MDEV-20279 Increase Aria index length limit

Limit increased from 1000 to 2000.

Avoiding stack overflow by only storing keys and pages on the stack in
recursive functions if there is plenty of space on it.

Other things:
- Use less stack space for b-tree operations as we now only allocate as
  much space as needed instead of always allocating HA_MAX_KEY_LENGTH.
- Replaced most usage of my_safe_alloca() in Aria with the stack_alloc
  interface.
- Moved my_setstacksize() to mysys/my_pthread.c

1 files changed, 3 insertions, 3 deletions

diff --git a/mysql-test/suite/maria/maria.test b/mysql-test/suite/maria/maria.test
index d5b9d839699..920443d4338 100644
--- a/mysql-test/suite/maria/maria.test
+++ b/mysql-test/suite/maria/maria.test
@@ -373,12 +373,12 @@ drop table t1;
 #
 
 --error 1071
-CREATE TABLE t1 (a varchar(255), b varchar(255), c varchar(255), d varchar(255), e varchar(255), KEY t1 (a, b, c, d, e));
+CREATE TABLE t1 (a varchar(255), b varchar(255), c varchar(255), d varchar(255), e varchar(255), f varchar(255), g varchar(255), h varchar(255), i varchar(255), KEY t1 (a, b, c, d, e, f, g, h, i));
 --error 1070
 CREATE TABLE t1 (a varchar(1), b varchar(1), key (a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b));
-CREATE TABLE t1 (a varchar(255), b varchar(255), c varchar(255), d varchar(255), e varchar(255));
+CREATE TABLE t1 (a varchar(255), b varchar(255), c varchar(255), d varchar(255), e varchar(255), f varchar(255), g varchar(255), h varchar(255), i varchar(255));
 --error 1071
-ALTER TABLE t1 ADD INDEX t1 (a, b, c, d, e);
+ALTER TABLE t1 ADD INDEX t1 (a, b, c, d, e, f, g, h, i);
 DROP TABLE t1;
 
 #