code: def where(self, column, operator=Null(), value=None, boolean="and"):
          
          if isinstance(column, Builder):
              self._query.add_nested_where_query(column.get_query(), boolean)
          else:
              self._query.where(column, operator, value, boolean)
  
          return self
docs: Add a where clause to the query
  
          :param column: The column of the where clause, can also be a QueryBuilder instance for sub where
          :type column: str|Builder
  
          :param operator: The operator of the where clause
          :type operator: str
  
          :param value: The value of the where clause
          :type value: mixed
  
          :param boolean: The boolean of the where clause
          :type boolean: str
  
          :return: The current Builder instance
          :rtype: Builder