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Commit55416b2

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Guard against core dump from uninitialized subplan.
If the planner erroneously puts a non-parallel-safe SubPlan intoa parallelized portion of the query tree, nodeSubplan.c will failin the worker processes because it finds a null in es_subplanstates,which it's unable to cope with. It seems worth a test-and-elog tomake that an error case rather than a core dump case.This probably should have been included in commit16ebab6, whichwas responsible for allowing nulls to appear in es_subplanstatesto begin with. So, back-patch to v10 where that came in.Discussion:https://postgr.es/m/924226.1604422326@sss.pgh.pa.us
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‎src/backend/executor/nodeSubplan.c

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -798,7 +798,15 @@ ExecInitSubPlan(SubPlan *subplan, PlanState *parent)
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sstate->planstate= (PlanState*)list_nth(estate->es_subplanstates,
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subplan->plan_id-1);
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/* ... and to its parent's state */
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/*
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* This check can fail if the planner mistakenly puts a parallel-unsafe
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* subplan into a parallelized subquery; see ExecSerializePlan.
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*/
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if (sstate->planstate==NULL)
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elog(ERROR,"subplan \"%s\" was not initialized",
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subplan->plan_name);
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/* Link to parent's state, too */
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sstate->parent=parent;
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/* Initialize subexpressions */

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