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MDEV-26938 Support descending indexes internally in InnoDB (server part)

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* preserve DESC index property in the parser
* store it in the frm (only for HA_KEY_ALG_BTREE)
* read it from the frm
* show it in SHOW CREATE
* skip DESC indexes in opt_range.cc and opt_sum.cc
* ORDER BY test

This includes a fix of MDEV-27432.
This commit is contained in:
Sergei Golubchik
2021-11-24 16:50:21 +01:00
parent 358921ce32
commit a4cac0e07a
28 changed files with 882 additions and 119 deletions
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14
mysql-test/main/partition_order.test
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@ -1,14 +1,9 @@
#--disable_abort_on_error
#
# Simple test for the partition storage engine
# Focuses on tests of ordered index read
#
-- source include/have_partition.inc
--disable_warnings
drop table if exists t1;
--enable_warnings
#
# Ordered index read, int type
#
@ -842,3 +837,12 @@ INSERT into t1 values (1, NULL, NULL), (2, NULL, '10');
select * from t1 where a = 1 order by a desc, b desc;
select * from t1 where a = 1 order by b desc;
drop table t1;
--echo #
--echo # MDEV-13756 Implement descending index: KEY (a DESC, b ASC)
--echo #
create table t1 (a int, b int, key(a desc)) partition by hash(a) partitions 4;
insert into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6);
explain select * from t1 order by a limit 3;
select * from t1 order by a limit 3;
drop table t1;