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Fix MERGE command tag for cross-partition updates.

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This ensures that the row count in the command tag for a MERGE is
correctly computed. Previously, if MERGE updated a partitioned table,
the row count would be incorrect if any row was moved to a different
partition, since such updates were counted twice.

Back-patch to v15, where MERGE was introduced.

Discussion: https://postgr.es/m/CAEZATCWRMG7XX2QEsVL1LswmNo2d_YG8tKTLkpD3=Lp644S7rg@mail.gmail.com
This commit is contained in:
Dean Rasheed
2023-02-22 09:41:28 +00:00
parent fa5dd460c1
commit 018af1cc1c
3 changed files with 28 additions and 1 deletions
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2
src/backend/executor/nodeModifyTable.c
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@@ -2889,7 +2889,7 @@ lmerge_matched:;
}
ExecUpdatePrepareSlot(resultRelInfo, newslot, context->estate);
result = ExecUpdateAct(context, resultRelInfo, tupleid, NULL,
newslot, mtstate->canSetTag, &updateCxt);
newslot, false, &updateCxt);
if (result == TM_Ok && updateCxt.updated)
{
ExecUpdateEpilogue(context, &updateCxt, resultRelInfo,