public inbox for [email protected]
help / color / mirror / Atom feedFrom: Richard Guo <[email protected]>
To: PostgreSQL-development <[email protected]>
Subject: A failure in prepared_xacts test
Date: Mon, 29 Apr 2024 09:12:48 +0800
Message-ID: <CAMbWs4-mWCGbbE_bne5=AfqjYGDaUZmjCw2+soLjrdNA0xUDFw@mail.gmail.com> (raw)
Yesterday I noticed a failure on cirrus-ci for the 'Right Semi Join'
patch. The failure can be found at [1], and it looks like:
--- /tmp/cirrus-ci-build/src/test/regress/expected/prepared_xacts.out
2024-04-27 00:41:25.831297000 +0000
+++
/tmp/cirrus-ci-build/build/testrun/regress-running/regress/results/prepared_xacts.out
2024-04-27 00:45:50.261369000 +0000
@@ -83,8 +83,9 @@
SELECT gid FROM pg_prepared_xacts;
gid
------
+ gxid
foo3
-(1 row)
+(2 rows)
Upon closer look, it seems that this issue is not caused by the patch
about 'Right Semi Join', because this query, which initially included
two left joins, can actually be reduced to a function scan after
removing these two useless left joins. It seems that no semi-joins
would be involved.
EXPLAIN SELECT gid FROM pg_prepared_xacts;
QUERY PLAN
----------------------------------------------------------------------------
Function Scan on pg_prepared_xact p (cost=0.00..10.00 rows=1000 width=32)
(1 row)
Does anyone have any clue to this failure?
FWIW, after another run of this test, the failure just disappears. Does
it suggest that the test case is flaky?
[1]
https://api.cirrus-ci.com/v1/artifact/task/6220592364388352/testrun/build/testrun/regress-running/re...
Thanks
Richard
view thread (3+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected]
Subject: Re: A failure in prepared_xacts test
In-Reply-To: <CAMbWs4-mWCGbbE_bne5=AfqjYGDaUZmjCw2+soLjrdNA0xUDFw@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox