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Fixed MDEV-5424: SELECT using ORDER BY DESC and LIMIT produces unexpected results (InnoDB/XtraDB)

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This only happend when using an ORDER BY on a primary key part, where all other key parts where constant.
Remove of duplicated expressions in ORDER BY (as the old code did this in some strange cases)


mysql-test/r/group_by.result:
  Fixed results to take into account that duplicate order by parts are now deleted
mysql-test/r/group_by_innodb.result:
  Ensure extended keys are on
mysql-test/r/innodb_ext_key.result:
  More tests
mysql-test/r/order_by.result:
  More tests
mysql-test/t/group_by.test:
  Fixed results to take into account that duplicate order by parts are now deleted
mysql-test/t/group_by_innodb.test:
  Ensure extended keys are on
mysql-test/t/innodb_ext_key.test:
  More tests
mysql-test/t/order_by.test:
  More tests
sql/sql_select.cc:
  Fixed bug where we looked at extended key parts when we shouldn't
  Remove of duplicated expressions in ORDER BY
sql/table.cc:
  Indentation fixes
This commit is contained in:
Michael Widenius
2014-01-02 15:51:02 +02:00
parent f8c7e3477f
commit c050b5fdf9
10 changed files with 149 additions and 37 deletions
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28
mysql-test/t/innodb_ext_key.test
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@@ -662,6 +662,34 @@ ORDER BY rev_timestamp ASC LIMIT 10;
DROP TABLE t1,t2,t3;
--echo #
--echo # MDEV-5424 SELECT using ORDER BY DESC and LIMIT produces unexpected
--echo # results (InnoDB/XtraDB)
--echo #
create table t1 (a bigint not null unique auto_increment, b varchar(10), primary key (a), key (b(2))) engine = myisam default character set utf8;
create table t2 (a bigint not null unique auto_increment, b varchar(10), primary key (a), key (b(2))) engine = innodb default character set utf8;
insert into t1 (b) values (null), (null), (null);
insert into t2 (b) values (null), (null), (null);
set optimizer_switch='extended_keys=on';
explain select a from t1 where b is null order by a desc limit 2;
select a from t1 where b is null order by a desc limit 2;
explain select a from t2 where b is null order by a desc limit 2;
select a from t2 where b is null order by a desc limit 2;
set optimizer_switch='extended_keys=off';
explain select a from t2 where b is null order by a desc limit 2;
select a from t2 where b is null order by a desc limit 2;
explain select a from t2 where b is null order by a desc;
select a from t2 where b is null order by a desc;
explain select a from t2 where b is null order by a desc,a,a;
select a from t2 where b is null order by a desc,a,a;
drop table t1, t2;
set optimizer_switch=@save_optimizer_switch;
set optimizer_switch=@save_ext_key_optimizer_switch;