LCOV - code coverage report
Current view: top level - src/backend/executor - execReplication.c (source / functions) Hit Total Coverage
Test: PostgreSQL 18devel Lines: 226 258 87.6 %
Date: 2025-04-01 14:15:22 Functions: 12 12 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * execReplication.c
       4             :  *    miscellaneous executor routines for logical replication
       5             :  *
       6             :  * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  * IDENTIFICATION
      10             :  *    src/backend/executor/execReplication.c
      11             :  *
      12             :  *-------------------------------------------------------------------------
      13             :  */
      14             : 
      15             : #include "postgres.h"
      16             : 
      17             : #include "access/genam.h"
      18             : #include "access/gist.h"
      19             : #include "access/relscan.h"
      20             : #include "access/tableam.h"
      21             : #include "access/transam.h"
      22             : #include "access/xact.h"
      23             : #include "catalog/pg_am_d.h"
      24             : #include "commands/trigger.h"
      25             : #include "executor/executor.h"
      26             : #include "executor/nodeModifyTable.h"
      27             : #include "replication/conflict.h"
      28             : #include "replication/logicalrelation.h"
      29             : #include "storage/lmgr.h"
      30             : #include "utils/builtins.h"
      31             : #include "utils/lsyscache.h"
      32             : #include "utils/rel.h"
      33             : #include "utils/snapmgr.h"
      34             : #include "utils/syscache.h"
      35             : #include "utils/typcache.h"
      36             : 
      37             : 
      38             : static bool tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
      39             :                          TypeCacheEntry **eq);
      40             : 
      41             : /*
      42             :  * Setup a ScanKey for a search in the relation 'rel' for a tuple 'key' that
      43             :  * is setup to match 'rel' (*NOT* idxrel!).
      44             :  *
      45             :  * Returns how many columns to use for the index scan.
      46             :  *
      47             :  * This is not generic routine, idxrel must be PK, RI, or an index that can be
      48             :  * used for REPLICA IDENTITY FULL table. See FindUsableIndexForReplicaIdentityFull()
      49             :  * for details.
      50             :  *
      51             :  * By definition, replication identity of a rel meets all limitations associated
      52             :  * with that. Note that any other index could also meet these limitations.
      53             :  */
      54             : static int
      55      144196 : build_replindex_scan_key(ScanKey skey, Relation rel, Relation idxrel,
      56             :                          TupleTableSlot *searchslot)
      57             : {
      58             :     int         index_attoff;
      59      144196 :     int         skey_attoff = 0;
      60             :     Datum       indclassDatum;
      61             :     oidvector  *opclass;
      62      144196 :     int2vector *indkey = &idxrel->rd_index->indkey;
      63             : 
      64      144196 :     indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, idxrel->rd_indextuple,
      65             :                                            Anum_pg_index_indclass);
      66      144196 :     opclass = (oidvector *) DatumGetPointer(indclassDatum);
      67             : 
      68             :     /* Build scankey for every non-expression attribute in the index. */
      69      288438 :     for (index_attoff = 0; index_attoff < IndexRelationGetNumberOfKeyAttributes(idxrel);
      70      144242 :          index_attoff++)
      71             :     {
      72             :         Oid         operator;
      73             :         Oid         optype;
      74             :         Oid         opfamily;
      75             :         RegProcedure regop;
      76      144242 :         int         table_attno = indkey->values[index_attoff];
      77             :         StrategyNumber eq_strategy;
      78             : 
      79      144242 :         if (!AttributeNumberIsValid(table_attno))
      80             :         {
      81             :             /*
      82             :              * XXX: Currently, we don't support expressions in the scan key,
      83             :              * see code below.
      84             :              */
      85           4 :             continue;
      86             :         }
      87             : 
      88             :         /*
      89             :          * Load the operator info.  We need this to get the equality operator
      90             :          * function for the scan key.
      91             :          */
      92      144238 :         optype = get_opclass_input_type(opclass->values[index_attoff]);
      93      144238 :         opfamily = get_opclass_family(opclass->values[index_attoff]);
      94      144238 :         eq_strategy = IndexAmTranslateCompareType(COMPARE_EQ, idxrel->rd_rel->relam, opfamily, false);
      95      144238 :         operator = get_opfamily_member(opfamily, optype,
      96             :                                        optype,
      97             :                                        eq_strategy);
      98             : 
      99      144238 :         if (!OidIsValid(operator))
     100           0 :             elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
     101             :                  eq_strategy, optype, optype, opfamily);
     102             : 
     103      144238 :         regop = get_opcode(operator);
     104             : 
     105             :         /* Initialize the scankey. */
     106      144238 :         ScanKeyInit(&skey[skey_attoff],
     107      144238 :                     index_attoff + 1,
     108             :                     eq_strategy,
     109             :                     regop,
     110      144238 :                     searchslot->tts_values[table_attno - 1]);
     111             : 
     112      144238 :         skey[skey_attoff].sk_collation = idxrel->rd_indcollation[index_attoff];
     113             : 
     114             :         /* Check for null value. */
     115      144238 :         if (searchslot->tts_isnull[table_attno - 1])
     116           2 :             skey[skey_attoff].sk_flags |= (SK_ISNULL | SK_SEARCHNULL);
     117             : 
     118      144238 :         skey_attoff++;
     119             :     }
     120             : 
     121             :     /* There must always be at least one attribute for the index scan. */
     122             :     Assert(skey_attoff > 0);
     123             : 
     124      144196 :     return skey_attoff;
     125             : }
     126             : 
     127             : 
     128             : /*
     129             :  * Helper function to check if it is necessary to re-fetch and lock the tuple
     130             :  * due to concurrent modifications. This function should be called after
     131             :  * invoking table_tuple_lock.
