mariadb/mysql-test/suite/innodb/t/instant_alter_null.test
Marko Mäkelä 9bc874a594 MDEV-23497 Make ROW_FORMAT=COMPRESSED read-only by default
Let us introduce the parameter innodb_read_only_compressed
that is ON by default, making any ROW_FORMAT=COMPRESSED tables
read-only.

I developed the ROW_FORMAT=COMPRESSED format based on
Heikki Tuuri's rough design between 2005 and 2008. It might
have been a good idea back then, but no proper benchmarks were
ever run to validate the design or the implementation.

The format has been more or less obsolete for years.
It limits innodb_page_size to 16384 bytes (the default),
and instant ALTER TABLE is not supported.

This is the first step towards deprecating and removing
write support for ROW_FORMAT=COMPRESSED tables.
2020-11-11 11:15:11 +02:00

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--source include/have_innodb.inc
--disable_query_log
SET @save_innodb_read_only_compressed=@@GLOBAL.innodb_read_only_compressed;
SET GLOBAL innodb_read_only_compressed=OFF;
--enable_query_log
create table t (a int NOT NULL) engine=innodb row_format= compressed;
--error ER_ALTER_OPERATION_NOT_SUPPORTED
alter table t modify a int NULL, algorithm=instant;
--disable_query_log
SET GLOBAL innodb_read_only_compressed=@save_innodb_read_only_compressed;
--enable_query_log
drop table t;
create table t (a int NOT NULL) engine=innodb row_format= dynamic;
--error ER_ALTER_OPERATION_NOT_SUPPORTED
alter table t modify a int NULL, algorithm=instant;
drop table t;
create table t (a int NOT NULL) engine=innodb row_format= compact;
--error ER_ALTER_OPERATION_NOT_SUPPORTED
alter table t modify a int NULL, algorithm=instant;
drop table t;
create table t (
id int primary key,
a int NOT NULL default 0,
b int NOT NULL default 0,
c int NOT NULL default 0,
index idx (a,b,c)
) engine=innodb row_format=redundant;
--error ER_BAD_NULL_ERROR
insert into t (id, a) values (0, NULL);
--error ER_BAD_NULL_ERROR
insert into t (id, b) values (0, NULL);
--error ER_BAD_NULL_ERROR
insert into t (id, c) values (0, NULL);
insert into t values (1,1,1,1);
set @id = (select table_id from information_schema.innodb_sys_tables
where name = 'test/t');
--replace_column 1 TABLE_ID
select * from information_schema.innodb_sys_columns where table_id=@id;
alter table t modify a int NULL, algorithm=instant;
insert into t values (2, NULL, 2, 2);
alter table t modify b int NULL, algorithm=nocopy;
insert into t values (3, NULL, NULL, 3);
alter table t modify c int NULL, algorithm=inplace;
insert into t values (4, NULL, NULL, NULL);
--replace_column 1 TABLE_ID
select * from information_schema.innodb_sys_columns where table_id=@id;
select * from t;
check table t;
drop table t;