snuyanzin commented on code in PR #20850:
URL: https://github.com/apache/flink/pull/20850#discussion_r972984794


##########
flink-table/flink-table-planner/src/main/java/org/apache/calcite/rel/core/Filter.java:
##########
@@ -38,10 +38,13 @@
 import org.apache.calcite.rex.RexShuttle;
 import org.apache.calcite.rex.RexUtil;
 import org.apache.calcite.util.Litmus;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 import java.util.List;
 import java.util.Objects;
 
+import static java.util.Objects.requireNonNull;
+

Review Comment:
   Changes in this file are from calcite 1.27.0



##########
flink-table/flink-table-planner/src/main/java/org/apache/calcite/rel/core/Intersect.java:
##########
@@ -40,7 +40,7 @@
  */
 public abstract class Intersect extends SetOp {
     /** Creates an Intersect. */
-    public Intersect(
+    protected Intersect(

Review Comment:
   Changes in this file are from calcite 1.27.0



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