Commit 8ef1afba authored by unknown's avatar unknown
Browse files

Better comment

parent ab77d7d7

sql/sql_select.cc

+3 −2
Original line number Diff line number Diff line
@@ -7179,8 +7179,9 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit, 
          /*

            We'll use ref access method on key new_ref_key. In general case 

            the index search tuple for new_ref_key will be different (e.g.

            when one of the indexes only covers prefix of the field, see

            BUG#9213 in group_by.test).

            when one index is defined as (part1, part2, ...) and another as

            (part1, part2(N), ...) and the WHERE clause contains 

            "part1 = const1 AND part2=const2". 

            So we build tab->ref from scratch here.

          */

          KEYUSE *keyuse= tab->keyuse;