Changeset 15580 for trunk/wp-includes/functions.php

Timestamp:

09/06/2010 11:04:50 AM (14 years ago)

Author:

scribu

Message:

Use multiple JOINs instead of CASE in _wp_meta_sql(). See #14572

File:

• trunk/wp-includes/functions.php (modified) (2 diffs)

trunk/wp-includes/functions.php

@@ -4244 +4244 @@
  *
  * @param array $queries An array of queries
- * @param string $meta_id_column The column that holds the object id
- * @return string
- */
-function _wp_meta_sql( $queries, $meta_id_column ) {
+ * @param string $primary_table
+ * @param string $primary_id_column
+ * @param string $meta_table
+ * @param string $meta_id_column
+ * @return array( $join_sql, $where_sql )
+ */
+function _wp_meta_sql( $queries, $primary_table, $primary_id_column, $meta_table, $meta_id_column ) {
     global $wpdb;
 
@@ -4263 +4266 @@
             continue;
 
-        $clause = $wpdb->prepare( "WHEN %s THEN meta_value ", $meta_key );
-
         if ( empty( $meta_value ) ) {
-            $clauses[] = $clause . "IS NOT NULL";
+            $clauses[ $meta_key ] = "";
         } elseif ( 'like' == $meta_compare ) {
-            $clauses[] = $clause . $wpdb->prepare( "LIKE %s", '%' . like_escape( $meta_value ) . '%' );
+            $clauses[ $meta_key ] = $wpdb->prepare( "LIKE %s", '%' . like_escape( $meta_value ) . '%' );
         } else {
-            $clauses[] = $clause . $wpdb->prepare( "$meta_compare %s", $meta_value );
+            $clauses[ $meta_key ] = $wpdb->prepare( "$meta_compare %s", $meta_value );
         }
     }
 
     if ( empty( $clauses ) )
-        return '';
-
-    return "
-        AND CASE meta_key 
-        " . implode( "\n", $clauses ) . "
-        END
-        GROUP BY $meta_id_column
-        HAVING COUNT(*) = " . count( $clauses );
-}
-
+        return array('', '');
+
+    $join = '';
+    $where = '';
+
+    $i = 0;
+    foreach ( $clauses as $meta_key => $value_query ) {
+        $alias = $i ? 'mt' . $i : $meta_table;
+
+        $join .= "\nINNER JOIN $meta_table";
+        $join .= $i ? " AS $alias" : '';
+        $join .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
+
+        $where .= $wpdb->prepare( " AND $alias.meta_key = %s", $meta_key );
+        if ( !empty( $value_query ) )
+            $where .= " AND $alias.meta_value $value_query";
+            
+        $i++;
+    }
+
+    return array( $join, $where );
+}
 
 /*