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  1. Beam
  2. BEAM-11931

str.split(expand=True) doesn't correctly produce None

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      series.str.split(expand=True) and rsplit(expand=True) usually produce None for missing values:

      >>> s.str.split(expand=True)
                                                     0     1     2        3         4
      0                                           this    is     a  regular  sentence
      1  https://docs.python.org/3/tutorial/index.html  None  None     None      None
      2                                            NaN   NaN   NaN      NaN       NaN 
      

      And NaNs are only produced for invalid inputs. Our implementation populates missing values with NaN, because they're added in the final pd.concat.

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            Unassigned Unassigned
            bhulette Brian Hulette
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