pralabhkumar commented on a change in pull request #35191:
URL: https://github.com/apache/spark/pull/35191#discussion_r819290416
##########
File path: python/pyspark/pandas/series.py
##########
@@ -5228,10 +5229,22 @@ def asof(self, where: Union[Any, List]) ->
Union[Scalar, "Series"]:
where = [where]
index_scol = self._internal.index_spark_columns[0]
index_type = self._internal.spark_type_for(index_scol)
+
+ if np.nan in where:
+ # When `where` is np.nan, pandas returns the last index value.
+ max_index =
self._internal.spark_frame.select(F.last(index_scol)).take(1)[0][0]
Review comment:
done the changes
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