attribute depending on relkind.  For foreign
    4847             :          * tables, the FDW might have created additional junk attr(s), but
    4848             :          * those are no concern of ours.
    4849             :          */
    4850      117516 :         if (operation == CMD_UPDATE || operation == CMD_DELETE ||
    4851             :             operation == CMD_MERGE)
    4852             :         {
    4853             :             char        relkind;
    4854             : 
    4855       30088 :             relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
    4856       30088 :             if (relkind == RELKIND_RELATION ||
    4857         680 :                 relkind == RELKIND_MATVIEW ||
    4858             :                 relkind == RELKIND_PARTITIONED_TABLE)
    4859             :             {
    4860       29444 :                 resultRelInfo->ri_RowIdAttNo =
    4861       29444 :                     ExecFindJunkAttributeInTlist(subplan->targetlist, "ctid");
    4862       29444 :                 if (!AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
    4863           0 :                     elog(ERROR, "could not find junk ctid column");
    4864             :             }
    4865         644 :             else if (relkind == RELKIND_FOREIGN_TABLE)
    4866             :             {
    4867             :                 /*
    4868             :                  * We don't support MERGE with foreign tables for now.  (It's
    4869             :                  * problematic because the implementation uses CTID.)
    4870             :                  */
    4871             :                 Assert(operation != CMD_MERGE);
    4872             : 
    4873             :                 /*
    4874             :                  * When there is a row-level trigger, there should be a
    4875             :                  * wholerow attribute.  We also require it to be present in
    4876             :                  * UPDATE and MERGE, so we can get the values of unchanged
    4877             :                  * columns.
    4878             :                  */
    4879         356 :                 resultRelInfo->ri_RowIdAttNo =
    4880         356 :                     ExecFindJunkAttributeInTlist(subplan->targetlist,
    4881             :                                                  "wholerow");
    4882         356 :                 if ((mtstate->operation == CMD_UPDATE || mtstate->operation == CMD_MERGE) &&
    4883         202 :                     !AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
    4884           0 :                     elog(ERROR, "could not find junk wholerow column");
    4885             :             }
    4886             :             else
    4887             :             {
    4888             :                 /* Other valid target relkinds must provide wholerow */
    4889         288 :                 resultRelInfo->ri_RowIdAttNo =
    4890         288 :                     ExecFindJunkAttributeInTlist(subplan->targetlist,
    4891             :                                                  "wholerow");
    4892         288 :                 if (!AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
    4893           0 :                     elog(ERROR, "could not find junk wholerow column");
    4894             :             }
    4895             :         }
    4896             :     }
    4897             : 
    4898             :     /*
    4899             :      * If this is an inherited update/delete/merge, there will be a junk
    4900             :      * attribute named "tableoid" present in the subplan's targetlist.  It
    4901             :      * will be used to identify the result relation for a given tuple to be
    4902             :      * updated/deleted/merged.
    4903             :      */
    4904      115146 :     mtstate->mt_resultOidAttno =
    4905      115146 :         ExecFindJunkAttributeInTlist(subplan->targetlist, "tableoid");
    4906             :     Assert(AttributeNumberIsValid(mtstate->mt_resultOidAttno) || total_nrels == 1);
    4907      115146 :     mtstate->mt_lastResultOid = InvalidOid; /* force lookup at first tuple */
    4908      115146 :     mtstate->mt_lastResultIndex = 0; /* must be zero if no such attr */
    4909             : 
    4910             :     /* Get the root target relation */
    4911      115146 :     rel = mtstate->rootResultRelInfo->ri_RelationDesc;
    4912             : 
    4913             :     /*
    4914             :      * Build state for tuple routing if it's a partitioned INSERT.  An UPDATE
    4915             :      * or MERGE might need this too, but only if it actually moves tuples
    4916             :      * between partitions; in that case setup is done by
    4917             :      * ExecCrossPartitionUpdate.
    4918             :      */
    4919      115146 :     if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
    4920             :         operation == CMD_INSERT)
    4921        3898 :         mtstate->mt_partition_tuple_routing =
    4922        3898 :             ExecSetupPartitionTupleRouting(estate, rel);
    4923             : 
    4924             :     /*
    4925             :      * Initialize any WITH CHECK OPTION constraints if needed.
