Ticket #15018: wp-includes-functions-meta-filter.patch

functions.php

@@ -4272 +4272 @@
 function _wp_meta_sql( $queries, $primary_table, $primary_id_column, $meta_table, $meta_id_column ) {
         global $wpdb;
 
+    $check = apply_filters('_wp_meta_sql', null, $queries, $primary_table, $primary_id_column, $meta_table, $meta_id_column);
+    if ( null !== $check )
+        return $check;
+
         $clauses = array();
 
         $join = '';