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Postpone some more stuff out of ExecInitModifyTable.

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Delay creation of the projections for INSERT and UPDATE tuples
until they're needed.  This saves a pretty fair amount of work
when only some of the partitions are actually touched.

The logic associated with identifying junk columns in UPDATE/DELETE
is moved to another loop, allowing removal of one loop over the
target relations; but it didn't actually change at all.

Extracted from a larger patch, which seemed to me to be too messy
to push in one commit.

Amit Langote, reviewed at different times by Heikki Linnakangas and
myself

Discussion: https://postgr.es/m/CA+HiwqG7ZruBmmih3wPsBZ4s0H2EhywrnXEduckY5Hr3fWzPWA@mail.gmail.com
This commit is contained in:
Tom Lane
2021-04-06 18:13:05 -04:00
parent 3b82d990ab
commit a1115fa078
3 changed files with 210 additions and 158 deletions
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1
src/backend/executor/execMain.c
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@ -1221,6 +1221,7 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo,
resultRelInfo->ri_projectNew = NULL;
resultRelInfo->ri_newTupleSlot = NULL;
resultRelInfo->ri_oldTupleSlot = NULL;
resultRelInfo->ri_projectNewInfoValid = false;
resultRelInfo->ri_FdwState = NULL;
resultRelInfo->ri_usesFdwDirectModify = false;
resultRelInfo->ri_ConstraintExprs = NULL;