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Commit886531f

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Use appropriate tuple descriptor in FDW batching
The FDW batching code was using the same tuple descriptor both for allslots (regular and plan slots), but that's incorrect - the subplan mayuse a different descriptor. Currently this is benign, because batchingis used only for INSERTs, and in that case the descriptors always match.But that would change if we allow batching UPDATEs.Fix by copying the appropriate tuple descriptor. Backpatch to 14, wherethe FDW batching was implemented.Author: Amit LangoteBackpatch-through: 14, where FDW batching was addedDiscussion:https://postgr.es/m/CA%2BHiwqEWd5B0-e-RvixGGUrNvGkjH2s4m95%3DJcwUnyV%3Df0rAKQ%40mail.gmail.com
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‎src/backend/executor/nodeModifyTable.c

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -709,17 +709,19 @@ ExecInsert(ModifyTableState *mtstate,
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* keep them across batches. To mitigate an inefficiency in how
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* resource owner handles objects with many references (as with
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* many slots all referencing the same tuple descriptor) we copy
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* the tuple descriptor for each slot.
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* theappropriatetuple descriptor for each slot.
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*/
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if (resultRelInfo->ri_NumSlots >=resultRelInfo->ri_NumSlotsInitialized)
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{
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TupleDesctdesc=CreateTupleDescCopy(slot->tts_tupleDescriptor);
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TupleDescplan_tdesc=
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CreateTupleDescCopy(planSlot->tts_tupleDescriptor);
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resultRelInfo->ri_Slots[resultRelInfo->ri_NumSlots]=
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MakeSingleTupleTableSlot(tdesc,slot->tts_ops);
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resultRelInfo->ri_PlanSlots[resultRelInfo->ri_NumSlots]=
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MakeSingleTupleTableSlot(tdesc,planSlot->tts_ops);
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MakeSingleTupleTableSlot(plan_tdesc,planSlot->tts_ops);
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/* remember how many batch slots we initialized */
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resultRelInfo->ri_NumSlotsInitialized++;

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