Method _meta

dask/dataframe/dask_expr/_expr.py:1482–1487

(self)

    @functools.cached_property
    def _meta(self):
        return make_meta(
            meta_nonempty(self.frame._meta).isin(
                meta_nonempty(self.frame._meta).iloc[[0]]
            )
        )

    def _broadcast_dep(self, dep: Expr):
        return dep.npartitions == 1