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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <rhaas@postgresql.org>
cc: pgsql-committers@postgresql.org
Subject: Re: pgsql: Fix mistaken failure to allow parallelism in corner case.
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Comments: In-reply-to Robert Haas <rhaas@postgresql.org>
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Date: Fri, 27 Oct 2017 10:19:34 -0400
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Robert Haas <rhaas@postgresql.org> writes:
> Fix mistaken failure to allow parallelism in corner case.

You can't insert fields into the middle of a widely-known struct
in the back branches.  In v10, this broke ABI compatibility for
any extension touching estate->es_query_dsa, which seems unlikely
to be the empty set.

			regards, tom lane


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