LCOV - code coverage report
Current view: top level - src/backend/rewrite - rewriteSupport.c (source / functions) Coverage Total Hit
Test: PostgreSQL 20devel Lines: 96.0 % 25 24
Test Date: 2026-07-03 19:57:34 Functions: 100.0 % 3 3
Legend: Lines:     hit not hit
Branches: + taken - not taken # not executed
Branches: 66.7 % 12 8

             Branch data     Line data    Source code
       1                 :             : /*-------------------------------------------------------------------------
       2                 :             :  *
       3                 :             :  * rewriteSupport.c
       4                 :             :  *
       5                 :             :  *
       6                 :             :  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
       7                 :             :  * Portions Copyright (c) 1994, Regents of the University of California
       8                 :             :  *
       9                 :             :  *
      10                 :             :  * IDENTIFICATION
      11                 :             :  *    src/backend/rewrite/rewriteSupport.c
      12                 :             :  *
      13                 :             :  *-------------------------------------------------------------------------
      14                 :             :  */
      15                 :             : #include "postgres.h"
      16                 :             : 
      17                 :             : #include "access/htup_details.h"
      18                 :             : #include "access/table.h"
      19                 :             : #include "catalog/indexing.h"
      20                 :             : #include "catalog/pg_class.h"
      21                 :             : #include "catalog/pg_rewrite.h"
      22                 :             : #include "rewrite/rewriteSupport.h"
      23                 :             : #include "utils/inval.h"
      24                 :             : #include "utils/lsyscache.h"
      25                 :             : #include "utils/syscache.h"
      26                 :             : 
      27                 :             : 
      28                 :             : /*
      29                 :             :  * Is there a rule by the given name?
      30                 :             :  */
      31                 :             : bool
      32                 :          17 : IsDefinedRewriteRule(Oid owningRel, const char *ruleName)
      33                 :             : {
      34                 :          17 :     return SearchSysCacheExists2(RULERELNAME,
      35                 :             :                                  ObjectIdGetDatum(owningRel),
      36                 :             :                                  PointerGetDatum(ruleName));
      37                 :             : }
      38                 :             : 
      39                 :             : 
      40                 :             : /*
      41                 :             :  * SetRelationRuleStatus
      42                 :             :  *      Set the value of the relation's relhasrules field in pg_class.
      43                 :             :  *
      44                 :             :  * NOTE: caller must be holding an appropriate lock on the relation.
      45                 :             :  *
      46                 :             :  * NOTE: an important side-effect of this operation is that an SI invalidation
      47                 :             :  * message is sent out to all backends --- including me --- causing relcache
      48                 :             :  * entries to be flushed or updated with the new set of rules for the table.
      49                 :             :  * This must happen even if we find that no change is needed in the pg_class
      50                 :             :  * row.
      51                 :             :  */
      52                 :             : void
      53                 :       11929 : SetRelationRuleStatus(Oid relationId, bool relHasRules)
      54                 :             : {
      55                 :             :     Relation    relationRelation;
      56                 :             :     HeapTuple   tuple;
      57                 :             :     Form_pg_class classForm;
      58                 :             : 
      59                 :             :     /*
      60                 :             :      * Find the tuple to update in pg_class, using syscache for the lookup.
      61                 :             :      */
      62                 :       11929 :     relationRelation = table_open(RelationRelationId, RowExclusiveLock);
      63                 :       11929 :     tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
      64         [ -  + ]:       11929 :     if (!HeapTupleIsValid(tuple))
      65         [ #  # ]:           0 :         elog(ERROR, "cache lookup failed for relation %u", relationId);
      66                 :       11929 :     classForm = (Form_pg_class) GETSTRUCT(tuple);
      67                 :             : 
      68         [ +  + ]:       11929 :     if (classForm->relhasrules != relHasRules)
      69                 :             :     {
      70                 :             :         /* Do the update */
      71                 :       11259 :         classForm->relhasrules = relHasRules;
      72                 :             : 
      73                 :       11259 :         CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
      74                 :             :     }
      75                 :             :     else
      76                 :             :     {
      77                 :             :         /* no need to change tuple, but force relcache rebuild anyway */
      78                 :         670 :         CacheInvalidateRelcacheByTuple(tuple);
      79                 :             :     }
      80                 :             : 
      81                 :       11929 :     heap_freetuple(tuple);
      82                 :       11929 :     table_close(relationRelation, RowExclusiveLock);
      83                 :       11929 : }
      84                 :             : 
      85                 :             : /*
      86                 :             :  * Find rule oid.
      87                 :             :  *
      88                 :             :  * If missing_ok is false, throw an error if rule name not found.  If
      89                 :             :  * true, just return InvalidOid.
      90                 :             :  */
      91                 :             : Oid
      92                 :         181 : get_rewrite_oid(Oid relid, const char *rulename, bool missing_ok)
      93                 :             : {
      94                 :             :     HeapTuple   tuple;
      95                 :             :     Form_pg_rewrite ruleform;
      96                 :             :     Oid         ruleoid;
      97                 :             : 
      98                 :             :     /* Find the rule's pg_rewrite tuple, get its OID */
      99                 :         181 :     tuple = SearchSysCache2(RULERELNAME,
     100                 :             :                             ObjectIdGetDatum(relid),
     101                 :             :                             PointerGetDatum(rulename));
     102         [ +  + ]:         181 :     if (!HeapTupleIsValid(tuple))
     103                 :             :     {
     104         [ +  + ]:          12 :         if (missing_ok)
     105                 :           4 :             return InvalidOid;
     106         [ +  - ]:           8 :         ereport(ERROR,
     107                 :             :                 (errcode(ERRCODE_UNDEFINED_OBJECT),
     108                 :             :                  errmsg("rule \"%s\" for relation \"%s\" does not exist",
     109                 :             :                         rulename, get_rel_name(relid))));
     110                 :             :     }
     111                 :         169 :     ruleform = (Form_pg_rewrite) GETSTRUCT(tuple);
     112                 :             :     Assert(relid == ruleform->ev_class);
     113                 :         169 :     ruleoid = ruleform->oid;
     114                 :         169 :     ReleaseSysCache(tuple);
     115                 :         169 :     return ruleoid;
     116                 :             : }
        

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