Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19929#discussion_r158595341
--- Diff: python/pyspark/sql/functions.py ---
@@ -2075,9 +2075,10 @@ class PandasUDFType(object):
def udf(f=None, returnType=StringType()):
--- End diff --
I am saying this because I had few talks about this before and I am pretty
sure we usually keep them as same whenever possible.
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