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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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19
src/backend/access/common/tupconvert.c
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@@ -102,9 +102,7 @@ TupleConversionMap *
convert_tuples_by_name(TupleDesc indesc,
TupleDesc outdesc)
{
TupleConversionMap *map;
AttrMap *attrMap;
int n = outdesc->natts;
/* Verify compatibility and prepare attribute-number map */
attrMap = build_attrmap_by_name_if_req(indesc, outdesc, false);
@@ -115,6 +113,23 @@ convert_tuples_by_name(TupleDesc indesc,
return NULL;
}
return convert_tuples_by_name_attrmap(indesc, outdesc, attrMap);
}
/*
* Set up tuple conversion for input and output TupleDescs using the given
* AttrMap.
*/
TupleConversionMap *
convert_tuples_by_name_attrmap(TupleDesc indesc,
TupleDesc outdesc,
AttrMap *attrMap)
{
int n = outdesc->natts;
TupleConversionMap *map;
Assert(attrMap != NULL);
/* Prepare the map structure */
map = (TupleConversionMap *) palloc(sizeof(TupleConversionMap));
map->indesc = indesc;