Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22319#discussion_r214581734
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala
---
@@ -129,3 +135,11 @@ case class UserDefinedFunction protected[sql] (
}
}
}
+
+object UserDefinedFunction {
--- End diff --
`private[sql]` since we don't explicitly mention `expressions` package is
meant to be internal.
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