- use sql standard concat syntax instead of registering concat() mysql hack

lib/Doctrine/Connection/Sqlite.php

@@ -71,7 +71,6 @@ class Doctrine_Connection_Sqlite extends Doctrine_Connection_Common
 
         if ($this->isConnected) {
             $this->dbh->sqliteCreateFunction('mod',    array('Doctrine_Expression_Sqlite', 'modImpl'), 2);
-            $this->dbh->sqliteCreateFunction('concat', array('Doctrine_Expression_Sqlite', 'concatImpl'));
             $this->dbh->sqliteCreateFunction('md5', 'md5', 1);
             $this->dbh->sqliteCreateFunction('now', 'time', 0);
         }
@@ -92,7 +91,6 @@ class Doctrine_Connection_Sqlite extends Doctrine_Connection_Common
         parent::connect();
 
         $this->dbh->sqliteCreateFunction('mod',    array('Doctrine_Expression_Sqlite', 'modImpl'), 2);
-        $this->dbh->sqliteCreateFunction('concat', array('Doctrine_Expression_Sqlite', 'concatImpl'));
         $this->dbh->sqliteCreateFunction('md5', 'md5', 1);
         $this->dbh->sqliteCreateFunction('now', 'time', 0);
     }

lib/Doctrine/Expression/Sqlite.php

@@ -55,17 +55,6 @@ class Doctrine_Expression_Sqlite extends Doctrine_Expression_Driver
         return $dividend % $divisor;
     }
 
-    /**
-     * Returns a concatenation of the data that SQLite's concat() function receives.
-     *
-     * @return string
-     */
-    public static function concatImpl()
-    {
-        $args = func_get_args();
-        return join('', $args);
-    }
-
     /**
      * locate
      * returns the position of the first occurrence of substring $substr in string $str that