Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20137#discussion_r159506888
--- Diff: python/pyspark/sql/catalog.py ---
@@ -255,9 +255,26 @@ def registerFunction(self, name, f,
returnType=StringType()):
>>> _ = spark.udf.register("stringLengthInt", len, IntegerType())
>>> spark.sql("SELECT stringLengthInt('test')").collect()
[Row(stringLengthInt(test)=4)]
--- End diff --
Let's fix the doc for this too. It says `:param f: python function` but we
could describe that it takes Python native function, wrapped function and
`UserDefinedFunction` too.
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