Related to #28333 and #26513 There are several helper methods to help with named aggregations, that are found in [`pandas.core.groupby.generic`](https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py), namely: - [`_is_multi_agg_with_relabel`](https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py#L1704) - [`_normalize_keyword_aggregation`](https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py#L1729) - [`_make_unique`](https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py#L1793) If this functionality gets standardized across aggregations other than just `groupby`, it would make sense to have these moved out of this file.