Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3743#discussion_r112570230
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamOverAggregate.scala
---
@@ -93,28 +96,43 @@ class DataStreamOverAggregate(
val orderKeys = overWindow.orderKeys.getFieldCollations
- if (orderKeys.size() != 1) {
- throw new TableException(
- "Unsupported use of OVER windows. The window can only be ordered
by a single time column.")
- }
- val orderKey = orderKeys.get(0)
+ val timeType = if (!orderKeys.isEmpty) {
+ if (orderKeys.size() != 1) {
+ throw new TableException(
+ "Unsupported use of OVER windows. The window can only be ordered
by a single time " +
+ "column.")
+ }
+ val orderKey = orderKeys.get(0)
- if (!orderKey.direction.equals(ASCENDING)) {
- throw new TableException(
- "Unsupported use of OVER windows. The window can only be ordered
in ASCENDING mode.")
+ if (!orderKey.direction.equals(ASCENDING)) {
+ throw new TableException(
+ "Unsupported use of OVER windows. The window can only be ordered
in ASCENDING mode.")
+ }
+ inputType
+ .getFieldList
+ .get(orderKey.getFieldIndex)
+ .getValue.asInstanceOf[TimeModeType]
+ } else {
--- End diff --
this could be removed if we don't use literals for the orderBy() field
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