Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3330#discussion_r102037328
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/ScalarFunction.scala
---
@@ -58,6 +60,11 @@ abstract class ScalarFunction extends
UserDefinedFunction {
override def toString: String = getClass.getCanonicalName
+ final def functionIdentifier: String = {
--- End diff --
The `UserDefinedFunction` has been declared as an abstract class in the
newest master when we adding `open` and `close` default implementation. I think
the `functionIdentifier` can be the same and will not hurt anything.
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