     132             :  */
     133             : static bool
     134      144492 : should_refetch_tuple(TM_Result res, TM_FailureData *tmfd)
     135             : {
     136      144492 :     bool        refetch = false;
     137             : 
     138      144492 :     switch (res)
     139             :     {
     140      144492 :         case TM_Ok:
     141      144492 :             break;
     142           0 :         case TM_Updated:
     143             :             /* XXX: Improve handling here */
     144           0 :             if (ItemPointerIndicatesMovedPartitions(&tmfd->ctid))
     145           0 :                 ereport(LOG,
     146             :                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
     147             :                          errmsg("tuple to be locked was already moved to another partition due to concurrent update, retrying")));
     148             :             else
     149           0 :                 ereport(LOG,
     150             :                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
     151             :                          errmsg("concurrent update, retrying")));
     152           0 :             refetch = true;
     153           0 :             break;
     154           0 :         case TM_Deleted:
     155             :             /* XXX: Improve handling here */
     156           0 :             ereport(LOG,
     157             :                     (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
     158             :                      errmsg("concurrent delete, retrying")));
     159           0 :             refetch = true;
     160           0 :             break;
     161           0 :         case TM_Invisible:
     162           0 :             elog(ERROR, "attempted to lock invisible tuple");
     163             :             break;
     164           0 :         default:
     165           0 :             elog(ERROR, "unexpected table_tuple_lock status: %u", res);
     166             :             break;
     167             :     }
     168             : 
     169      144492 :     return refetch;
     170             : }
     171             : 
     172             : /*
     173             :  * Search the relation 'rel' for tuple using the index.
     174             :  *
     175             :  * If a matching tuple is found, lock it with lockmode, fill the slot with its
     176             :  * contents, and return true.  Return false otherwise.
     177             :  */
     178             : bool
     179      144196 : RelationFindReplTupleByIndex(Relation rel, Oid idxoid,
     180             :                              LockTupleMode lockmode,
     181             :                              TupleTableSlot *searchslot,
     182             :                              TupleTableSlot *outslot)
     183             : {
     184             :     ScanKeyData skey[INDEX_MAX_KEYS];
     185             :     int         skey_attoff;
     186             :     IndexScanDesc scan;
     187             :     SnapshotData snap;
     188             :     TransactionId xwait;
     189             :     Relation    idxrel;
     190             :     bool        found;
     191      144196 :     TypeCacheEntry **eq = NULL;
     192             :     bool        isIdxSafeToSkipDuplicates;
     193             : 
     194             :     /* Open the index. */
     195      144196 :     idxrel = index_open(idxoid, RowExclusiveLock);
     196             : 
     197      144196 :     isIdxSafeToSkipDuplicates = (GetRelationIdentityOrPK(rel) == idxoid);
     198             : 
     199      144196 :     InitDirtySnapshot(snap);
     200             : 
     201             :     /* Build scan key. */
     202      144196 :     skey_attoff = build_replindex_scan_key(skey, rel, idxrel, searchslot);
     203             : 
     204             :     /* Start an index scan. */
     205      144196 :     scan = index_beginscan(rel, idxrel, &snap, NULL, skey_attoff, 0);
     206             : 
     207      144196 : retry:
     208      144196 :     found = false;
     209             : 
     210      144196 :     index_rescan(scan, skey, skey_attoff, NULL, 0);
     211             : 
     212             :     /* Try to find the tuple */
     213      144196 :     while (index_getnext_slot(scan, ForwardScanDirection, outslot))
     214             :     {
     215             :         /*
     216             :          * Avoid expensive equality check if the index is primary key or
     217             :          * replica identity index.
     218             :          */
     219      144172 :         if (!isIdxSafeToSkipDuplicates)
     220             :         {
     221          34 :             if (eq == NULL)
     222          34 :                 eq = palloc0(sizeof(*eq) * outslot->tts_tupleDescriptor->natts);
     223             : 
     224          34 :             if (!tuples_equal(outslot, searchslot, eq))
     225           0 :                 continue;
     226             :         }
     227             : 
     228      144172 :         ExecMaterializeSlot(outslot);
     229             : 
     230      288344 :         xwait = TransactionIdIsValid(snap.xmin) ?
