Add a comment about RESERVED_FOR_TABLE_ALIAS to parse_table_and_joins

src/sqlparser.rs

@@ -1611,6 +1611,10 @@ impl Parser {
 
     pub fn parse_table_and_joins(&mut self) -> Result<TableWithJoins, ParserError> {
         let relation = self.parse_table_factor()?;
+
+        // Note that for keywords to be properly handled here, they need to be
+        // added to `RESERVED_FOR_TABLE_ALIAS`, otherwise they may be parsed as
+        // a table alias.
         let mut joins = vec![];
         loop {
             let join = if self.parse_keyword("CROSS") {