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MDEV-23805 Make Online DDL to Instant DDL when table is empty

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- In ha_innobase::prepare_inplace_alter_table(), InnoDB should
check whether the table is empty. If the table is empty then
server should avoid downgrading the MDL after prepare phase.
It is more like instant alter, does change only in dicationary
and metadata.

- Changed few debug test case to make non-empty DDL table
This commit is contained in:
Thirunarayanan Balathandayuthapani
2021-11-12 17:46:35 +05:30
parent c5380c30b5
commit d270525dfd
23 changed files with 73 additions and 13 deletions
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5
mysql-test/suite/innodb/r/innodb-index-debug.result
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@ -81,6 +81,7 @@ COUNT(k1) k2 k3
drop table t1;
create table t1(k1 int auto_increment primary key,
k2 char(200),k3 char(200))engine=innodb;
INSERT INTO t1 VALUES(1, "test", "test");
SET DEBUG_SYNC= 'row_merge_after_scan
SIGNAL opened WAIT_FOR flushed';
ALTER TABLE t1 FORCE, ADD COLUMN k4 int;
@ -100,6 +101,7 @@ SELECT COUNT(k1),k2,k3 FROM t1 GROUP BY k2,k3;
COUNT(k1) k2 k3
480 aaa bbb
480 aaaa bbbb
1 test test
disconnect con1;
connection default;
show create table t1;
@ -109,7 +111,7 @@ t1 CREATE TABLE `t1` (
`k2` char(200) DEFAULT NULL,
`k3` char(200) DEFAULT NULL,
PRIMARY KEY (`k1`)
) ENGINE=InnoDB AUTO_INCREMENT=1023 DEFAULT CHARSET=latin1
) ENGINE=InnoDB AUTO_INCREMENT=1024 DEFAULT CHARSET=latin1
drop table t1;
drop table t480;
#
@ -117,6 +119,7 @@ drop table t480;
# in online table rebuild
#
CREATE TABLE t1 (j INT UNIQUE, i INT UNIQUE) ENGINE=InnoDB;
INSERT INTO t1 VALUES(2, 2);
connect con1,localhost,root,,test;
SET DEBUG_SYNC='row_log_table_apply1_before SIGNAL built WAIT_FOR log';
ALTER TABLE t1 DROP j, FORCE;