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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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2
mysql-test/suite/innodb_fts/r/misc_debug.result
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@ -30,6 +30,7 @@ DROP TABLE t2, t1;
# MDEV-25200 Index count mismatch due to aborted FULLTEXT INDEX
#
CREATE TABLE t1(a INT, b TEXT, c TEXT, FULLTEXT INDEX(b)) ENGINE=InnoDB;
INSERT INTO t1 VALUES(1, "test", "test_1");
connect con1,localhost,root,,test;
SET DEBUG_DBUG="+d,innodb_OOM_inplace_alter";
SET DEBUG_SYNC='innodb_commit_inplace_alter_table_enter SIGNAL s2 WAIT_FOR g2';
@ -39,6 +40,7 @@ SET DEBUG_SYNC='now WAIT_FOR s2';
START TRANSACTION;
SELECT * FROM t1;
a b c
1 test test_1
SET DEBUG_SYNC='now SIGNAL g2';
connection con1;
ERROR HY000: Out of memory.