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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