gaoqiangz commented on PR #1507:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1507#issuecomment-2466596855

   I modified existing `Function` parsing,including a break change,because 
`JSON_OBJECT` support `FUNC(<expr> : <expr>)` syntax:
   
   ```sql
   DECLARE @id_key nvarchar(10) = N'id',@id_value nvarchar(64) = NEWID();
   SELECT JSON_OBJECT(LOWER('USER_NAME') : USER_NAME(), LOWER(@id_key) : 
@id_value, 'sid':(SELECT @@SPID));
   ```
   
   Break change:
   
   ```rs
   pub enum FunctionArg {
       Named {
           name: Expr, // <<
           arg: FunctionArgExpr,
           operator: FunctionArgOperator,
       },
       Unnamed(FunctionArgExpr),
   }
   ```
   
   Please take a look!


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