    4926             :      */
    4927      115146 :     resultRelInfo = mtstate->resultRelInfo;
    4928      116576 :     foreach(l, withCheckOptionLists)
    4929             :     {
    4930        1430 :         List       *wcoList = (List *) lfirst(l);
    4931        1430 :         List       *wcoExprs = NIL;
    4932             :         ListCell   *ll;
    4933             : 
    4934        3914 :         foreach(ll, wcoList)
    4935             :         {
    4936        2484 :             WithCheckOption *wco = (WithCheckOption *) lfirst(ll);
    4937        2484 :             ExprState  *wcoExpr = ExecInitQual((List *) wco->qual,
    4938             :                                                &mtstate->ps);
    4939             : 
    4940        2484 :             wcoExprs = lappend(wcoExprs, wcoExpr);
    4941             :         }
    4942             : 
    4943        1430 :         resultRelInfo->ri_WithCheckOptions = wcoList;
    4944        1430 :         resultRelInfo->ri_WithCheckOptionExprs = wcoExprs;
    4945        1430 :         resultRelInfo++;
    4946             :     }
    4947             : 
    4948             :     /*
    4949             :      * Initialize RETURNING projections if needed.
    4950             :      */
    4951      115146 :     if (returningLists)
    4952             :     {
    4953             :         TupleTableSlot *slot;
    4954             :         ExprContext *econtext;
    4955             : 
    4956             :         /*
    4957             :          * Initialize result tuple slot and assign its rowtype using the plan
    4958             :          * node's declared targetlist, which the planner set up to be the same
    4959             :          * as the first (before runtime pruning) RETURNING list.  We assume
    4960             :          * all the result rels will produce compatible output.
    4961             :          */
    4962        4676 :         ExecInitResultTupleSlotTL(&mtstate->ps, &TTSOpsVirtual);
    4963        4676 :         slot = mtstate->ps.ps_ResultTupleSlot;
    4964             : 
    4965             :         /* Need an econtext too */
    4966        4676 :         if (mtstate->ps.ps_ExprContext == NULL)
    4967        4676 :             ExecAssignExprContext(estate, &mtstate->ps);
    4968        4676 :         econtext = mtstate->ps.ps_ExprContext;
    4969             : 
    4970             :         /*
    4971             :          * Build a projection for each result rel.
    4972             :          */
    4973        4676 :         resultRelInfo = mtstate->resultRelInfo;
    4974        9698 :         foreach(l, returningLists)
    4975             :         {
    4976        5022 :             List       *rlist = (List *) lfirst(l);
    4977             : 
    4978        5022 :             resultRelInfo->ri_returningList = rlist;
    4979        5022 :             resultRelInfo->ri_projectReturning =
    4980        5022 :                 ExecBuildProjectionInfo(rlist, econtext, slot, &mtstate->ps,
    4981        5022 :                                         resultRelInfo->ri_RelationDesc->rd_att);
    4982        5022 :             resultRelInfo++;
    4983             :         }
    4984             :     }
    4985             :     else
    4986             :     {
    4987             :         /*
    4988             :          * We still must construct a dummy result tuple type, because InitPlan
    4989             :          * expects one (maybe should change that?).
    4990             :          */
    4991      110470 :         ExecInitResultTypeTL(&mtstate->ps);
    4992             : 
    4993      110470 :         mtstate->ps.ps_ExprContext = NULL;
    4994             :     }
    4995             : 
    4996             :     /* Set the list of arbiter indexes if needed for ON CONFLICT */
    4997      115146 :     resultRelInfo = mtstate->resultRelInfo;
    4998      115146 :     if (node->onConflictAction != ONCONFLICT_NONE)
    4999             :     {
    5000             :         /* insert may only have one relation, inheritance is not expanded */
    5001             :         Assert(total_nrels == 1);
    5002        1356 :         resultRelInfo->ri_onConflictArbiterIndexes = node->arbiterIndexes;
    5003             :     }
    5004             : 
    5005             :     /*
    5006             :      * If needed, Initialize target list, projection and qual for ON CONFLICT
    5007             :      * DO UPDATE.
