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@MarcoGorelli MarcoGorelli commented Feb 22, 2020

just reopening #31973 for now - this doesn't special-case NaT. Will think if there's a better way to do it, feel free to close / take over if it's wrong

@MarcoGorelli MarcoGorelli changed the title Issue 31950 BUG: groupby nunique changing values Feb 22, 2020
@jreback jreback added this to the 1.0.2 milestone Feb 22, 2020
@jreback jreback added Groupby Regression Functionality that used to work in a prior pandas version labels Feb 22, 2020
@jreback jreback merged commit 7017599 into pandas-dev:master Feb 23, 2020
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jreback commented Feb 23, 2020

thanks @MarcoGorelli

meeseeksmachine pushed a commit to meeseeksmachine/pandas that referenced this pull request Feb 23, 2020
jreback pushed a commit that referenced this pull request Feb 23, 2020
Co-authored-by: Marco Gorelli <33491632+MarcoGorelli@users.noreply.github.com>
@MarcoGorelli MarcoGorelli deleted the issue-31950 branch February 25, 2020 17:10
roberthdevries pushed a commit to roberthdevries/pandas that referenced this pull request Mar 2, 2020
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BUG: groupby-nunique modifies null values

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