xiedeyantu commented on code in PR #4501:
URL: https://github.com/apache/calcite/pull/4501#discussion_r2300868739


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core/src/main/java/org/apache/calcite/sql/type/FunctionSqlType.java:
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@@ -58,6 +58,10 @@ public FunctionSqlType(
     return this;
   }
 
+  public RelDataType getParameterType() {

Review Comment:
   To be honest, I don't really understand this. I just saw your modification 
and didn't quite understand it. That's why I asked the question above. I saw 
your reply saying that RexProgramBuilder:77 will check whether it is a Struct. 
What happens if the type is not a Struct?



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