return Features(recursive_reorder(self, other))

    def flatten(self, max_depth=16) -> "Features":
        """Flatten the features. Every dictionary column is removed and is replaced by
        all the subfields it contains. The new fields are named by concatenating the
        name of the original column and the subfield name like this: `<original>.<subfield>`.

        If a column contains nested dictionaries, then all the lower-level subfields names are
        also concatenated to form new columns: `<original>.<subfield>.<subsubfield>`, etc.

        Returns:
            [`Features`]:
                The flattened features.

        Example: