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Generalize ri_RootToPartitionMap to use for non-partition children

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ri_RootToPartitionMap is currently only initialized for tuple routing
target partitions, though a future commit will need the ability to use
it even for the non-partition child tables, so make adjustments to the
decouple it from the partitioning code.

Also, make it lazily initialized via ExecGetRootToChildMap(), making
that function its preferred access path.  Existing third-party code
accessing it directly should no longer do so; consequently, it's been
renamed to ri_RootToChildMap, which also makes it consistent with
ri_ChildToRootMap.

ExecGetRootToChildMap() houses the logic of setting the map appropriately
depending on whether a given child relation is partition or not.

To support this, also add a separate entry point for TupleConversionMap
creation that receives an AttrMap.  No new code here, just split an
existing function in two.

Author: Amit Langote <amitlangote09@gmail.com>
Discussion: https://postgr.es/m/CA+HiwqEYUhDXSK5BTvG_xk=eaAEJCD4GS3C6uH7ybBvv+Z_Tmg@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2022-12-02 10:35:55 +01:00
parent 40b1491357
commit fb958b5da8
10 changed files with 107 additions and 52 deletions
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8
src/backend/executor/execMain.c
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@ -1256,9 +1256,11 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo,
* this field is filled in ExecInitModifyTable().
*/
resultRelInfo->ri_RootResultRelInfo = partition_root_rri;
resultRelInfo->ri_RootToPartitionMap = NULL; /* set by
* ExecInitRoutingInfo */
resultRelInfo->ri_PartitionTupleSlot = NULL; /* ditto */
/* Set by ExecGetRootToChildMap */
resultRelInfo->ri_RootToChildMap = NULL;
resultRelInfo->ri_RootToChildMapValid = false;
/* Set by ExecInitRoutingInfo */
resultRelInfo->ri_PartitionTupleSlot = NULL;
resultRelInfo->ri_ChildToRootMap = NULL;
resultRelInfo->ri_ChildToRootMapValid = false;
resultRelInfo->ri_CopyMultiInsertBuffer = NULL;