NotificationsYou must be signed in to change notification settings
Fork28
Star153

Commitc6755e2

committed

Teach bitmap heap scan to cope with absence of a DSA.

If we have a plan that uses parallelism but are unable to execute itusing parallelism, for example due to a lack of available DSMsegments, then the EState's es_query_dsa will be NULL. Parallelbitmap heap scan needs to fall back to a non-parallel scan in suchcases.Patch by me, reviewed by Dilip KumarDiscussion:http://postgr.es/m/CAEepm=0kADK5inNf_KuemjX=HQ=PuTP0DykM--fO5jS5ePVFEA@mail.gmail.com

1 parente42e2f3 commitc6755e2Copy full SHA for c6755e2

File tree

1 file changed

+11

-0

lines changed

src/backend/executor
- nodeBitmapHeapscan.c

1 file changed

+11

-0

lines changed

`‎src/backend/executor/nodeBitmapHeapscan.c‎`

Lines changed: 11 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1051,6 +1051,11 @@ ExecBitmapHeapInitializeDSM(BitmapHeapScanState *node,`
`1051`	`1051`	`{`
`1052`	`1052`	`ParallelBitmapHeapState*pstate;`
`1053`	`1053`	`EState*estate=node->ss.ps.state;`
	`1054`	`+dsa_area*dsa=node->ss.ps.state->es_query_dsa;`
	`1055`	`+`
	`1056`	`+/* If there's no DSA, there are no workers; initialize nothing. */`
	`1057`	`+if (dsa==NULL)`
	`1058`	`+return;`
`1054`	`1059`
`1055`	`1060`	`pstate=shm_toc_allocate(pcxt->toc,node->pscan_len);`
`1056`	`1061`
`@@ -1083,6 +1088,10 @@ ExecBitmapHeapReInitializeDSM(BitmapHeapScanState *node,`
`1083`	`1088`	`ParallelBitmapHeapState*pstate=node->pstate;`
`1084`	`1089`	`dsa_area*dsa=node->ss.ps.state->es_query_dsa;`
`1085`	`1090`
	`1091`	`+/* If there's no DSA, there are no workers; do nothing. */`
	`1092`	`+if (dsa==NULL)`
	`1093`	`+return;`
	`1094`	`+`
`1086`	`1095`	`pstate->state=BM_INITIAL;`
`1087`	`1096`
`1088`	`1097`	`if (DsaPointerIsValid(pstate->tbmiterator))`
`@@ -1108,6 +1117,8 @@ ExecBitmapHeapInitializeWorker(BitmapHeapScanState *node,`
`1108`	`1117`	`ParallelBitmapHeapState*pstate;`
`1109`	`1118`	`Snapshotsnapshot;`
`1110`	`1119`
	`1120`	`+Assert(node->ss.ps.state->es_query_dsa!=NULL);`
	`1121`	`+`
`1111`	`1122`	`pstate=shm_toc_lookup(pwcxt->toc,node->ss.ps.plan->plan_node_id, false);`
`1112`	`1123`	`node->pstate=pstate;`
`1113`	`1124`

0 commit comments

Comments

(0)

Movatterモバイル変換

Navigation Menu

Search code, repositories, users, issues, pull requests...

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Commitc6755e2

File tree

1 file changed

1 file changed

`‎src/backend/executor/nodeBitmapHeapscan.c‎`

0 commit comments