diff -u -r drupal-6-cvs-temp/includes/database.mysqli.inc drupal-6-cvs/includes/database.mysqli.inc
--- drupal-6-cvs-temp/includes/database.mysqli.inc	2009-12-09 14:30:01.000000000 -0500
+++ drupal-6-cvs/includes/database.mysqli.inc	2009-12-09 14:32:53.000000000 -0500
@@ -363,6 +363,7 @@
  * @return SQL query with the DISTINCT wrapper surrounding the given table.field.
  */
 function db_distinct_field($table, $field, $query) {
+  var_dump($table, $field, $query);
   $field_to_select = 'DISTINCT('. $table .'.'. $field .')';
   $matches = array();
   if (preg_match('/^SELECT(.*?)FROM(.*)/is', $query, $matches)) {
@@ -373,6 +374,7 @@
     
     return 'SELECT' . $select . 'FROM'.$matches[2];
   }
+  var_dump($query);
   return $query;
 }
 
diff -u -r drupal-6-cvs-temp/includes/database.mysql.inc drupal-6-cvs/includes/database.mysql.inc
--- drupal-6-cvs-temp/includes/database.mysql.inc	2009-12-09 14:30:01.000000000 -0500
+++ drupal-6-cvs/includes/database.mysql.inc	2009-12-09 14:31:47.000000000 -0500
@@ -361,6 +361,7 @@
  * @return SQL query with the DISTINCT wrapper surrounding the given table.field.
  */
 function db_distinct_field($table, $field, $query) {
+  var_dump($table, $field, $query);
   $field_to_select = 'DISTINCT('. $table .'.'. $field .')';
   $matches = array();
   if (preg_match('/^SELECT(.*?)FROM(.*)/is', $query, $matches)) {
@@ -371,6 +372,7 @@
     
     return 'SELECT'. $select .'FROM'. $matches[2];
   }
+  var_dump($query);
   return $query;
 }