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only call random_smallint once for filter

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Dull Bananas 2024-12-17 17:19:21 -07:00
parent bd020ebb0f
commit 77aea3362e
1 changed files with 5 additions and 1 deletions
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6
crates/db_schema/src/impls/community.rs
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@ -252,7 +252,11 @@ impl Community {
.filter(
community::id.nullable().eq(coalesce_2_nullable(
try_pick()
.filter(community::random_number.ge(random_smallint()))
.filter(community::random_number.nullable().ge(
// Without `select` and `single_value`, this would call `random_smallint` separately
// for each row
select(random_smallint()).single_value(),
))
.single_value(),
// Wrap to the beginning if the generated number is higher than all
// `community::random_number` values, just like in the MediaWiki algorithm