From 0f3921f7713b1866e7992e39c46bb640282d748d Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Mon, 18 Apr 2011 20:38:59 +0000
Subject: [PATCH] More efficient term intersection query. Props tigertech. see
 #16706

git-svn-id: https://develop.svn.wordpress.org/trunk@17652 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/taxonomy.php | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 33d4329deb..eab8d19703 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -694,12 +694,12 @@ class WP_Tax_Query {
 
 				$terms = implode( ',', $terms );
 
-				$where[] = "$primary_table.$primary_id_column IN (
-					SELECT object_id
+				$where[] = "(
+					SELECT COUNT(1)
 					FROM $wpdb->term_relationships
 					WHERE term_taxonomy_id IN ($terms)
-					GROUP BY object_id HAVING COUNT(object_id) = $num_terms
-				)";
+					AND object_id = $primary_table.$primary_id_column
+				) = $num_terms";
 			}
 
 			$i++;