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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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9
mysql-test/main/key.test
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@ -1,6 +1,3 @@
--disable_warnings
drop table if exists t1,t2,t3;
--enable_warnings
--source include/have_sequence.inc
SET SQL_WARNINGS=1;
@ -603,3 +600,9 @@ EXPLAIN SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
drop table t1,t2;
--echo #
--echo # MDEV-13756 Implement descending index: KEY (a DESC, b ASC)
--echo #
create table t1 (a int, b int, key(a), key(a desc));
drop table t1;