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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andreas Seltenreich <seltenreich@gmx.de>
cc: pgsql-hackers@postgresql.org
Subject: Re: [sqlsmith] Failed assertion in adjust_appendrel_attrs_mutator
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Comments: In-reply-to Andreas Seltenreich <seltenreich@gmx.de>
	message dated "Sun, 22 Oct 2017 18:49:22 +0200"
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Date: Sun, 22 Oct 2017 13:07:03 -0400
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Andreas Seltenreich <seltenreich@gmx.de> writes:
> testing master as of 7c981590c2, sqlsmith just triggered the following
> assertion:
> TRAP: FailedAssertion("!(!((((const Node*)(node))->type) =3D=3D T_SubLink=
))", File: "prepunion.c", Line: 2231)

Hmm.  adjust_appendrel_attrs() thinks it's only used after conversion
of sublinks to subplans, but this is a counterexample.  I wonder if
that assumption was ever correct?  Or maybe we need to rethink what
it does when recursing into RTE subqueries.

			regards, tom lane


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