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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@enterprisedb.com>
cc: Michael Paquier <michael.paquier@gmail.com>,
        Andrew Gierth <rhodiumtoad@postgresql.org>,
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Subject: Re: BUG #14808: V10-beta4, backend abort
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Comments: In-reply-to Thomas Munro <thomas.munro@enterprisedb.com>
	message dated "Tue, 12 Sep 2017 12:38:28 +1200"
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Date: Wed, 13 Sep 2017 18:44:02 -0400
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Thomas Munro <thomas.munro@enterprisedb.com> writes:
> Aside from the RI case, the other user visible change in behaviour
> will be for statements that update the same table via multiple
> ModifyTable nodes (wCTEs).  Our regression test has:

> with wcte as (insert into table1 values (42))
>   insert into table2 values ('hello world');

> ... which demonstrates the fix for the original complaint that table1
> and table2 earlier tried to use the same transition table (and
> crashed).

BTW, as I'm digging around in trigger.c, I can't help noticing that
it provides a single "fdw_tuplestore" per trigger query level (a/k/a
trigger execution context).  I've not tried to test this, but it
sure looks like a wCTE like your example above, directed at two
separate foreign tables with triggers, would fail for exactly the
same reason.  That'd be a bug of pretty long standing.

			regards, tom lane


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