     231      144172 :             snap.xmin : snap.xmax;
     232             : 
     233             :         /*
     234             :          * If the tuple is locked, wait for locking transaction to finish and
     235             :          * retry.
     236             :          */
     237      144172 :         if (TransactionIdIsValid(xwait))
     238             :         {
     239           0 :             XactLockTableWait(xwait, NULL, NULL, XLTW_None);
     240           0 :             goto retry;
     241             :         }
     242             : 
     243             :         /* Found our tuple and it's not locked */
     244      144172 :         found = true;
     245      144172 :         break;
     246             :     }
     247             : 
     248             :     /* Found tuple, try to lock it in the lockmode. */
     249      144196 :     if (found)
     250             :     {
     251             :         TM_FailureData tmfd;
     252             :         TM_Result   res;
     253             : 
     254      144172 :         PushActiveSnapshot(GetLatestSnapshot());
     255             : 
     256      144172 :         res = table_tuple_lock(rel, &(outslot->tts_tid), GetActiveSnapshot(),
     257             :                                outslot,
     258             :                                GetCurrentCommandId(false),
     259             :                                lockmode,
     260             :                                LockWaitBlock,
     261             :                                0 /* don't follow updates */ ,
     262             :                                &tmfd);
     263             : 
     264      144172 :         PopActiveSnapshot();
     265             : 
     266      144172 :         if (should_refetch_tuple(res, &tmfd))
     267           0 :             goto retry;
     268             :     }
     269             : 
     270      144196 :     index_endscan(scan);
     271             : 
     272             :     /* Don't release lock until commit. */
     273      144196 :     index_close(idxrel, NoLock);
     274             : 
     275      144196 :     return found;
     276             : }
     277             : 
     278             : /*
     279             :  * Compare the tuples in the slots by checking if they have equal values.
     280             :  */
     281             : static bool
     282      210646 : tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
     283             :              TypeCacheEntry **eq)
     284             : {
     285             :     int         attrnum;
     286             : 
     287             :     Assert(slot1->tts_tupleDescriptor->natts ==
     288             :            slot2->tts_tupleDescriptor->natts);
     289             : 
     290      210646 :     slot_getallattrs(slot1);
     291      210646 :     slot_getallattrs(slot2);
     292             : 
     293             :     /* Check equality of the attributes. */
     294      211046 :     for (attrnum = 0; attrnum < slot1->tts_tupleDescriptor->natts; attrnum++)
     295             :     {
     296             :         Form_pg_attribute att;
     297             :         TypeCacheEntry *typentry;
     298             : 
     299      210718 :         att = TupleDescAttr(slot1->tts_tupleDescriptor, attrnum);
     300             : 
     301             :         /*
     302             :          * Ignore dropped and generated columns as the publisher doesn't send
     303             :          * those
     304             :          */
     305      210718 :         if (att->attisdropped || att->attgenerated)
     306           2 :             continue;
     307             : 
     308             :         /*
     309             :          * If one value is NULL and other is not, then they are certainly not
     310             :          * equal
     311             :          */
     312      210716 :         if (slot1->tts_isnull[attrnum] != slot2->tts_isnull[attrnum])
     313           0 :             return false;
     314             : 
     315             :         /*
     316             :          * If both are NULL, they can be considered equal.
     317             :          */
     318      210716 :         if (slot1->tts_isnull[attrnum] || slot2->tts_isnull[attrnum])
     319           2 :             continue;
     320             : 
     321      210714 :         typentry = eq[attrnum];
     322      210714 :         if (typentry == NULL)
     323             :         {
     324         400 :             typentry = lookup_type_cache(att->atttypid,
     325             :                                          TYPECACHE_EQ_OPR_FINFO);
     326         400 :             if (!OidIsValid(typentry->eq_opr_finfo.fn_oid))
     327           0 :                 ereport(ERROR,
     328             :                         (errcode(ERRCODE_UNDEFINED_FUNCTION),
     329             :                          errmsg("could not identify an equality operator for type %s",
     330             :                                 format_type_be(att->atttypid))));
     331         400 :             eq[attrnum] = typentry;
     332             :         }
     333             : 
     334      210714 :         if (!DatumGetBool(FunctionCall2Coll(&typentry->eq_opr_finfo,
     335             :                                             att->attcollation,
     336      210714 :                                             slot1->tts_values[attrnum],
     337      210714 :                                             slot2->tts_values[attrnum])))
     338      210318 :             return false;
     339             :     }
     340             : 
     341         328 :     return true;
     342             : }
     343             : 
     344             : /*
     345             :  * Search the relation 'rel' for tuple using the sequential scan.
