// The order by clause (e.g., ORDER BY c1, c2 ASC, c3 DESC)
final public void orderByClause(Query query) throws ParseException, InvalidQueryException {
QuerySort sort = new QuerySort();
AbstractColumn column;
SortOrder order;
jj_consume_token(KW_ORDER);
jj_consume_token(KW_BY);
column = abstractColumnDescriptor();
order = sortOrder();
sort.addSort(column, order);