Ticket #24093: 24093.4.patch

meta.php

@@ -1036 +1036 @@
                                 $meta_compare = '=';
 
                         $i = count( $join );
-                        $alias = $i ? 'mt' . $i : $meta_table;
+                        $alias = $i ? 'mt' . $i : 'mt0';
 
                         if ( 'NOT EXISTS' == $meta_compare ) {
                                 $join[$i]  = "LEFT JOIN $meta_table";
-                                $join[$i] .= $i ? " AS $alias" : '';
+                                $join[$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 NULL';
@@ -1048 +1048 @@
                                 continue;
                         }
 
-                        $join[$i]  = "INNER JOIN $meta_table";
-                        $join[$i] .= $i ? " AS $alias" : '';
-                        $join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
-
+                        if ( !$i ) { 
+                                $join[$i]  = "INNER JOIN $meta_table"; 
+                                $join[$i] .= $i ? " AS $alias" : ' AS mt0'; 
+                                $join[$i] .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)"; 
+                        } 
+                        
                         $where[$k] = '';
                         if ( !empty( $meta_key ) )
                                 $where[$k] = $wpdb->prepare( "$alias.meta_key = %s", $meta_key );
@@ -1089 +1091 @@
                         if ( ! empty( $where[$k] ) )
                                 $where[$k] .= ' AND ';
 
-                        $where[$k] = ' (' . $where[$k] . $wpdb->prepare( "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string})", $meta_value );
+                        $where[$k] = ' ' . $primary_table . '.' . $primary_id_column . ' IN ('  
+                                        . ' SELECT ' . $meta_id_column  
+                                        . ' FROM ' . $meta_table . ' AS ' . $alias  
+                                        . ' WHERE ' . $where[$k] . $wpdb->prepare( "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string}", $meta_value ) 
+                                        . ')';  
                 }
 
                 $where = array_filter( $where );

query.php

@@ -2255 +2255 @@
                                 $type = $this->get( 'meta_type' );
                                 if ( ! empty( $type ) ) {
                                         $meta_type = $this->meta_query->get_cast_for_type( $type );
-                                        $orderby = "CAST($wpdb->postmeta.meta_value AS {$meta_type})";
+                                        $orderby = "CAST(mt0.meta_value AS {$meta_type})";
                                 } else {
-                                        $orderby = "$wpdb->postmeta.meta_value";
+                                        $orderby = "mt0.meta_value";
                                 }
                                 break;
                         case 'meta_value_num':
-                                $orderby = "$wpdb->postmeta.meta_value+0";
+                                $orderby = "mt0.meta_value+0";
                                 break;
                         default:
                                 $orderby = "$wpdb->posts.post_" . $orderby;