Re: [sqlsmith] Failed assertion in parallel worker (ExecInitSubPlan)

From: Andreas Seltenreich <seltenreich(at)gmx(dot)de>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [sqlsmith] Failed assertion in parallel worker (ExecInitSubPlan)
Date: 2016-05-22 16:02:14
Message-ID: 87eg8u6pyx.fsf@elite.ansel.ydns.eu
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Amit Kapila writes:

> avoid_restricted_clause_below_gather_v1.patch
> prohibit_parallel_clause_below_rel_v1.patch

I didn't observe any parallel worker related coredumps since applying
these. The same amount of testing done before applying them yielded
about a dozend.

Dilip Kumar writes:

> So now its clear that because of sub query pullup, we may get expression in
> targetlist while creating single table path list. So we need to avoid
> parallel plan if it contains expression.

This sounds like a rather heavy restriction though…

regards,
Andreas

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