Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/16533#discussion_r97911757
--- Diff: python/pyspark/sql/functions.py ---
@@ -1862,9 +1862,33 @@ def udf(f, returnType=StringType()):
>>> slen = udf(lambda s: len(s), IntegerType())
>>> df.select(slen(df.name).alias('slen')).collect()
[Row(slen=5), Row(slen=3)]
+ >>> @udf
+ ... def to_upper(s):
+ ... if s is not None:
+ ... return s.upper()
+ ...
+ >>> @udf(returnType=IntegerType())
+ ... def add_one(x):
+ ... if x is not None:
+ ... return x + 1
+ ...
"""
return UserDefinedFunction(f, returnType)
+
[email protected](_udf)
+def udf(f=None, returnType=StringType()):
+ """A decorator version of pyspark.sql.functions.udf
+ """
+ if f is None or isinstance(f, DataType):
--- End diff --
Maybe you can mention why this would be the case in the comment as well?
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