gaoqiangz commented on code in PR #1507:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1507#discussion_r1835719464


##########
src/parser/mod.rs:
##########
@@ -11096,6 +11096,19 @@ impl<'a> Parser<'a> {
                 arg,
                 operator: FunctionArgOperator::Assignment,
             })
+        } else if dialect_of!(self is MsSqlDialect) {
+            // FUNC(<expr> : <expr>)
+            let name = self.parse_wildcard_expr()?;
+            if self.consume_token(&Token::Colon) {
+                let arg = self.parse_expr()?.into();
+                Ok(FunctionArg::Named {
+                    name,
+                    arg,
+                    operator: FunctionArgOperator::Colon,
+                })

Review Comment:
   How about this?
   
   ```rs
   pub enum FunctionArg {
       Named {
           name: Ident,
           arg: FunctionArgExpr,
           operator: FunctionArgOperator,
       },
       ExprNamed {
           name: Expr, // <<
           arg: FunctionArgExpr,
           operator: FunctionArgOperator,
       },
       Unnamed(FunctionArgExpr),
   }
   
   pub trait Dialect {
     /// Some dialect supports 
`function(<arbitrary-expr>:<arbitrary-expr>,...)`,
     /// for this scenario, when returning `true` use the 
`FunctionArg::ExprNamed` variant in all cases to express named arguments,
     /// otherwise use the `FunctionArg::Named` variant (compatible reason).
     fn supports_function_arg_expr_named { false }
   }
   ```



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