shunping commented on code in PR #39056:
URL: https://github.com/apache/beam/pull/39056#discussion_r3454651466
##########
sdks/python/apache_beam/dataframe/frames.py:
##########
@@ -5050,11 +5050,19 @@ def get_dummies(self, **kwargs):
cat.split(sep=kwargs.get('sep', '|')) for cat in dtype.categories
]
+ # Find the name pandas uses for the NaN column in get_dummies().
+ # Older pandas versions (<2.3.0) use 'nan', whereas newer versions
+ # use 'NaN'. We dynamically detect it by running a minimal local operation.
+ dummy_nan_col = pd.Series(
+ ['a', None], dtype='category').str.get_dummies().columns.difference(
+ ['a'])[0]
Review Comment:
Fixed.
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