Add term_taxonomy_id field handling to WP_Tax_Query::transform_query(), allowing the transformation to be bypassed when tt ids are passed.

props wonderboymusic.
fixes #21228.



git-svn-id: http://core.svn.wordpress.org/trunk@21552 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy.php

@@ -790,7 +790,14 @@ class WP_Tax_Query {
 					AND $wpdb->terms.{$query['field']} IN ($terms)
 				" );
 				break;
-
+			case 'term_taxonomy_id':
+				$terms = implode( ',', array_map( 'intval', $query['terms'] ) );
+				$terms = $wpdb->get_col( "
+					SELECT $resulting_field
+					FROM $wpdb->term_taxonomy
+					WHERE term_taxonomy_id IN ($terms)
+				" );
+				break;
 			default:
 				$terms = implode( ',', array_map( 'intval', $query['terms'] ) );
 				$terms = $wpdb->get_col( "