original_string: public function where($column, $expression = null, $value = null)
      {
          return $this->doWhere(self::AND_WHERE, $column, $expression, $value);
      }
code: public function where($column, $expression = null, $value = null)
      {
          return $this->doWhere(self::AND_WHERE, $column, $expression, $value);
      }
code_tokens: public function where ( $ column , $ expression = null , $ value = null ) { return $ this -> doWhere ( self :: AND_WHERE , $ column , $ expression , $ value ) ; }
docstring: Add a 'where' clause to the query.
  
  @param string $column     The column name
  @param string $expression The comparison, e.g. '=' or '<'
  @param string $value      The value
docstring_tokens: Add a where clause to the query .