    5008             :      */
    5009      115146 :     if (node->onConflictAction == ONCONFLICT_UPDATE)
    5010             :     {
    5011         912 :         OnConflictSetState *onconfl = makeNode(OnConflictSetState);
    5012             :         ExprContext *econtext;
    5013             :         TupleDesc   relationDesc;
    5014             : 
    5015             :         /* already exists if created by RETURNING processing above */
    5016         912 :         if (mtstate->ps.ps_ExprContext == NULL)
    5017         632 :             ExecAssignExprContext(estate, &mtstate->ps);
    5018             : 
    5019         912 :         econtext = mtstate->ps.ps_ExprContext;
    5020         912 :         relationDesc = resultRelInfo->ri_RelationDesc->rd_att;
    5021             : 
    5022             :         /* create state for DO UPDATE SET operation */
    5023         912 :         resultRelInfo->ri_onConflict = onconfl;
    5024             : 
    5025             :         /* initialize slot for the existing tuple */
    5026         912 :         onconfl->oc_Existing =
    5027         912 :             table_slot_create(resultRelInfo->ri_RelationDesc,
    5028         912 :                               &mtstate->ps.state->es_tupleTable);
    5029             : 
    5030             :         /*
    5031             :          * Create the tuple slot for the UPDATE SET projection. We want a slot
    5032             :          * of the table's type here, because the slot will be used to insert
    5033             :          * into the table, and for RETURNING processing - which may access
    5034             :          * system attributes.
    5035             :          */
    5036         912 :         onconfl->oc_ProjSlot =
    5037         912 :             table_slot_create(resultRelInfo->ri_RelationDesc,
    5038         912 :                               &mtstate->ps.state->es_tupleTable);
    5039             : 
    5040             :         /* build UPDATE SET projection state */
    5041         912 :         onconfl->oc_ProjInfo =
    5042         912 :             ExecBuildUpdateProjection(node->onConflictSet,
    5043             :                                       true,
    5044             :                                       node->onConflictCols,
    5045             :                                       relationDesc,
    5046             :                                       econtext,
    5047             :                                       onconfl->oc_ProjSlot,
    5048             :                                       &mtstate->ps);
    5049             : 
    5050             :         /* initialize state to evaluate the WHERE clause, if any */
    5051         912 :         if (node->onConflictWhere)
    5052             :         {
    5053             :             ExprState  *qualexpr;
    5054             : 
    5055         176 :             qualexpr = ExecInitQual((List *) node->onConflictWhere,
    5056             :                                     &mtstate->ps);
    5057         176 :             onconfl->oc_WhereClause = qualexpr;
    5058             :         }
    5059             :     }
    5060             : 
    5061             :     /*
    5062             :      * If we have any secondary relations in an UPDATE or DELETE, they need to
    5063             :      * be treated like non-locked relations in SELECT FOR UPDATE, i.e., the
    5064             :      * EvalPlanQual mechanism needs to be told about them.  This also goes for
    5065             :      * the source relations in a MERGE.  Locate the relevant ExecRowMarks.
    5066             :      */
    5067      115146 :     arowmarks = NIL;
    5068      117956 :     foreach(l, node->rowMarks)
    5069             :     {
    5070        2810 :         PlanRowMark *rc = lfirst_node(PlanRowMark, l);
    5071             :         ExecRowMark *erm;
    5072             :         ExecAuxRowMark *aerm;
    5073             : 
    5074             :         /*
    5075             :          * Ignore "parent" rowmarks, because they are irrelevant at runtime.
    5076             :          * Also ignore the rowmarks belonging to child tables that have been
    5077             :          * pruned in ExecDoInitialPruning().
