NobiGo commented on code in PR #3956:
URL: https://github.com/apache/calcite/pull/3956#discussion_r1857545137


##########
core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java:
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@@ -1854,7 +1854,7 @@ public class SqlStdOperatorTable extends 
ReflectiveSqlOperatorTable {
   public static final SqlFunction PI =
       SqlBasicFunction.create("PI", ReturnTypes.DOUBLE, OperandTypes.NILADIC,
           SqlFunctionCategory.NUMERIC)
-          .withSyntax(SqlSyntax.FUNCTION_ID);
+          .withSyntax(SqlSyntax.FUNCTION_ID_CONSTANT);

Review Comment:
   Yes. The PI behavior is different from the User. The PI always needs to use 
PI(). Before this PR, Calcite treats PI and USER as a class of functions.



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