From a3322283266d2115d082720d97fed29835bc25d0 Mon Sep 17 00:00:00 2001
From: Steven Wittens <steven@10.no-reply.drupal.org>
Date: Sat, 22 Jan 2005 22:33:20 +0000
Subject: Documenting a tricky regexp.

---
 modules/node.module | 1 +
 1 file changed, 1 insertion(+)

(limited to 'modules/node.module')

diff --git a/modules/node.module b/modules/node.module
index 8c021ad52..29000edce 100644
--- a/modules/node.module
+++ b/modules/node.module
@@ -1864,6 +1864,7 @@ function _node_rewrite_sql($query = '', $nid_alias = 'n', $args = array()) {
 function node_rewrite_sql($query, $nid_alias = 'n', $args = array()) {
   list($join, $where, $nid_to_select) = _node_rewrite_sql($query, $nid_alias, $args);
 
+  // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
   $query = preg_replace('/(SELECT.*)('. $nid_alias .'\.)?(?<!DISTINCT\()(?<!DISTINCT\('. $nid_alias .'\.)nid(.*FROM)/AUsi', '\1'. $nid_to_select .'\3', $query);
 
   $query = preg_replace('|FROM[^[:upper:]/,]+|','\0 '. $join .' ', $query);
-- 
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