ueshin commented on a change in pull request #33714:
URL: https://github.com/apache/spark/pull/33714#discussion_r691704339
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File path: python/pyspark/pandas/tests/test_dataframe.py
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@@ -5614,6 +5614,40 @@ def test_at_time(self):
with self.assertRaisesRegex(TypeError, "Index must be DatetimeIndex"):
psdf.at_time("0:15")
+ def test_combine_first(self):
Review comment:
`Series.combine_first` might be a good reference?
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