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BUG: fix subclass metadata preservation in groupby column selection #56761
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phofl
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jorisvandenbossche:groupby-gotitem-nocopy-finalize
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Merged
BUG: fix subclass metadata preservation in groupby column selection #56761
phofl
merged 2 commits into
pandas-dev:main
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jorisvandenbossche:groupby-gotitem-nocopy-finalize
Jan 7, 2024
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rhshadrach
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lgtm
phofl
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… in groupby column selection
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Labels
Bug
Groupby
Regression
Functionality that used to work in a prior pandas version
Subclassing
Subclassing pandas objects
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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_nocopy
to avoid the copy that a standard__getitem__
does. However, that new helper forgot to add a__finalize__
call after_constructor
from a manager.The reason we noticed this in geopandas (geopandas/geopandas#3130) was to update our tests for the
apply
deprecation 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)