JingsongLi commented on a change in pull request #17509:
URL: https://github.com/apache/flink/pull/17509#discussion_r746186312



##########
File path: 
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/rank/window/processors/RowTimeWindowRankProcessor.java
##########
@@ -81,7 +81,7 @@
     private transient JoinedRowData reuseOutput;
     private transient GenericRowData reuseRankRow;
 
-    public WindowRankProcessor(
+    public RowTimeWindowRankProcessor(

Review comment:
       Do we really need change class name? This will break compatibility.

##########
File path: 
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/window/slicing/SlicingWindowOperator.java
##########
@@ -116,6 +121,9 @@
     /** The tracked processing time triggered last time. */
     private transient long lastTriggeredProcessingTime;
 
+    /** The operator state to store watermark. */
+    private ListState<Long> watermarkState;

Review comment:
       transient




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