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Support for custom slots in the custom executor nodes

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Some custom table access method may have their tuple format and use custom
executor nodes for their custom scan types. The ability to set a custom slot
would save them from tuple format conversion. Other users of custom executor
nodes may also benefit.

Discussion: https://postgr.es/m/CAPpHfduJUU6ToecvTyRE_yjxTS80FyPpct4OHaLFk3OEheMTNA@mail.gmail.com
Author: Alexander Korotkov
Reviewed-by: Pavel Borisov
This commit is contained in:
Alexander Korotkov 2022-11-24 00:36:11 +03:00
parent b7a5ef17cf
commit cee1209514
2 changed files with 12 additions and 2 deletions
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13
src/backend/executor/nodeCustom.c
View File

@ -29,6 +29,7 @@ CustomScanState *
ExecInitCustomScan(CustomScan *cscan, EState *estate, int eflags)
{
CustomScanState *css;
const TupleTableSlotOps *slotOps;
Relation scan_rel = NULL;
Index scanrelid = cscan->scan.scanrelid;
int tlistvarno;
@ -63,6 +64,14 @@ ExecInitCustomScan(CustomScan *cscan, EState *estate, int eflags)
css->ss.ss_currentRelation = scan_rel;
}
/*
* Use a custom slot if specified in CustomScanState or use virtual slot
* otherwise.
*/
slotOps = css->slotOps;
if (!slotOps)
slotOps = &TTSOpsVirtual;
/*
* Determine the scan tuple type. If the custom scan provider provided a
* targetlist describing the scan tuples, use that; else use base
@ -73,14 +82,14 @@ ExecInitCustomScan(CustomScan *cscan, EState *estate, int eflags)
TupleDesc scan_tupdesc;
scan_tupdesc = ExecTypeFromTL(cscan->custom_scan_tlist);
ExecInitScanTupleSlot(estate, &css->ss, scan_tupdesc, &TTSOpsVirtual);
ExecInitScanTupleSlot(estate, &css->ss, scan_tupdesc, slotOps);
/* Node's targetlist will contain Vars with varno = INDEX_VAR */
tlistvarno = INDEX_VAR;
}
else
{
ExecInitScanTupleSlot(estate, &css->ss, RelationGetDescr(scan_rel),
&TTSOpsVirtual);
slotOps);
/* Node's targetlist will contain Vars with varno = scanrelid */
tlistvarno = scanrelid;
}

1
src/include/nodes/execnodes.h
View File

@ -1949,6 +1949,7 @@ typedef struct CustomScanState
List *custom_ps; /* list of child PlanState nodes, if any */
Size pscan_len; /* size of parallel coordination information */
const struct CustomExecMethods *methods;
const struct TupleTableSlotOps *slotOps;
} CustomScanState;
/* ----------------------------------------------------------------