    5078             :          */
    5079        2810 :         if (rc->isParent ||
    5080        2668 :             !bms_is_member(rc->rti, estate->es_unpruned_relids))
    5081         596 :             continue;
    5082             : 
    5083             :         /* Find ExecRowMark and build ExecAuxRowMark */
    5084        2214 :         erm = ExecFindRowMark(estate, rc->rti, false);
    5085        2214 :         aerm = ExecBuildAuxRowMark(erm, subplan->targetlist);
    5086        2214 :         arowmarks = lappend(arowmarks, aerm);
    5087             :     }
    5088             : 
    5089             :     /* For a MERGE command, initialize its state */
    5090      115146 :     if (mtstate->operation == CMD_MERGE)
    5091        1534 :         ExecInitMerge(mtstate, estate);
    5092             : 
    5093      115146 :     EvalPlanQualSetPlan(&mtstate->mt_epqstate, subplan, arowmarks);
    5094             : 
    5095             :     /*
    5096             :      * If there are a lot of result relations, use a hash table to speed the
    5097             :      * lookups.  If there are not a lot, a simple linear search is faster.
    5098             :      *
    5099             :      * It's not clear where the threshold is, but try 64 for starters.  In a
    5100             :      * debugging build, use a small threshold so that we get some test
    5101             :      * coverage of both code paths.
    5102             :      */
    5103             : #ifdef USE_ASSERT_CHECKING
    5104             : #define MT_NRELS_HASH 4
    5105             : #else
    5106             : #define MT_NRELS_HASH 64
    5107             : #endif
    5108      115146 :     if (nrels >= MT_NRELS_HASH)
    5109             :     {
    5110             :         HASHCTL     hash_ctl;
    5111             : 
    5112           0 :         hash_ctl.keysize = sizeof(Oid);
    5113           0 :         hash_ctl.entrysize = sizeof(MTTargetRelLookup);
    5114           0 :         hash_ctl.hcxt = CurrentMemoryContext;
    5115           0 :         mtstate->mt_resultOidHash =
    5116           0 :             hash_create("ModifyTable target hash",
    5117             :                         nrels, &hash_ctl,
    5118             :                         HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
    5119           0 :         for (i = 0; i < nrels; i++)
    5120             :         {
    5121             :             Oid         hashkey;
    5122             :             MTTargetRelLookup *mtlookup;
    5123             :             bool        found;
    5124             : 
    5125           0 :             resultRelInfo = &mtstate->resultRelInfo[i];
    5126           0 :             hashkey = RelationGetRelid(resultRelInfo->ri_RelationDesc);
    5127             :             mtlookup = (MTTargetRelLookup *)
    5128           0 :                 hash_search(mtstate->mt_resultOidHash, &hashkey,
    5129             :                             HASH_ENTER, &found);
    5130             :             Assert(!found);
    5131           0 :             mtlookup->relationIndex = i;
    5132             :         }
    5133             :     }
    5134             :     else
    5135      115146 :         mtstate->mt_resultOidHash = NULL;
    5136             : 
    5137             :     /*
    5138             :      * Determine if the FDW supports batch insert and determine the batch size
    5139             :      * (a FDW may support batching, but it may be disabled for the
    5140             :      * server/table).
    5141             :      *
    5142             :      * We only do this for INSERT, so that for UPDATE/DELETE the batch size
    5143             :      * remains set to 0.
    5144             :      */
    5145      115146 :     if (operation == CMD_INSERT)
    5146             :     {
    5147             :         /* insert may only have one relation, inheritance is not expanded */
    5148             :         Assert(total_nrels == 1);
    5149       87428 :         resultRelInfo = mtstate->resultRelInfo;
    5150       87428 :         if (!resultRelInfo->ri_usesFdwDirectModify &&
    5151       87428 :             resultRelInfo->ri_FdwRoutine != NULL &&
    5152         174 :             resultRelInfo->ri_FdwRoutine->GetForeignModifyBatchSize &&
    5153         174 :             resultRelInfo->ri_FdwRoutine->ExecForeignBatchInsert)
    5154             :         {
    5155         174 :             resultRelInfo->ri_BatchSize =
    5156         174 :                 resultRelInfo->ri_FdwRoutine->GetForeignModifyBatchSize(resultRelInfo);
    5157         174 :             Assert(resultRelInfo->ri_BatchSize >= 1);
    5158             :         }
    5159             :         else
    5160       87254 :             resultRelInfo->ri_BatchSize = 1;
    5161             :     }
    5162             : 
    5163             :     /*
    5164             :      * Lastly, if this is not the primary (canSetTag) ModifyTable node, add it
    5165             :      * to estate->es_auxmodifytables so that it will be run to completion by
    5166             :      * ExecPostprocessPlan.  (It'd actually work fine to add the primary
    5167             :      * ModifyTable node too, but there's no need.)  Note the use of lcons not
    5168             :      * lappend: we need later-initialized ModifyTable nodes to be shut down
    5169             :      * before earlier ones.  This ensures that we don't throw away RETURNING
    5170             :      * rows that need to be seen by a later CTE subplan.
