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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

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src/backend/executor
- nodeBitmapHeapscan.c

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`‎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`

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`‎src/backend/executor/nodeBitmapHeapscan.c`

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