MDEV-13134 Introduce ALTER TABLE attributes ALGORITHM=NOCOPY and ALGORITHM=INSTANT

Introduced new alter algorithm type called NOCOPY & INSTANT for
inplace alter operation.

NOCOPY - Algorithm refuses any alter operation that would
rebuild the clustered index. It is a subset of INPLACE algorithm.

INSTANT - Algorithm allow any alter operation that would
modify only meta data. It is a subset of NOCOPY algorithm.

Introduce new variable called alter_algorithm. The values are
DEFAULT(0), COPY(1), INPLACE(2), NOCOPY(3), INSTANT(4)

Message to deprecate old_alter_table variable and make it alias
for alter_algorithm variable.

alter_algorithm variable for slave is always set to default.

1 files changed, 1 insertions, 1 deletions

diff --git a/mysql-test/main/alter_table_online.result b/mysql-test/main/alter_table_online.result
index d5a2a028acc..2e3de2c0635 100644
--- a/mysql-test/main/alter_table_online.result
+++ b/mysql-test/main/alter_table_online.result
@@ -112,7 +112,7 @@ create table t1 (a int not null primary key, b int, c varchar(80));
 create table t2 (a int not null primary key, b int, c varchar(80));
 create table t3 (a int not null primary key, b int, c varchar(80)) engine=merge UNION=(t1);
 alter online table t3 union=(t1,t2);
-ERROR 0A000: LOCK=NONE/SHARED is not supported for this operation. Try LOCK=EXCLUSIVE
+ERROR 0A000: LOCK=NONE is not supported for this operation. Try LOCK=EXCLUSIVE
 drop table t1,t2,t3;
 create table t1 (i int) partition by hash(i) partitions 2;
 alter online table t1 comment 'test';