Ticket #31045: meta.php.patch

meta.php

@@ -1351 +1351 @@
                 // We prefer to avoid joins if possible. Look for an existing join compatible with this clause.
                 $alias = $this->find_compatible_table_alias( $clause, $parent_query );
                 if ( false === $alias ) {
-                        $i = count( $this->table_aliases );
-                        $alias = $i ? 'mt' . $i : $this->meta_table;
+                        if( empty( $parent_query['alias'] ) ){
+                                $i = count( $this->table_aliases );
+                                $alias = $i ? 'mt' . $i : $this->meta_table;
+                        } else {
+                                $alias = $parent_query['alias'];        
+                        }
 
                         // JOIN clauses for NOT EXISTS have their own syntax.
                         if ( 'NOT EXISTS' === $meta_compare ) {