| From: | Mark Rofail <markm(dot)rofail(at)gmail(dot)com> |
|---|---|
| To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
| Cc: | Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andreas Karlsson <andreas(at)proxel(dot)se>, David Steele <david(at)pgmasters(dot)net>, Erik Rijkers <er(at)xs4all(dot)nl>, Hans-Jürgen Schönig <hs(at)cybertec(dot)at>, Joel Jacobson <joel(at)compiler(dot)org>, Michael Paquier <michael(at)paquier(dot)xyz>, Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Zhihong Yu <zyu(at)yugabyte(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] GSoC 2017: Foreign Key Arrays |
| Date: | 2021-03-03 22:22:03 |
| Message-ID: | CAJvoCusu6Cxm+GYGSuVFBE2Px8VR-8PF25=NCAk-oZ1fs75EDQ@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hello Justin,
It doesn't just rebase: it also removes the test which was failing on
> windows
> CI:
>
My apologies, I didn’t include it in the changelog since this is not a code
change, just wanted to see if any other test would fail on the windows CI
I think the SELECT, when it works, is actually doing a seq scan and not
> using
> the index. On my PC, the index scan is used until an autovacuum/analyze
> run,
> after which it uses seqscan. I'm not sure how the other CIs all managed
> to run
> autovacuum between creating a table and running a query on it, though.
This is genius! That explains it. I have been racking my brain for two
weeks now and you figured it out.
I guess you should first run the query with "explain (costs off)" to show
> what
> plan it's using, and add things like "SET enable_seqscan=off" as needed to
> guarantee that everyone will use the same plan, regardless of minor cost
> differences and vacuum timing.
I think that will solve the test discrepancy.
Honestly Justin, hats off!
/Mark
>
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Andrew Dunstan | 2021-03-03 22:32:29 | Re: buildfarm windows checks / tap tests on windows |
| Previous Message | Andres Freund | 2021-03-03 22:21:31 | Re: Fix DROP TABLESPACE on Windows with ProcSignalBarrier? |