     346             :  *
     347             :  * If a matching tuple is found, lock it with lockmode, fill the slot with its
     348             :  * contents, and return true.  Return false otherwise.
     349             :  *
     350             :  * Note that this stops on the first matching tuple.
     351             :  *
     352             :  * This can obviously be quite slow on tables that have more than few rows.
     353             :  */
     354             : bool
     355         298 : RelationFindReplTupleSeq(Relation rel, LockTupleMode lockmode,
     356             :                          TupleTableSlot *searchslot, TupleTableSlot *outslot)
     357             : {
     358             :     TupleTableSlot *scanslot;
     359             :     TableScanDesc scan;
     360             :     SnapshotData snap;
     361             :     TypeCacheEntry **eq;
     362             :     TransactionId xwait;
     363             :     bool        found;
     364         298 :     TupleDesc   desc PG_USED_FOR_ASSERTS_ONLY = RelationGetDescr(rel);
     365             : 
     366             :     Assert(equalTupleDescs(desc, outslot->tts_tupleDescriptor));
     367             : 
     368         298 :     eq = palloc0(sizeof(*eq) * outslot->tts_tupleDescriptor->natts);
     369             : 
     370             :     /* Start a heap scan. */
     371         298 :     InitDirtySnapshot(snap);
     372         298 :     scan = table_beginscan(rel, &snap, 0, NULL);
     373         298 :     scanslot = table_slot_create(rel, NULL);
     374             : 
     375         298 : retry:
     376         298 :     found = false;
     377             : 
     378         298 :     table_rescan(scan, NULL);
     379             : 
     380             :     /* Try to find the tuple */
     381      210616 :     while (table_scan_getnextslot(scan, ForwardScanDirection, scanslot))
     382             :     {
     383      210612 :         if (!tuples_equal(scanslot, searchslot, eq))
     384      210318 :             continue;
     385             : 
     386         294 :         found = true;
     387         294 :         ExecCopySlot(outslot, scanslot);
     388             : 
     389         588 :         xwait = TransactionIdIsValid(snap.xmin) ?
     390         294 :             snap.xmin : snap.xmax;
     391             : 
     392             :         /*
     393             :          * If the tuple is locked, wait for locking transaction to finish and
     394             :          * retry.
     395             :          */
     396         294 :         if (TransactionIdIsValid(xwait))
     397             :         {
     398           0 :             XactLockTableWait(xwait, NULL, NULL, XLTW_None);
     399           0 :             goto retry;
     400             :         }
     401             : 
     402             :         /* Found our tuple and it's not locked */
     403         294 :         break;
     404             :     }
     405             : 
     406             :     /* Found tuple, try to lock it in the lockmode. */
     407         298 :     if (found)
     408             :     {
     409             :         TM_FailureData tmfd;
     410             :         TM_Result   res;
     411             : 
     412         294 :         PushActiveSnapshot(GetLatestSnapshot());
     413             : 
     414         294 :         res = table_tuple_lock(rel, &(outslot->tts_tid), GetActiveSnapshot(),
     415             :                                outslot,
     416             :                                GetCurrentCommandId(false),
     417             :                                lockmode,
     418             :                                LockWaitBlock,
     419             :                                0 /* don't follow updates */ ,
     420             :                                &tmfd);
     421             : 
     422         294 :         PopActiveSnapshot();
     423             : 
     424         294 :         if (should_refetch_tuple(res, &tmfd))
     425           0 :             goto retry;
     426             :     }
     427             : 
     428         298 :     table_endscan(scan);
     429         298 :     ExecDropSingleTupleTableSlot(scanslot);
     430             : 
     431         298 :     return found;
     432             : }
     433             : 
     434             : /*
     435             :  * Find the tuple that violates the passed unique index (conflictindex).
     436             :  *
     437             :  * If the conflicting tuple is found return true, otherwise false.
     438             :  *
     439             :  * We lock the tuple to avoid getting it deleted before the caller can fetch
     440             :  * the required information. Note that if the tuple is deleted before a lock
     441             :  * is acquired, we will retry to find the conflicting tuple again.
