juntaozhang commented on code in PR #4353:
URL: https://github.com/apache/calcite/pull/4353#discussion_r2070305001


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core/src/main/java/org/apache/calcite/sql/SqlOperator.java:
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@@ -114,10 +114,10 @@ public abstract class SqlOperator {
   private final int rightPrec;
 
   /** Used to infer the return type of a call to this operator. */
-  private final @Nullable SqlReturnTypeInference returnTypeInference;
+  protected final @Nullable SqlReturnTypeInference returnTypeInference;

Review Comment:
   Got it, thanks for your reminding.



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