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https://issues.apache.org/jira/browse/BEAM-12495?focusedWorklogId=611613&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-611613
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ASF GitHub Bot logged work on BEAM-12495:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 15/Jun/21 21:35
            Start Date: 15/Jun/21 21:35
    Worklog Time Spent: 10m 
      Work Description: codecov[bot] edited a comment on pull request #15019:
URL: https://github.com/apache/beam/pull/15019#issuecomment-861824969


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   ```diff
   @@            Coverage Diff             @@
   ##           master   #15019      +/-   ##
   ==========================================
   + Coverage   83.74%   83.76%   +0.02%     
   ==========================================
     Files         439      439              
     Lines       59041    59043       +2     
   ==========================================
   + Hits        49442    49457      +15     
   + Misses       9599     9586      -13     
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 611613)
    Time Spent: 50m  (was: 40m)

> DataFrame API: groupby(dropna=False) still drops NAs when grouping on 
> multiple columns or indexes
> -------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-12495
>                 URL: https://issues.apache.org/jira/browse/BEAM-12495
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Brian Hulette
>            Priority: P2
>              Labels: dataframe-api
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> {code}
> df.groupby(['foo', 'bar'], dropna=False).sum()
> {code}
> This will still drop NAs in the output.
> This is due to pandas bug 
> [36470|https://github.com/pandas-dev/pandas/issues/36470] "BUG: groupby(..., 
> dropna=False) excludes NA values when grouping on MultiIndex levels".
> We implement groupby by moving all grouped data into the index and requiring 
> Index() partitioning, so we will always run into this issue, even when the 
> user is grouping on columns, not indexes.



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