- a group index may end with the entity ID column (post_id, ...)
- flat-first rewrites the posts.ID tie-breaks once, in the sort's direction:
with a (column, post_id) index MySQL returns rows in order instead of
sorting the whole match. dev36 (1.3M listings), price range sorted by price:
850 ms filesort -> 2 ms. Ties are ordered by ID the same way as the column
(natively ID DESC); pagination stays stable, result sets are unchanged
- Verify: EntityRegistryIndexesTest, PostQueryRouterFoundRowsTest (ASC
tie-break, single tie-break), unit 704, integration 589, phpcs, stan;
dev36 with the HivePress indexes (PR-119)
- PR: PR-118
wpdev
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