     442             :  */
     443             : static bool
     444          30 : FindConflictTuple(ResultRelInfo *resultRelInfo, EState *estate,
     445             :                   Oid conflictindex, TupleTableSlot *slot,
     446             :                   TupleTableSlot **conflictslot)
     447             : {
     448          30 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     449             :     ItemPointerData conflictTid;
     450             :     TM_FailureData tmfd;
     451             :     TM_Result   res;
     452             : 
     453          30 :     *conflictslot = NULL;
     454             : 
     455          30 : retry:
     456          30 :     if (ExecCheckIndexConstraints(resultRelInfo, slot, estate,
     457             :                                   &conflictTid, &slot->tts_tid,
     458          30 :                                   list_make1_oid(conflictindex)))
     459             :     {
     460           2 :         if (*conflictslot)
     461           0 :             ExecDropSingleTupleTableSlot(*conflictslot);
     462             : 
     463           2 :         *conflictslot = NULL;
     464           2 :         return false;
     465             :     }
     466             : 
     467          26 :     *conflictslot = table_slot_create(rel, NULL);
     468             : 
     469          26 :     PushActiveSnapshot(GetLatestSnapshot());
     470             : 
     471          26 :     res = table_tuple_lock(rel, &conflictTid, GetActiveSnapshot(),
     472             :                            *conflictslot,
     473             :                            GetCurrentCommandId(false),
     474             :                            LockTupleShare,
     475             :                            LockWaitBlock,
     476             :                            0 /* don't follow updates */ ,
     477             :                            &tmfd);
     478             : 
     479          26 :     PopActiveSnapshot();
     480             : 
     481          26 :     if (should_refetch_tuple(res, &tmfd))
     482           0 :         goto retry;
     483             : 
     484          26 :     return true;
     485             : }
     486             : 
     487             : /*
     488             :  * Check all the unique indexes in 'recheckIndexes' for conflict with the
     489             :  * tuple in 'remoteslot' and report if found.
     490             :  */
     491             : static void
     492          22 : CheckAndReportConflict(ResultRelInfo *resultRelInfo, EState *estate,
     493             :                        ConflictType type, List *recheckIndexes,
     494             :                        TupleTableSlot *searchslot, TupleTableSlot *remoteslot)
     495             : {
     496          22 :     List       *conflicttuples = NIL;
     497             :     TupleTableSlot *conflictslot;
     498             : 
     499             :     /* Check all the unique indexes for conflicts */
     500          70 :     foreach_oid(uniqueidx, resultRelInfo->ri_onConflictArbiterIndexes)
     501             :     {
     502          58 :         if (list_member_oid(recheckIndexes, uniqueidx) &&
     503          30 :             FindConflictTuple(resultRelInfo, estate, uniqueidx, remoteslot,
     504             :                               &conflictslot))
     505             :         {
     506          26 :             ConflictTupleInfo *conflicttuple = palloc0_object(ConflictTupleInfo);
     507             : 
     508          26 :             conflicttuple->slot = conflictslot;
     509          26 :             conflicttuple->indexoid = uniqueidx;
     510             : 
     511          26 :             GetTupleTransactionInfo(conflictslot, &conflicttuple->xmin,
     512             :                                     &conflicttuple->origin, &conflicttuple->ts);
     513             : 
     514          26 :             conflicttuples = lappend(conflicttuples, conflicttuple);
     515             :         }
     516             :     }
     517             : 
     518             :     /* Report the conflict, if found */
     519          20 :     if (conflicttuples)
     520          18 :         ReportApplyConflict(estate, resultRelInfo, ERROR,
     521          18 :                             list_length(conflicttuples) > 1 ? CT_MULTIPLE_UNIQUE_CONFLICTS : type,
     522             :                             searchslot, remoteslot, conflicttuples);
     523           2 : }
     524             : 
     525             : /*
     526             :  * Insert tuple represented in the slot to the relation, update the indexes,
     527             :  * and execute any constraints and per-row triggers.
     528             :  *
     529             :  * Caller is responsible for opening the indexes.
     530             :  */
     531             : void
     532      152418 : ExecSimpleRelationInsert(ResultRelInfo *resultRelInfo,
     533             :                          EState *estate, TupleTableSlot *slot)
     534             : {
     535      152418 :     bool        skip_tuple = false;
     536      152418 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     537             : 
     538             :     /* For now we support only tables. */
     539             :     Assert(rel->rd_rel->relkind == RELKIND_RELATION);
     540             : 
     541      152418 :     CheckCmdReplicaIdentity(rel, CMD_INSERT);
     542             : 
     543             :     /* BEFORE ROW INSERT Triggers */
     544      152418 :     if (resultRelInfo->ri_TrigDesc &&
     545          38 :         resultRelInfo->ri_TrigDesc->trig_insert_before_row)
     546             :     {
     547           6 :         if (!ExecBRInsertTriggers(estate, resultRelInfo, slot))
     548           2 :             skip_tuple = true;  /* "do nothing" */
     549             :     }
     550             : 
     551      152418 :     if (!skip_tuple)
     552             :     {
     553      152416 :         List       *recheckIndexes = NIL;
     554             :         List       *conflictindexes;
     555      152416 :         bool        conflict = false;
     556             : 
     557             :         /* Compute stored generated columns */
     558      152416 :         if (rel->rd_att->constr &&
     559       90930 :             rel->rd_att->constr->has_generated_stored)
     560           8 :             ExecComputeStoredGenerated(resultRelInfo, estate, slot,
     561             :                                        CMD_INSERT);
     562             : 
     563             :         /* Check the constraints of the tuple */
     564      152416 :         if (rel->rd_att->constr)
     565       90930 :             ExecConstraints(resultRelInfo, slot, estate);
     566      152416 :         if (rel->rd_rel->relispartition)
     567         120 :             ExecPartitionCheck(resultRelInfo, slot, estate, true);
     568             : 
     569             :         /* OK, store the tuple and create index entries for it */
     570      152416 :         simple_table_tuple_insert(resultRelInfo->ri_RelationDesc, slot);
     571             : 
     572      152416 :         conflictindexes = resultRelInfo->ri_onConflictArbiterIndexes;
     573             : 
     574      152416 :         if (resultRelInfo->ri_NumIndices > 0)
     575      111738 :             recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
     576             :                                                    slot, estate, false,
     577             :                                                    conflictindexes ? true : false,
     578             :                                                    &conflict,
     579             :                                                    conflictindexes, false);
     580             : 
     581             :         /*
     582             :          * Checks the conflict indexes to fetch the conflicting local tuple
     583             :          * and reports the conflict. We perform this check here, instead of
     584             :          * performing an additional index scan before the actual insertion and
     585             :          * reporting the conflict if any conflicting tuples are found. This is
     586             :          * to avoid the overhead of executing the extra scan for each INSERT
     587             :          * operation, even when no conflict arises, which could introduce
     588             :          * significant overhead to replication, particularly in cases where
     589             :          * conflicts are rare.
