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Add optimizer and executor support for parallel index-only scans.

Browse Source 
Commit 5262f7a4fc added similar support
for parallel index scans; this extends that work to index-only scans.
As with parallel index scans, this requires support from the index AM,
so currently parallel index-only scans will only be possible for btree
indexes.

Rafia Sabih, reviewed and tested by Rahila Syed, Tushar Ahuja,
and Amit Kapila

Discussion: http://postgr.es/m/CAOGQiiPEAs4C=TBp0XShxBvnWXuzGL2u++Hm1=qnCpd6_Mf8Fw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-02-19 15:53:59 +05:30
parent 16be2fd100
commit 0414b26bac
7 changed files with 191 additions and 26 deletions
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12
src/backend/executor/execParallel.c
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@ -29,6 +29,7 @@
#include "executor/nodeForeignscan.h"
#include "executor/nodeSeqscan.h"
#include "executor/nodeIndexscan.h"
#include "executor/nodeIndexonlyscan.h"
#include "executor/tqueue.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/planmain.h"
@ -202,6 +203,10 @@ ExecParallelEstimate(PlanState *planstate, ExecParallelEstimateContext *e)
ExecIndexScanEstimate((IndexScanState *) planstate,
e->pcxt);
break;
case T_IndexOnlyScanState:
ExecIndexOnlyScanEstimate((IndexOnlyScanState *) planstate,
e->pcxt);
break;
case T_ForeignScanState:
ExecForeignScanEstimate((ForeignScanState *) planstate,
e->pcxt);
@ -258,6 +263,10 @@ ExecParallelInitializeDSM(PlanState *planstate,
ExecIndexScanInitializeDSM((IndexScanState *) planstate,
d->pcxt);
break;
case T_IndexOnlyScanState:
ExecIndexOnlyScanInitializeDSM((IndexOnlyScanState *) planstate,
d->pcxt);
break;
case T_ForeignScanState:
ExecForeignScanInitializeDSM((ForeignScanState *) planstate,
d->pcxt);
@ -737,6 +746,9 @@ ExecParallelInitializeWorker(PlanState *planstate, shm_toc *toc)
case T_IndexScanState:
ExecIndexScanInitializeWorker((IndexScanState *) planstate, toc);
break;
case T_IndexOnlyScanState:
ExecIndexOnlyScanInitializeWorker((IndexOnlyScanState *) planstate, toc);
break;
case T_ForeignScanState:
ExecForeignScanInitializeWorker((ForeignScanState *) planstate,
toc);