Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3743#discussion_r112650081
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/java/windows.scala
---
@@ -82,3 +84,32 @@ object Session {
*/
def withGap(gap: String): SessionWindow = new SessionWindow(gap)
}
+
+/**
+ * Helper object for creating a over window.
+ */
+object Over {
+
+ /**
+ * Specifies the time attribute on which rows are grouped.
+ *
+ * For streaming tables call [[orderBy 'rowtime or orderBy 'proctime]]
to specify time mode.
+ *
+ * For batch tables, refer to a timestamp or long attribute.
+ */
+ def orderBy(orderBy: Expression): OverWindowPredefined = {
--- End diff --
The Java API is based on `String` not `Expression`
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