Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3993#discussion_r119520730
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
---
@@ -329,6 +330,21 @@ object UserDefinedFunctionUtils {
}
/**
+ * Returns the value (boolean) of AggregateFunction#requiresOver() that
indicates if this
+ * AggregateFunction can only be used for over window aggregate. If
method requiresOver is not
+ * provided, return false as default value.
+ */
+ def getRequiresOverConfig(aggregateFunction: AggregateFunction[_, _]):
Boolean = {
+ try {
+ val method: Method =
aggregateFunction.getClass.getMethod("requiresOver")
--- End diff --
Yes, I think we should check the return type of `requiresOver` as well , in
order to give an explicit exception.
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