bed3f906da
- meta_key is routed as EXISTS only when no orderby entry names meta_value, meta_value_num or the key (several orderings or an array included); clearing it made WordPress drop the price ordering - A sort group is dropped as unused only when orderby names neither it, meta_value(_num) nor its key (it is then the primary clause) - meta_compare_key other than '=' keeps meta_key native (LIKE matches other keys) - Found in the 2.4 correctness review (regressions from PR-122) - Verify: PostQueryRouterTest (3 new), router suites 67 OK - PR: PR-130