snuyanzin commented on code in PR #29424:
URL: https://github.com/apache/flink/pull/29424#discussion_r4217678673


##########
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/window/tvf/slicing/SliceAssigners.java:
##########
@@ -629,6 +633,10 @@ public AbstractSlicedSliceAssigner(int sliceEndIndex, 
SliceAssigner innerAssigne
 
         @Override
         public long assignSliceEnd(RowData element, ClockService clock) {
+            if (element.isNullAt(sliceEndIndex)) {
+                throw new IllegalStateException(
+                        "Slice end of a sliced input row is null. This is a 
bug.");

Review Comment:
   this is a bug where?
   flink, jdk, data, something else?
   if I see it as a user how can this message help me?



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