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MDEV-27434 DESC attribute does not work with auto-increment on secondary column of multi-part index

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when searching for the last auto-inc value, it's HA_READ_PREFIX_LAST for
the ASC keypart, but HA_READ_PREFIX for the DESC one

also fixes MDEV-27585
This commit is contained in:
Sergei Golubchik
2022-01-08 15:08:21 +01:00
parent 9b6d2ad745
commit 72b5b8b2e3
6 changed files with 88 additions and 12 deletions
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19
mysql-test/main/myisam.test
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@ -8,9 +8,6 @@ call mtr.add_suppression("Can't find record in '.*'");
call mtr.add_suppression("Table 't1' is marked as crashed and should be repaired");
# Initialise
--disable_warnings
drop table if exists t1,t2,t3;
--enable_warnings
SET SQL_WARNINGS=1;
#
@ -1882,6 +1879,22 @@ select distinct c from t;
select c from t;
drop table t;
--echo #
--echo # MDEV-27434 DESC attribute does not work with auto-increment on secondary column of multi-part index
--echo #
create table t (a int auto_increment, b int, unique(b,a desc)) engine=myisam;
insert ignore into t (b) values (10),(10),(10);
select * from t;
drop table t;
--echo #
--echo # MDEV-27585 Auto-increment on secondary column increments unexpectedly with DESC key
--echo #
create table t (c char(16), i int auto_increment, index (c,i desc)) engine=myisam collate latin1_swedish_ci;
insert into t (c) values ('ä'),('a');
select hex(c),c,i from t order by c, i;
drop table t;
--echo #
--echo # End of 10.8 tests
--echo #