Refactoring based on comments

src/parser/mod.rs

@@ -1270,12 +1270,14 @@ impl<'a> Parser<'a> {
             }
             // Handle parenthesized wildcard: (*)
             Token::LParen => {
-                let inner_token = self.next_token();
-                if inner_token.token == Token::Mul && self.peek_token().token == Token::RParen {
+                let [maybe_mul, maybe_rparen] = self.peek_tokens_ref();
+                if maybe_mul.token == Token::Mul && maybe_rparen.token == Token::RParen {
+                    let mul_token = self.next_token(); // consume Mul
                     self.next_token(); // consume RParen
-                    return Ok(Expr::Wildcard(AttachedToken(inner_token)));
+                    return Ok(Expr::Wildcard(AttachedToken(mul_token)));
                 }
-                // Not a (*), reset and fall through to parse_expr
+                // Not a (*), fall through to reset index and call parse_expr
+                self.prev_token();
             }
             _ => (),
         };

tests/sqlparser_common.rs

@@ -17955,7 +17955,7 @@ fn test_parse_set_session_authorization() {
 }
 
 #[test]
-fn parse_select_distinct_parenthesized_wildcard() {
+fn parse_select_parenthesized_wildcard() {
     // Test SELECT DISTINCT(*) which uses a parenthesized wildcard
     // The parentheses are syntactic sugar and get normalized to just *
     let sql = "SELECT DISTINCT (*) FROM table1";