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Postpone some more stuff out of ExecInitModifyTable.
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
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‎src/backend/executor/execMain.c

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Original file line numberDiff line numberDiff line change
@@ -1221,6 +1221,7 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo,
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resultRelInfo->ri_projectNew = NULL;
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resultRelInfo->ri_newTupleSlot = NULL;
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resultRelInfo->ri_oldTupleSlot = NULL;
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resultRelInfo->ri_projectNewInfoValid = false;
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resultRelInfo->ri_FdwState = NULL;
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resultRelInfo->ri_usesFdwDirectModify = false;
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resultRelInfo->ri_ConstraintExprs = NULL;

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