itholic commented on a change in pull request #33735: URL: https://github.com/apache/spark/pull/33735#discussion_r689990823
########## File path: python/pyspark/pandas/data_type_ops/datetime_ops.py ########## @@ -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. I added ! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org