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Add check for syscache lookup failure in update_relispartition().

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Omitted in commit 05b38c7e6 (though it looks like the original blame
belongs to 9e9befac4).  A failure is admittedly unlikely, but if it
did happen, SIGSEGV is not the approved method of reporting it.

Per Coverity.  Back-patch to v11 where the broken code originated.
This commit is contained in:
Tom Lane 2019-05-05 12:44:32 -04:00
parent 506af101f3
commit 030ad0acfa
1 changed files with 2 additions and 1 deletions
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3
src/backend/commands/indexcmds.c
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@ -2682,10 +2682,11 @@ update_relispartition(Oid relationId, bool newval)
classRel = heap_open(RelationRelationId, RowExclusiveLock);
tup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for relation %u", relationId);
Assert(((Form_pg_class) GETSTRUCT(tup))->relispartition != newval);
((Form_pg_class) GETSTRUCT(tup))->relispartition = newval;
CatalogTupleUpdate(classRel, &tup->t_self, tup);
heap_freetuple(tup);
heap_close(classRel, RowExclusiveLock);
}