--- database.pgsql.inc.20061227	2006-12-27 17:13:56.000000000 -0500
+++ database.pgsql.inc	2007-02-26 00:42:27.000000000 -0500
@@ -418,7 +418,7 @@ function db_check_setup() {
  * @return SQL query with the DISTINCT wrapper surrounding the given table.field.
  */
 function db_distinct_field($table, $field, $query) {
-  $field_to_select = 'DISTINCT ON ('. $table .'.'. $field .") $table.$field";
+  $field_to_select = 'DISTINCT('. $table .'.'. $field .")";
   // (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
   $query = preg_replace('/(SELECT.*)(?:'. $table .'\.|\s)(?<!DISTINCT\()(?<!DISTINCT\('. $table .'\.)'. $field .'(.*FROM )/AUsi', '\1 '. $field_to_select .'\2', $query);
   $query = preg_replace('/(ORDER BY )(?!'.$table.'\.'.$field.')/', '\1'."$table.$field, ", $query);