wp-includes/class-wp-meta-query.php:830Identifies an existing table alias that is compatible with the current query clause.
$clausearray$parent_queryarraystring|falseOne hook fires while WP_Meta_Query::find_compatible_table_alias() runs, in this order:
Filters the table alias identified as compatible with the current clause.
protected function find_compatible_table_alias( $clause, $parent_query ) { $alias = false; foreach ( $parent_query as $sibling ) { // If the sibling has no alias yet, there's nothing to check. if ( empty( $sibling['alias'] ) ) { continue; } // We're only interested in siblings that are first-order clauses. if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) { continue; } $compatible_compares = array(); // Clauses connected by OR can share joins as long as they have "positive" operators. if ( 'OR' === $parent_query['relation'] ) { $compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' ); // Clauses joined by AND with "negative" operators share a join only if they also share a key. } elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) { $compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' ); } $clause_compare = strtoupper( $clause['compare'] ); $sibling_compare = strtoupper( $sibling['compare'] ); if ( in_array( $clause_compare, $compatible_compares, true ) && in_array( $sibling_compare, $compatible_compares, true ) ) { $alias = preg_replace( '/\W/', '_', $sibling['alias'] ); break; } } /** * Filters the table alias identified as compatible with the current clause. * * @since 4.1.0 * * @param string|false $alias Table alias, or false if none was found. * @param array $clause First-order query clause. * @param array $parent_query Parent of $clause. * @param WP_Meta_Query $query WP_Meta_Query object. */ return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ); }Introduced in 4.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-meta-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.