Brian Hulette created BEAM-11931:
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Summary: str.split(expand=True) doesn't correctly produce None
Key: BEAM-11931
URL: https://issues.apache.org/jira/browse/BEAM-11931
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Brian Hulette
series.str.split(expand=True) and rsplit(expand=True) usually produce None for
missing values:
{code}
>>> 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
{code}
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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