     590             :          *
     591             :          * XXX OTOH, this could lead to clean-up effort for dead tuples added
     592             :          * in heap and index in case of conflicts. But as conflicts shouldn't
     593             :          * be a frequent thing so we preferred to save the performance
     594             :          * overhead of extra scan before each insertion.
     595             :          */
     596      152416 :         if (conflict)
     597          18 :             CheckAndReportConflict(resultRelInfo, estate, CT_INSERT_EXISTS,
     598             :                                    recheckIndexes, NULL, slot);
     599             : 
     600             :         /* AFTER ROW INSERT Triggers */
     601      152400 :         ExecARInsertTriggers(estate, resultRelInfo, slot,
     602             :                              recheckIndexes, NULL);
     603             : 
     604             :         /*
     605             :          * XXX we should in theory pass a TransitionCaptureState object to the
     606             :          * above to capture transition tuples, but after statement triggers
     607             :          * don't actually get fired by replication yet anyway
     608             :          */
     609             : 
     610      152400 :         list_free(recheckIndexes);
     611             :     }
     612      152402 : }
     613             : 
     614             : /*
     615             :  * Find the searchslot tuple and update it with data in the slot,
     616             :  * update the indexes, and execute any constraints and per-row triggers.
     617             :  *
     618             :  * Caller is responsible for opening the indexes.
     619             :  */
     620             : void
     621       63846 : ExecSimpleRelationUpdate(ResultRelInfo *resultRelInfo,
     622             :                          EState *estate, EPQState *epqstate,
     623             :                          TupleTableSlot *searchslot, TupleTableSlot *slot)
     624             : {
     625       63846 :     bool        skip_tuple = false;
     626       63846 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     627       63846 :     ItemPointer tid = &(searchslot->tts_tid);
     628             : 
     629             :     /*
     630             :      * We support only non-system tables, with
     631             :      * check_publication_add_relation() accountable.
     632             :      */
     633             :     Assert(rel->rd_rel->relkind == RELKIND_RELATION);
     634             :     Assert(!IsCatalogRelation(rel));
     635             : 
     636       63846 :     CheckCmdReplicaIdentity(rel, CMD_UPDATE);
     637             : 
     638             :     /* BEFORE ROW UPDATE Triggers */
     639       63846 :     if (resultRelInfo->ri_TrigDesc &&
     640          20 :         resultRelInfo->ri_TrigDesc->trig_update_before_row)
     641             :     {
     642           6 :         if (!ExecBRUpdateTriggers(estate, epqstate, resultRelInfo,
     643             :                                   tid, NULL, slot, NULL, NULL))
     644           4 :             skip_tuple = true;  /* "do nothing" */
     645             :     }
     646             : 
     647       63846 :     if (!skip_tuple)
     648             :     {
     649       63842 :         List       *recheckIndexes = NIL;
     650             :         TU_UpdateIndexes update_indexes;
     651             :         List       *conflictindexes;
     652       63842 :         bool        conflict = false;
     653             : 
     654             :         /* Compute stored generated columns */
     655       63842 :         if (rel->rd_att->constr &&
     656       63752 :             rel->rd_att->constr->has_generated_stored)
     657           4 :             ExecComputeStoredGenerated(resultRelInfo, estate, slot,
     658             :                                        CMD_UPDATE);
     659             : 
     660             :         /* Check the constraints of the tuple */
     661       63842 :         if (rel->rd_att->constr)
     662       63752 :             ExecConstraints(resultRelInfo, slot, estate);
     663       63842 :         if (rel->rd_rel->relispartition)
     664          24 :             ExecPartitionCheck(resultRelInfo, slot, estate, true);
     665             : 
     666       63842 :         simple_table_tuple_update(rel, tid, slot, estate->es_snapshot,
     667             :                                   &update_indexes);
     668             : 
     669       63842 :         conflictindexes = resultRelInfo->ri_onConflictArbiterIndexes;
     670             : 
     671       63842 :         if (resultRelInfo->ri_NumIndices > 0 && (update_indexes != TU_None))
     672       40400 :             recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
     673             :                                                    slot, estate, true,
     674             :                                                    conflictindexes ? true : false,
     675             :                                                    &conflict, conflictindexes,
     676             :                                                    (update_indexes == TU_Summarizing));
     677             : 
     678             :         /*
     679             :          * Refer to the comments above the call to CheckAndReportConflict() in
     680             :          * ExecSimpleRelationInsert to understand why this check is done at
     681             :          * this point.
