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Fix Parallel Append crash.

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Reported by Tom Lane and the buildfarm.

Amul Sul and Amit Khandekar

Discussion: http://postgr.es/m/17868.1512519318@sss.pgh.pa.us
Discussion: http://postgr.es/m/CAJ3gD9cJQ4d-XhmZ6BqM9rMM2KDBfpkdgOAb4+psz56uBuMQ_A@mail.gmail.com
This commit is contained in:
Robert Haas
2017-12-06 08:42:50 -05:00
parent 979a36c389
commit 9c64ddd414
1 changed files with 10 additions and 2 deletions
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12
src/backend/executor/nodeAppend.c
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@ -506,8 +506,16 @@ choose_next_subplan_for_worker(AppendState *node)
node->as_whichplan = pstate->pa_next_plan++; node->as_whichplan = pstate->pa_next_plan++;
if (pstate->pa_next_plan >= node->as_nplans) if (pstate->pa_next_plan >= node->as_nplans)
{ {
Assert(append->first_partial_plan < node->as_nplans); if (append->first_partial_plan < node->as_nplans)
pstate->pa_next_plan = append->first_partial_plan; pstate->pa_next_plan = append->first_partial_plan;
else
{
/*
* We have only non-partial plans, and we already chose the last
* one; so arrange for the other workers to immediately bail out.
*/
pstate->pa_next_plan = INVALID_SUBPLAN_INDEX;
}
} }
/* If non-partial, immediately mark as finished. */ /* If non-partial, immediately mark as finished. */