84f6e32913
- A sort-only search (HivePress _sort, no routed filter) LEFT JOINs the flat table to keep posts without a row; it now drives from the flat table (STRAIGHT_JOIN, INNER JOIN) when every post of the type has a flat row. The router gives a new post of a type with its own groups an empty row (wp_insert_post); coverage is one anti-join per group, cached 15 min and per post-mode change (forget_coverage()). - A flat-first search drops the GROUP BY posts.ID WordPress adds for any tax query when the flat row is the only join (WooCommerce's product_visibility NOT IN on searches is a subquery); a joining tax query keeps it. - Verify: live router suite (5 new cases, RED before); dev36 rating__desc page, ids identical: native ~3.3 s, 2.1 routing ~1.5–1.9 s, now ~0.51–0.85 s (main query 440 → 46 ms, COUNT 400 → 160 ms). p50 ≤ 300 ms is still not met: page rendering and HivePress's own get_posts() in pre_get_posts (suppress_filters, ~100 ms) remain. - PR: PR-079