Fix new clippy errors (#412)

tests/sqlparser_common.rs

@@ -343,6 +343,15 @@ fn parse_select_distinct_two_fields() {
     );
 }
 
+#[test]
+fn parse_select_distinct_missing_paren() {
+    let result = parse_sql_statements("SELECT DISTINCT (name, id FROM customer");
+    assert_eq!(
+        ParserError::ParserError("Expected ), found: FROM".to_string()),
+        result.unwrap_err(),
+    );
+}
+
 #[test]
 fn parse_select_all() {
     one_statement_parses_to("SELECT ALL name FROM customer", "SELECT name FROM customer");