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Fix MERGE command tag for actions blocked by BEFORE ROW triggers.

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This ensures that the row count in the command tag for a MERGE is
correctly computed in the case where UPDATEs or DELETEs are skipped
due to a BEFORE ROW trigger returning NULL (the INSERT case was
already handled correctly by ExecMergeNotMatched() calling
ExecInsert()).

Back-patch to v15, where MERGE was introduced.

Discussion: https://postgr.es/m/CAEZATCU8XEmR0JWKDtyb7iZ%3DqCffxS9uyJt0iOZ4TV4RT%2Bow1w%40mail.gmail.com
This commit is contained in:
Dean Rasheed
2023-03-13 11:11:10 +00:00
parent 7d9a75713a
commit da6257eee3
3 changed files with 34 additions and 4 deletions
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10
src/backend/executor/nodeModifyTable.c
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@@ -2867,8 +2867,9 @@ lmerge_matched:;
if (!ExecUpdatePrologue(context, resultRelInfo,
tupleid, NULL, newslot, &result))
{
/* Blocked by trigger, or concurrent update/delete */
break;
if (result == TM_Ok)
return true; /* "do nothing" */
break; /* concurrent update/delete */
}
result = ExecUpdateAct(context, resultRelInfo, tupleid, NULL,
newslot, false, &updateCxt);
@@ -2885,8 +2886,9 @@ lmerge_matched:;
if (!ExecDeletePrologue(context, resultRelInfo, tupleid,
NULL, NULL, &result))
{
/* Blocked by trigger, or concurrent update/delete */
break;
if (result == TM_Ok)
return true; /* "do nothing" */
break; /* concurrent update/delete */
}
result = ExecDeleteAct(context, resultRelInfo, tupleid, false);
if (result == TM_Ok)