Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22732#discussion_r225764876
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala
---
@@ -81,11 +81,11 @@ case class UserDefinedFunction protected[sql] (
f,
dataType,
exprs.map(_.expr),
+ nullableTypes.map(_.map(!_)).getOrElse(exprs.map(_ => false)),
--- End diff --
Hm, but we can't use getParameterTypes anymore. It won't work in Scala
2.12. Where the nullability info is definitely not available, be conservative
and assume it all needs null handling?
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