Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/4379#discussion_r128657888
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/AggregateFunction.scala
---
@@ -136,8 +137,26 @@ abstract class AggregateFunction[T, ACC] extends
UserDefinedFunction {
*/
def getValue(accumulator: ACC): T
- /**
- * whether this aggregate only used in OVER clause
+ /**
+ * Returns true if this AggregateFunction can only be applied in an
OVER window.
+ *
+ * @return true if the AggregateFunction requires an OVER window, false
otherwise.
*/
def requiresOver: Boolean = false
+
+ /**
+ * Returns the TypeInformation for the result of the AggregateFunction.
--- End diff --
`TypeInformation for the result ` -> `TypeInformation of the result `
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