Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21482#discussion_r192547364
--- Diff: python/pyspark/sql/functions.py ---
@@ -468,6 +468,18 @@ def input_file_name():
return Column(sc._jvm.functions.input_file_name())
+@since(2.4)
+def isinf(col):
+ """An expression that returns true iff the column is NaN.
--- End diff --
ditto. is this the same with `isnan`?
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