database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

MDEV-29069 follow-up: improve DEFAULT rules

Browse Source 
previously, fields with DEFAULTs were allowed just when expression is
deterministic. In case of online alter, we should recursively check that
underlying fields of expression also either have explicit values, or
have DEFAULT following this validity rule.
This commit is contained in:
Nikita Malyavin
2022-11-29 20:40:07 +01:00
committed by Sergei Golubchik
parent 30756775d5
commit 41697008fe
4 changed files with 127 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
mysql-test/main/alter_table_online_debug.test
View File

@ -1284,6 +1284,42 @@ set debug_sync= 'now signal goforit';
--reap
--echo #
--echo # Useful UNIQUE, though a virtual column on another extra field
--echo #
create or replace table t (a int primary key, b int default (a+1));
insert into t values (10, 10),(20, 20),(30, 30);
set debug_sync= 'alter_table_online_downgraded signal downgraded wait_for goforit';
--send
alter table t drop primary key, add c int default(a),
add d int as (c) stored unique, algorithm=copy, lock=none;
--connection con2
set debug_sync= 'now wait_for downgraded';
delete from t where a = 20;
update t set a = a + 2 where a = 10;
set debug_sync= 'now signal goforit';
--connection default
--reap
select * from t;
--echo #
--echo # Now this index is not usable (missing DEFAULT on field c)
--echo #
create or replace table t (a int primary key, b int);
insert into t values (10, 10),(20, 20),(30, 30);
set debug_sync= 'alter_table_online_downgraded signal downgraded wait_for goforit';
--send
alter table t drop primary key, add c real default(rand(a)),
add d real as (c) stored unique, algorithm=copy, lock=none;
--connection con2
set debug_sync= 'now wait_for downgraded';
delete from t where a = 20;
update t set a = a + 2 where a = 10;
set debug_sync= 'now signal goforit';
--connection default
--reap
select a, b from t;
# Cleanup
drop table t;
set debug_sync= reset;