Parallel Append subplan order instability on aye-aye

From: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
To: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Parallel Append subplan order instability on aye-aye
Date: 2019-05-20 03:36:29
Message-ID: CA+hUKG+0CxrKRWRMf5ymN3gm+BECHna2B-q1w8onKBep4HasUw@mail.gmail.com
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Hi,

Here's a one-off regression test failure of a sort that commit
624e440a intended to fix. a_star unexpectedly sorted higher. I
checked the space weather forecast for this morning but no sign of
solar flares. More seriously, it did the same in all 3 Parallel
Append queries. Recent commits look irrelevant. Could a UDP stats
packet dropped on the floor cause that? Otherwise maybe you'd need a
weird result from FileSize() to explain it. Based on log output no
other tests ran around the same time.

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=aye-aye&dt=2019-05-19%2018%3A30%3A10

--
Thomas Munro
https://enterprisedb.com

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