snuyanzin commented on code in PR #20850:
URL: https://github.com/apache/flink/pull/20850#discussion_r972995310


##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/SubQueryDecorrelator.java:
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@@ -451,7 +452,7 @@ public Frame decorrelateRel(LogicalProject rel) {
 
             // Project projects the original expressions,
             // plus any correlated variables the input wants to pass along.
-            final List<Pair<RexNode, String>> projects = new ArrayList<>();
+            final List<Pair<RexNode, ? extends @Nullable String>> projects = 
new ArrayList<>();

Review Comment:
   Changed at https://issues.apache.org/jira/browse/CALCITE-4199



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