xiedeyantu commented on code in PR #4501:
URL: https://github.com/apache/calcite/pull/4501#discussion_r2300887870


##########
core/src/main/java/org/apache/calcite/sql/type/FunctionSqlType.java:
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@@ -25,16 +25,26 @@
 
 /**
  * Function type.
- * The type of lambda expression can be represented by a function type.
+ *
+ * <p>The type of lambda expression can be represented by a function type.
  */
 public class FunctionSqlType extends AbstractSqlType {
   private final RelDataType parameterType;
   private final RelDataType returnType;
 
+  /**

Review Comment:
   I guess he meant that if it must be a Struct, that is, it supports multiple 
parameters, this point needs to be clarified. We can also wait for mihai's 
reply.



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