     682             :          */
     683       63842 :         if (conflict)
     684           4 :             CheckAndReportConflict(resultRelInfo, estate, CT_UPDATE_EXISTS,
     685             :                                    recheckIndexes, searchslot, slot);
     686             : 
     687             :         /* AFTER ROW UPDATE Triggers */
     688       63838 :         ExecARUpdateTriggers(estate, resultRelInfo,
     689             :                              NULL, NULL,
     690             :                              tid, NULL, slot,
     691             :                              recheckIndexes, NULL, false);
     692             : 
     693       63838 :         list_free(recheckIndexes);
     694             :     }
     695       63842 : }
     696             : 
     697             : /*
     698             :  * Find the searchslot tuple and delete it, and execute any constraints
     699             :  * and per-row triggers.
     700             :  *
     701             :  * Caller is responsible for opening the indexes.
     702             :  */
     703             : void
     704       80620 : ExecSimpleRelationDelete(ResultRelInfo *resultRelInfo,
     705             :                          EState *estate, EPQState *epqstate,
     706             :                          TupleTableSlot *searchslot)
     707             : {
     708       80620 :     bool        skip_tuple = false;
     709       80620 :     Relation    rel = resultRelInfo->ri_RelationDesc;
     710       80620 :     ItemPointer tid = &searchslot->tts_tid;
     711             : 
     712       80620 :     CheckCmdReplicaIdentity(rel, CMD_DELETE);
     713             : 
     714             :     /* BEFORE ROW DELETE Triggers */
     715       80620 :     if (resultRelInfo->ri_TrigDesc &&
     716          20 :         resultRelInfo->ri_TrigDesc->trig_delete_before_row)
     717             :     {
     718           0 :         skip_tuple = !ExecBRDeleteTriggers(estate, epqstate, resultRelInfo,
     719           0 :                                            tid, NULL, NULL, NULL, NULL);
     720             :     }
     721             : 
     722       80620 :     if (!skip_tuple)
     723             :     {
     724             :         /* OK, delete the tuple */
     725       80620 :         simple_table_tuple_delete(rel, tid, estate->es_snapshot);
     726             : 
     727             :         /* AFTER ROW DELETE Triggers */
     728       80620 :         ExecARDeleteTriggers(estate, resultRelInfo,
     729             :                              tid, NULL, NULL, false);
     730             :     }
     731       80620 : }
     732             : 
     733             : /*
     734             :  * Check if command can be executed with current replica identity.
     735             :  */
     736             : void
     737      429318 : CheckCmdReplicaIdentity(Relation rel, CmdType cmd)
     738             : {
     739             :     PublicationDesc pubdesc;
     740             : 
     741             :     /*
     742             :      * Skip checking the replica identity for partitioned tables, because the
     743             :      * operations are actually performed on the leaf partitions.
     744             :      */
     745      429318 :     if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
     746      407362 :         return;
     747             : 
     748             :     /* We only need to do checks for UPDATE and DELETE. */
     749      423316 :     if (cmd != CMD_UPDATE && cmd != CMD_DELETE)
     750      250922 :         return;
     751             : 
     752             :     /*
     753             :      * It is only safe to execute UPDATE/DELETE if the relation does not
     754             :      * publish UPDATEs or DELETEs, or all the following conditions are
     755             :      * satisfied:
     756             :      *
     757             :      * 1. All columns, referenced in the row filters from publications which
     758             :      * the relation is in, are valid - i.e. when all referenced columns are
     759             :      * part of REPLICA IDENTITY.
     760             :      *
     761             :      * 2. All columns, referenced in the column lists are valid - i.e. when
     762             :      * all columns referenced in the REPLICA IDENTITY are covered by the
     763             :      * column list.
     764             :      *
     765             :      * 3. All generated columns in REPLICA IDENTITY of the relation, are valid
     766             :      * - i.e. when all these generated columns are published.
