bvarghese1 commented on code in PR #26407:
URL: https://github.com/apache/flink/pull/26407#discussion_r2035654644


##########
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/plan/optimize/program/FlinkChangelogModeInferenceProgram.scala:
##########
@@ -310,18 +310,26 @@ class FlinkChangelogModeInferenceProgram extends 
FlinkOptimizeProgram[StreamOpti
           .newBuilder()
           .addContainedKind(ModifyKind.INSERT)
 
-        // All aggregates are computed over the same window and order by is 
supported for only 1 field
-        val orderKeyIndex =
-          
over.logicWindow.groups.get(0).orderKeys.getFieldCollations.get(0).getFieldIndex
-        val orderKeyType = 
over.logicWindow.getRowType.getFieldList.get(orderKeyIndex).getType
         if (
-          !FlinkTypeFactory.isRowtimeIndicatorType(orderKeyType)
-          && !FlinkTypeFactory.isProctimeIndicatorType(orderKeyType)
+          !over.logicWindow.groups.isEmpty && !over.logicWindow.groups
+            .get(0)
+            .orderKeys
+            .getFieldCollations
+            .isEmpty

Review Comment:
   Ideally this one condition should be enough i.e. 
`!groups.get(0).orderKeys.getFieldCollations.isEmpty` but the condition 
`!groups.isEmpty` is just a safety check. We can remove the safety check since 
there will always be 1 group.



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