Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3176#discussion_r101265531
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/UserDefinedFunction.scala
---
@@ -24,4 +24,19 @@ package org.apache.flink.table.functions
* User-defined functions must have a default constructor and must be
instantiable during runtime.
*/
trait UserDefinedFunction {
--- End diff --
Did you run your code in Java 7 or Java 8? Java 8 introduces default
implementation for interfaces, but Java 7 could cause problems. I think it
won't hurt if we convert it into an `abstract class`.
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