public function testCharLength()
 {
     $res = DatabaseCompatibilityUtil::charLength('tempColumn');
     $this->assertEquals('char_length(tempColumn)', $res);
 }
 /**
  * @param string $columnName
  */
 protected static function resolvColumnNameSqlLengthFunction($columnName)
 {
     assert('is_string($columnName)');
     return DatabaseCompatibilityUtil::charLength($columnName);
 }