Method _lower

dask/dataframe/dask_expr/_expr.py:922–938

(self)

        return calc_divisions_for_align(*args, allow_shuffle=False)

    def _lower(self):
        args = [self.frame] + self.operands[len(self._parameters) :]
        args = maybe_align_partitions(*args, divisions=self._divisions())
        return MapOverlap(
            args[0],
            self.func,
            self.before,
            self.after,
            self._meta,
            self.enforce_metadata,
            self.transform_divisions,
            self.clear_divisions,
            self.align_dataframes,
            self.token,
            self.kwargs,
            *args[1:],
        )


class MapOverlap(MapPartitions):