public function where($column, $operator, $value, $filter = false)
    {
        return $this->createConstraint(' WHERE', $column, $operator, $value, $filter);
    }
public function where($column, $operator, $value, $filter = false)
    {
        return $this->createConstraint(' WHERE', $column, $operator, $value, $filter);
    }
public function where ( $ column , $ operator , $ value , $ filter = false ) { return $ this -> createConstraint ( ' WHERE' , $ column , $ operator , $ value , $ filter ) ; }
Appends WHERE expression

@param string $column
@param string $operator
@param string $value
@param boolean $filter Whether to filter by value
@return \Krystal\Db\Sql\QueryBuilder
Appends WHERE expression