     767             :      *
     768             :      * XXX We could optimize it by first checking whether any of the
     769             :      * publications have a row filter or column list for this relation, or if
     770             :      * the relation contains a generated column. If none of these exist and
     771             :      * the relation has replica identity then we can avoid building the
     772             :      * descriptor but as this happens only one time it doesn't seem worth the
     773             :      * additional complexity.
     774             :      */
     775      172394 :     RelationBuildPublicationDesc(rel, &pubdesc);
     776      172394 :     if (cmd == CMD_UPDATE && !pubdesc.rf_valid_for_update)
     777          60 :         ereport(ERROR,
     778             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     779             :                  errmsg("cannot update table \"%s\"",
     780             :                         RelationGetRelationName(rel)),
     781             :                  errdetail("Column used in the publication WHERE expression is not part of the replica identity.")));
     782      172334 :     else if (cmd == CMD_UPDATE && !pubdesc.cols_valid_for_update)
     783         108 :         ereport(ERROR,
     784             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     785             :                  errmsg("cannot update table \"%s\"",
     786             :                         RelationGetRelationName(rel)),
     787             :                  errdetail("Column list used by the publication does not cover the replica identity.")));
     788      172226 :     else if (cmd == CMD_UPDATE && !pubdesc.gencols_valid_for_update)
     789          24 :         ereport(ERROR,
     790             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     791             :                  errmsg("cannot update table \"%s\"",
     792             :                         RelationGetRelationName(rel)),
     793             :                  errdetail("Replica identity must not contain unpublished generated columns.")));
     794      172202 :     else if (cmd == CMD_DELETE && !pubdesc.rf_valid_for_delete)
     795           0 :         ereport(ERROR,
     796             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     797             :                  errmsg("cannot delete from table \"%s\"",
     798             :                         RelationGetRelationName(rel)),
     799             :                  errdetail("Column used in the publication WHERE expression is not part of the replica identity.")));
     800      172202 :     else if (cmd == CMD_DELETE && !pubdesc.cols_valid_for_delete)
     801           0 :         ereport(ERROR,
     802             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     803             :                  errmsg("cannot delete from table \"%s\"",
     804             :                         RelationGetRelationName(rel)),
     805             :                  errdetail("Column list used by the publication does not cover the replica identity.")));
     806      172202 :     else if (cmd == CMD_DELETE && !pubdesc.gencols_valid_for_delete)
     807           0 :         ereport(ERROR,
     808             :                 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
     809             :                  errmsg("cannot delete from table \"%s\"",
     810             :                         RelationGetRelationName(rel)),
     811             :                  errdetail("Replica identity must not contain unpublished generated columns.")));
     812             : 
     813             :     /* If relation has replica identity we are always good. */
     814      172202 :     if (OidIsValid(RelationGetReplicaIndex(rel)))
     815      149988 :         return;
     816             : 
     817             :     /* REPLICA IDENTITY FULL is also good for UPDATE/DELETE. */
     818       22214 :     if (rel->rd_rel->relreplident == REPLICA_IDENTITY_FULL)
     819         450 :         return;
     820             : 
     821             :     /*
     822             :      * This is UPDATE/DELETE and there is no replica identity.
     823             :      *
     824             :      * Check if the table publishes UPDATES or DELETES.
     825             :      */
     826       21764 :     if (cmd == CMD_UPDATE && pubdesc.pubactions.pubupdate)
     827         106 :         ereport(ERROR,
     828             :                 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
     829             :                  errmsg("cannot update table \"%s\" because it does not have a replica identity and publishes updates",
     830             :                         RelationGetRelationName(rel)),
     831             :                  errhint("To enable updating the table, set REPLICA IDENTITY using ALTER TABLE.")));
     832       21658 :     else if (cmd == CMD_DELETE && pubdesc.pubactions.pubdelete)
     833          10 :         ereport(ERROR,
     834             :                 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
     835             :                  errmsg("cannot delete from table \"%s\" because it does not have a replica identity and publishes deletes",
     836             :                         RelationGetRelationName(rel)),
     837             :                  errhint("To enable deleting from the table, set REPLICA IDENTITY using ALTER TABLE.")));
     838             : }
     839             : 
     840             : 
     841             : /*
     842             :  * Check if we support writing into specific relkind.
     843             :  *
     844             :  * The nspname and relname are only needed for error reporting.
     845             :  */
     846             : void
     847        1732 : CheckSubscriptionRelkind(char relkind, const char *nspname,
     848             :                          const char *relname)
     849             : {
     850        1732 :     if (relkind != RELKIND_RELATION && relkind != RELKIND_PARTITIONED_TABLE)
     851           0 :         ereport(ERROR,
     852             :                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
     853             :                  errmsg("cannot use relation \"%s.%s\" as logical replication target",
     854             :                         nspname, relname),
     855             :                  errdetail_relkind_not_supported(relkind)));
     856        1732 : }

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