Do not return duplicate posts for Meta Queries. Props Greuben. Fixes …

…#17264 for 3.1

git-svn-id: http://svn.automattic.com/wordpress/branches/3.1@17805 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/query.php

@@ -2231,10 +2231,6 @@ function &get_posts() {
 			}
 		}
 
-		if ( !empty( $this->tax_query->queries ) || !empty( $q['meta_key'] ) ) {
-			$groupby = "{$wpdb->posts}.ID";
-		}
-
 		// Author/user stuff
 
 		if ( empty($q['author']) || ($q['author'] == '0') ) {
@@ -2480,6 +2476,10 @@ function &get_posts() {
 			$where .= $clauses['where'];
 		}
 
+		if ( ! empty( $this->tax_query->queries ) || ! empty( $q['meta_query'] ) ) {
+			$groupby = "{$wpdb->posts}.ID";
+		}
+
 		// Apply filters on where and join prior to paging so that any
 		// manipulations to them are reflected in the paging by day queries.
 		if ( !$q['suppress_filters'] ) {