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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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3
mysql-test/suite/innodb/r/instant_alter_debug.result
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@ -171,6 +171,7 @@ connect stop_purge,localhost,root;
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connect ddl,localhost,root,,test;
DELETE FROM t1;
INSERT INTO t1 VALUES(1, 2);
SET DEBUG_SYNC='row_log_table_apply1_before SIGNAL copied WAIT_FOR logged';
ALTER TABLE t1 FORCE;
connection default;
@ -449,6 +450,7 @@ DROP TABLE t1;
CREATE TABLE t1
(a INT NOT NULL, b INT, c INT, d INT, e INT, f INT, g INT, h INT, i TEXT)
ENGINE=InnoDB;
INSERT INTO t1 VALUES(1, 2, 3, 4, 5, 6, 7, 8, "test");
ALTER TABLE t1 MODIFY a INT NULL;
SET DEBUG_SYNC='innodb_inplace_alter_table_enter SIGNAL alter WAIT_FOR go';
ALTER TABLE t1 ADD PRIMARY KEY (a);
@ -462,6 +464,7 @@ connection default;
disconnect con1;
SELECT * FROM t1;
a b c d e f g h i
1 2 3 4 5 6 7 8 test
DROP TABLE t1;
SET DEBUG_SYNC=RESET;
# End of 10.4 tests