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BUG: DataFrameGroupby.transform("size") fails #45716

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Merged
merged 2 commits into from
Jan 30, 2022

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rhshadrach
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axis=1 produces incorrect results for both aggregations and transforms. Opened #45715 and will be tackling separately.

@rhshadrach rhshadrach added Bug Groupby Apply Apply, Aggregate, Transform, Map labels Jan 30, 2022
@jreback jreback added this to the 1.5 milestone Jan 30, 2022
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jreback commented Jan 30, 2022

is this a regression in 1.4.x? or just not tested previously

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@jreback

is this a regression in 1.4.x? or just not tested previously

Not sure if it's a regression - if it is it's from before July 2019.

@jreback jreback merged commit 72c87f4 into pandas-dev:main Jan 30, 2022
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jreback commented Jan 30, 2022

thanks @rhshadrach

@rhshadrach rhshadrach deleted the transform_size branch January 31, 2022 01:06
phofl pushed a commit to phofl/pandas that referenced this pull request Feb 14, 2022
yehoshuadimarsky pushed a commit to yehoshuadimarsky/pandas that referenced this pull request Jul 13, 2022
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BUG: Groupby.transform('size') fails for multicolumn frame
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