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21 lines
924 B
MySQL
21 lines
924 B
MySQL
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-- * inclusive bounds of `smallint` range from https://www.postgresql.org/docs/17/datatype-numeric.html
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-- * built-in `random` function has `VOLATILE` and `PARALLEL RESTRICTED` according to:
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-- * https://www.postgresql.org/docs/current/parallel-safety.html#PARALLEL-LABELING
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-- * https://www.postgresql.org/docs/17/xfunc-volatility.html
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CREATE FUNCTION random_smallint ()
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RETURNS smallint
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LANGUAGE sql
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VOLATILE PARALLEL RESTRICTED RETURN
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-- https://stackoverflow.com/questions/1400505/generate-a-random-number-in-the-range-1-10/1400752#1400752
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-- (65536 = exclusive upper bound - inclusive lower bound)
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trunc ((random() * (65536)) - 32768
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);
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ALTER TABLE community
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ADD COLUMN random_number smallint NOT NULL DEFAULT random_smallint ();
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CREATE INDEX idx_community_random_number ON community (random_number) INCLUDE (local, nsfw)
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WHERE
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NOT (deleted OR removed OR visibility = 'Private');
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