Пример #1
0
    def project_second(self, *fields):
        """
        Initiates a ProjectJoin transformation.

        Projects the second join input.
        If the second join input is a Tuple DataSet, fields can be selected by their index.
        If the second join input is not a Tuple DataSet, no parameters should be passed.

        :param fields: The indexes of the selected fields.
        :return: An incomplete JoinProjection.
        """
        if self._info[_Fields.DISCARD2]:#key-selector usedused
            self._info[_Fields.OTHER][_Fields.OPERATOR]._pair = False
            type = self._info[_Fields.OTHER][_Fields.TYPES]
            self._info[_Fields.OTHER][_Fields.TYPES] = concat(type[0], type[1])
            if len(fields) == 0:#adjust index
                return self.project_second(1)
            else:
                fields = tuple(map(lambda x: x+1, fields))
        self._info[_Fields.PROJECTIONS].append(("second", fields))
        return self
 def _collect_append(self, value):
     self._collector.collect(concat(self.get_key(value), value))
 def _run_append(self):
     collector = self._collector
     for value in self._iterator:
         collector.collect(concat(self.get_key(value), value))
     collector._close()