godfreyhe commented on code in PR #21225:
URL: https://github.com/apache/flink/pull/21225#discussion_r1019071678


##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/physical/stream/WatermarkAssignerChangelogNormalizeTransposeRule.java:
##########
@@ -359,6 +360,16 @@ private final RelNode buildTreeInOrder(
                                         inputNode,
                                         nodeAndTrait.f1.getTrait(
                                                 
FlinkRelDistributionTraitDef.INSTANCE()));
+            } else if (currentNode instanceof 
StreamPhysicalChangelogNormalize) {

Review Comment:
   This is hard to maintain now, I create an issue to do the refactor: 
https://issues.apache.org/jira/browse/FLINK-29981



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