jnh5y commented on code in PR #23735:
URL: https://github.com/apache/flink/pull/23735#discussion_r1395740589


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificInputTypeStrategies.java:
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@@ -65,6 +65,11 @@ public static InputTypeStrategy 
windowTimeIndicator(TimestampKind timestampKind)
         return new WindowTimeIndictorInputTypeStrategy(timestampKind);
     }
 
+    /** See {@link WindowTimeIndictorInputTypeStrategy}. */
+    public static InputTypeStrategy windowTimeIndicator() {
+        return new WindowTimeIndictorInputTypeStrategy(null);

Review Comment:
   Is there a good example of when this is null?
   
   Is this already tested?



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