Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/20348#discussion_r162857800 --- Diff: python/pyspark/sql/udf.py --- @@ -213,6 +213,10 @@ def register(self, name, f, returnType=None): `returnType` can be optionally specified when `f` is a Python function but not when `f` is a user-defined function. Please see below. + To register a non-deterministic Python function, users need to first build --- End diff -- Shall we switch this paragraph with `` `returnType` can be optionally s ... ``? I intended to explain `returnType` with case 1. and case 2. together.
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