Ticket #18158: 18158.2.diff

wp-includes/meta.php

@@ -724 +724 @@
                         $join[$i] .= $i ? " AS $alias" : '';
                         $join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
 
+                        if( in_array( strtoupper( $q['compare'] ), array( 'EXISTS', 'NOT EXISTS' ) ) ) {
+                                $join[$i]  = "LEFT JOIN $meta_table";
+                                $join[$i] .= $i ? " AS $alias" : '';
+                                $join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column AND $alias.meta_key = '$meta_key')";
+
+                                $where[$k] = ' ' . $alias . '.' . $meta_id_column . ' IS ' . ( ( strtoupper( $q['compare'] ) == 'EXISTS' ) ? 'NOT' : '' ) . ' NULL ';
+                                
+                                continue;
+                        }
+
                         $where[$k] = '';
                         if ( !empty( $meta_key ) )
                                 $where[$k] = $wpdb->prepare( "$alias.meta_key = %s", $meta_key );