Horton

Re: using index or check in ALTER TABLE SET NOT NULL

Sergei Kornilov <sk@zsrv.org>

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From: Sergei Kornilov <sk@zsrv.org>
To: Tom Lane <tgl@sss.pgh.pa.us>, Robert Haas <robertmhaas@gmail.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>, PostgreSQL mailing lists <pgsql-hackers@postgresql.org>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Stephen Frost <sfrost@snowman.net>, Ildar Musin <i.musin@postgrespro.ru>
Date: 2019-03-13T15:17:21Z
Lists: pgsql-hackers 
Hi

> The buildfarm thinks additional nitpicking is needed.

hm. Patch was committed with debug1 level tests and many animals uses log_statement = 'all'. Therefore they have additional line in result: LOG:  statement: alter table pg_class alter column relname drop not null; and similar for other queries.
I think we better would be to revert "set client_min_messages to 'debug1';"  part.

regards, Sergei

Commits

  1. Avoid using INFO elevel for what are fundamentally debug messages.

  2. Revert setting client_min_messages to 'debug1' in new tests.

  3. Allow ALTER TABLE .. SET NOT NULL to skip provably unnecessary scans.

  4. Improve predtest.c's internal docs, and enhance its functionality a bit.