TheNeuralBit commented on pull request #13401:
URL: https://github.com/apache/beam/pull/13401#issuecomment-733183249
The flaky test case was this:
```
ser = pd.Series([390., 350., 30., 20.],
index=['Falcon', 'Falcon', 'Parrot', 'Parrot'], name="Max
Speed")
ser.groupby(ser > 100).mean()
```
The error occurred in the `set_index` expression with `input_partitioning =
Singleton()` in the df.align call:
https://github.com/apache/beam/blob/245374ad7278fb72e2807c73fe39b930f456788e/sdks/python/apache_beam/dataframe/frames.py#L147-L150
For now I think we should just disable grouping by a Series (5dcdc9c)
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