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Slow "not in array" operation - Mailing list pgsql-performance
From
Marco Colli
Subject
Slow "not in array" operation
Date
November 12, 2019
20:29:31
Msg-id
CAFvCgN73NJbSdtCFvcD3=Hh+xGipDkUk+H4uzubQXx2rncQJ+w@mail.gmail.com
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Re: Slow "not in array" operation
(Michael Lewis <mlewis@entrata.com>)
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I have a large table with millions of rows. Each row has an array field "tags". I also have the proper GIN index on tags.
Counting the rows that have a tag is fast (~7s):
SELECT COUNT(*) FROM "subscriptions" WHERE (tags @> ARRAY['t1']::varchar[]);
However counting the rows that don't have a tag is extremely slow (~70s):
SELECT COUNT(*) FROM "subscriptions" WHERE NOT (tags @> ARRAY['t1']::varchar[]);
I have also tried other variants, but with the same results (~70s):
SELECT COUNT(*) FROM "subscriptions" WHERE NOT ('t1' = ANY (tags));
How can I make the "not in array" operation fast?
Any help would be appreciated, thank you!
Marco Colli
PostgreSQL 11 on Ubuntu 18LTS
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