Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18659#discussion_r138272979
--- Diff: python/pyspark/serializers.py ---
@@ -81,6 +81,12 @@ class SpecialLengths(object):
NULL = -5
+class PythonEvalType(object):
+ NON_UDF = 0
+ SQL_BATCHED_UDF = 1
+ SQL_ARROW_UDF = 2
--- End diff --
ditto
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