    5171             :      */
    5172      115146 :     if (!mtstate->canSetTag)
    5173         942 :         estate->es_auxmodifytables = lcons(mtstate,
    5174             :                                            estate->es_auxmodifytables);
    5175             : 
    5176      115146 :     return mtstate;
    5177             : }
    5178             : 
    5179             : /* ----------------------------------------------------------------
    5180             :  *      ExecEndModifyTable
    5181             :  *
    5182             :  *      Shuts down the plan.
    5183             :  *
    5184             :  *      Returns nothing of interest.
    5185             :  * ----------------------------------------------------------------
    5186             :  */
    5187             : void
    5188      110788 : ExecEndModifyTable(ModifyTableState *node)
    5189             : {
    5190             :     int         i;
    5191             : 
    5192             :     /*
    5193             :      * Allow any FDWs to shut down
    5194             :      */
    5195      223644 :     for (i = 0; i < node->mt_nrels; i++)
    5196             :     {
    5197             :         int         j;
    5198      112856 :         ResultRelInfo *resultRelInfo = node->resultRelInfo + i;
    5199             : 
    5200      112856 :         if (!resultRelInfo->ri_usesFdwDirectModify &&
    5201      112664 :             resultRelInfo->ri_FdwRoutine != NULL &&
    5202         302 :             resultRelInfo->ri_FdwRoutine->EndForeignModify != NULL)
    5203         302 :             resultRelInfo->ri_FdwRoutine->EndForeignModify(node->ps.state,
    5204             :                                                            resultRelInfo);
    5205             : 
    5206             :         /*
    5207             :          * Cleanup the initialized batch slots. This only matters for FDWs
    5208             :          * with batching, but the other cases will have ri_NumSlotsInitialized
    5209             :          * == 0.
    5210             :          */
    5211      112912 :         for (j = 0; j < resultRelInfo->ri_NumSlotsInitialized; j++)
    5212             :         {
    5213          56 :             ExecDropSingleTupleTableSlot(resultRelInfo->ri_Slots[j]);
    5214          56 :             ExecDropSingleTupleTableSlot(resultRelInfo->ri_PlanSlots[j]);
    5215             :         }
    5216             :     }
    5217             : 
    5218             :     /*
    5219             :      * Close all the partitioned tables, leaf partitions, and their indices
    5220             :      * and release the slot used for tuple routing, if set.
    5221             :      */
    5222      110788 :     if (node->mt_partition_tuple_routing)
    5223             :     {
    5224        3964 :         ExecCleanupTupleRouting(node, node->mt_partition_tuple_routing);
    5225             : 
    5226        3964 :         if (node->mt_root_tuple_slot)
    5227         644 :             ExecDropSingleTupleTableSlot(node->mt_root_tuple_slot);
    5228             :     }
    5229             : 
    5230             :     /*
    5231             :      * Terminate EPQ execution if active
    5232             :      */
    5233      110788 :     EvalPlanQualEnd(&node->mt_epqstate);
    5234             : 
    5235             :     /*
    5236             :      * shut down subplan
    5237             :      */
    5238      110788 :     ExecEndNode(outerPlanState(node));
    5239      110788 : }
    5240             : 
    5241             : void
    5242           0 : ExecReScanModifyTable(ModifyTableState *node)
    5243             : {
    5244             :     /*
    5245             :      * Currently, we don't need to support rescan on ModifyTable nodes. The
    5246             :      * semantics of that would be a bit debatable anyway.
    5247             :      */
    5248           0 :     elog(ERROR, "ExecReScanModifyTable is not implemented");
    5249             : }

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