WencongLiu commented on code in PR #24398:
URL: https://github.com/apache/flink/pull/24398#discussion_r1510727272


##########
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java:
##########
@@ -1071,6 +1077,110 @@ protected SingleOutputStreamOperator<T> 
aggregate(AggregationFunction<T> aggrega
         return reduce(aggregate).name("Keyed Aggregation");
     }
 
+    @Override
+    public PartitionWindowedStream<T> fullWindowPartition() {
+        throw new UnsupportedOperationException(
+                "KeyedStream doesn't support processing non-keyed 
partitions.");

Review Comment:
   After offline discussion, we all agree that a better version is "KeyedStream 
doesn't support full window on partitions, if you want operations over 
each-key, use methods in KeyedStream directly." In DataStream V1, the 
KeyedStream doesn't have the concept "all records of same key is a partition".



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