Method _meta

dask/dataframe/dask_expr/_expr.py:906–919

(self)

    @functools.cached_property
    def _meta(self):
        meta = self.operand("meta")
        args = [self.frame._meta] + [
            arg._meta if isinstance(arg, Expr) else arg
            for arg in self.operands[len(self._parameters) :]
        ]
        return _get_meta_map_partitions(
            args,
            [self.dependencies()[0]],
            self.func,
            self.kwargs,
            meta,
            self.kwargs.pop("parent_meta", None),
        )

    def _divisions(self):
        args = [self.frame] + self.operands[len(self._parameters) :]