xinrong-databricks commented on a change in pull request #33735:
URL: https://github.com/apache/spark/pull/33735#discussion_r688775535
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File path: python/pyspark/pandas/data_type_ops/datetime_ops.py
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@@ -135,9 +136,7 @@ def astype(self, index_ops: IndexOpsLike, dtype: Union[str,
type, Dtype]) -> Ind
elif isinstance(spark_type, StringType):
if isinstance(dtype, extension_dtypes):
# seems like a pandas' bug?
- scol = F.when(index_ops.spark.column.isNull(),
str(pd.NaT)).otherwise(
- index_ops.spark.column.cast(spark_type)
- )
+ return _as_string_type(index_ops, dtype)
Review comment:
It would be nice to say that `null_str` is for non-extension dtypes only
in the docstring of `_as_string_type`. I may also file a follow-up PR if needed.
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