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Commitedd4473

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Be lazier about partition tuple routing.
It's not necessary to fully initialize the executor data structuresfor partitions to which no tuples are ever routed. Consider, forexample, an INSERT statement that inserts only one row: it only caresabout the partition to which that one row is routed. The new functionExecInitPartitionInfo performs the initialization in question onlywhen a particular partition is about to receive a tuple. This includescreating, validating, and saving a pointer to the ResultRelInfo,setting up for speculative insertions, translating WCOs andinitializing the resulting expressions, translating returning listsand building the appropriate projection information, and setting up atuple conversion map.One thing that's not deferred is locking the child partitions; thatseems desirable but would need more thought. Still, testing showsthat this makes single-row inserts significantly faster on a tablewith many partitions without harming the bulk-insert case.Amit Langote, reviewed by Etsuro Fujita, with a few changes by meDiscussion:http://postgr.es/m/8975331d-d961-cbdd-f862-fdd3d97dc2d0@lab.ntt.co.jp
1 parent810e7e2 commitedd4473

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‎src/backend/commands/copy.c

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2469,7 +2469,7 @@ CopyFrom(CopyState cstate)
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PartitionTupleRouting*proute;
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proute=cstate->partition_tuple_routing=
2472-
ExecSetupPartitionTupleRouting(NULL,cstate->rel,1,estate);
2472+
ExecSetupPartitionTupleRouting(NULL,cstate->rel);
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/*
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* If we are capturing transition tuples, they may need to be
@@ -2606,6 +2606,14 @@ CopyFrom(CopyState cstate)
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*/
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saved_resultRelInfo=resultRelInfo;
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resultRelInfo=proute->partitions[leaf_part_index];
2609+
if (resultRelInfo==NULL)
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{
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resultRelInfo=ExecInitPartitionInfo(NULL,
2612+
saved_resultRelInfo,
2613+
proute,estate,
2614+
leaf_part_index);
2615+
Assert(resultRelInfo!=NULL);
2616+
}
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/* We do not yet have a way to insert into a foreign partition */
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if (resultRelInfo->ri_FdwRoutine)

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