ensure comments are properly preserved

Author: maxcountryman

src/parser.rs

@@ -1966,7 +1966,11 @@ impl Parser {
 
             // Check if the recently consumed '(' started a derived table, in which case we've
             // parsed the subquery, followed by the closing ')', and the alias of the derived
-            // table. In the example above this is case (3), or another nested join (2).
+            // table. In the example above this is case (3).
+            //
+            // A parsing error from `parse_derived_table_factor` indicates that the '(' we've
+            // recently consumed does not start a derived table (cases 1, 2, or 4). Ignore the
+            // error and back up to where we after the opening '('.
             if let Some(parsed) =
                 self.maybe_parse(|parser| parser.parse_derived_table_factor(NotLateral))
             {