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  1. Beam
  2. BEAM-12444

GroupBy.apply on a series grouped by a callable fails

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      df.foo.groupby(lambda x: x % 3).apply(...)
      

      This example fails because it tries to call set_index on a Series. It fails at construction time, not at execution time.

      To workaround users can call groupby on a single column dataframe instead, e.g. df[['foo']].groupby...

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              bhulette Brian Hulette
              bhulette Brian Hulette
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