Re: Multivariate MCV lists -- pg_mcv_list_items() seems to be broken
От | Tomas Vondra |
---|---|
Тема | Re: Multivariate MCV lists -- pg_mcv_list_items() seems to be broken |
Дата | |
Msg-id | 20190415162144.7orp5y5abrdglouf@development обсуждение исходный текст |
Ответ на | Multivariate MCV lists -- pg_mcv_list_items() seems to be broken (Dean Rasheed <dean.a.rasheed@gmail.com>) |
Список | pgsql-hackers |
On Mon, Apr 15, 2019 at 05:02:43PM +0100, Dean Rasheed wrote: >I just noticed the following: > >CREATE TABLE foo (a int, b int); >INSERT INTO foo SELECT x/10, x/100 FROM generate_series(1, 100) x; >CREATE STATISTICS foo_s ON a,b FROM foo; >ANALYSE foo; > >SELECT pg_mcv_list_items(stxmcv) from pg_statistic_ext WHERE stxname = 'foo_s'; > >which fails with > >ERROR: cache lookup failed for type 0 > >That definitely used to work, so I'm guessing it got broken by the >recent reworking of the serialisation code, but I've not looked into >it. > Yeah, that seems like a bug. I'll take a look. >There should probably be regression test coverage of that function. > Agreed. I plan to rework the existing tests to use the same approach as the MCV, so I'll add a test for this function too. regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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