BUG: fix subclass metadata preservation in groupby column selection #56761
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jorisvandenbossche
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… in groupby column selection
phofl
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…vation in groupby column selection) (#56770) Backport PR #56761: BUG: fix subclass metadata preservation in groupby column selection Co-authored-by: Joris Van den Bossche <[email protected]>
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This is a small regression that was introduced with #51090 (in pandas 2.0): before that PR, the column subselection in the groupby code was done with a standard
__getitem__call, while the PR introduced an optimized helper_getitem_nocopyto avoid the copy that a standard__getitem__does. However, that new helper forgot to add a__finalize__call after_constructorfrom a manager.The reason we noticed this in geopandas (geopandas/geopandas#3130) was to update our tests for the
applydeprecation to include group columns (for which one alternative is to specifically select the non-group columns, but so that didn't work with recent pandas versions)