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replace "32768 + 32767 + 1" with "65536" and improve comments

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Dull Bananas 2024-12-26 20:09:43 -07:00
parent 20e7fc92d5
commit d40d58389e
1 changed files with 3 additions and 3 deletions
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6
migrations/2024-12-18-200602_optimize_get_random_community/up.sql
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@ -1,4 +1,4 @@
-- * `smallint` range from https://www.postgresql.org/docs/17/datatype-numeric.html
-- * inclusive bounds of `smallint` range from https://www.postgresql.org/docs/17/datatype-numeric.html
-- * built-in `random` function has `VOLATILE` and `PARALLEL RESTRICTED` according to:
-- * https://www.postgresql.org/docs/current/parallel-safety.html#PARALLEL-LABELING
-- * https://www.postgresql.org/docs/17/xfunc-volatility.html
@ -7,8 +7,8 @@ CREATE FUNCTION random_smallint ()
LANGUAGE sql
VOLATILE PARALLEL RESTRICTED RETURN
-- https://stackoverflow.com/questions/1400505/generate-a-random-number-in-the-range-1-10/1400752#1400752
-- (`+ 1` makes the upper bound inclusive)
trunc ((random() * (32768 + 32767 + 1)) - 32768
-- (65536 = exclusive upper bound - inclusive lower bound)
trunc ((random() * (65536)) - 32768
);
ALTER TABLE community