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MDEV-18875 Assertion `thd->transaction.stmt.ha_list == __null || trans == &thd->transaction.stmt' failed or bogus ER_DUP_ENTRY upon ALTER TABLE with versioning

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Cause:
* when autocommit=0 (or transaction is issued by user),
 `ha_commit_trans` is called twice on ALTER TABLE, causing a duplicated
 insert into `transaction_registry` (ER_DUP_ENTRY).

Solution:
* ALTER TABLE makes an implicit commit by a second call. We actually
 need to make an insert only when it is a real commit. So is_real
 variable is additionally checked.
This commit is contained in:
Nikita Malyavin
2019-03-22 16:26:42 +10:00
committed by Marko Mäkelä
parent 808bc919eb
commit 720e9bd5be
3 changed files with 30 additions and 1 deletions
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13
mysql-test/suite/versioning/r/trx_id.result
View File

@ -476,3 +476,16 @@ SET @@SYSTEM_VERSIONING_ALTER_HISTORY=ERROR;
SELECT count(*) from mysql.transaction_registry where begin_timestamp>=commit_timestamp;
count(*)
0
# MDEV-18875 Assertion `thd->transaction.stmt.ha_list == __null ||
# trans == &thd->transaction.stmt' failed or bogus ER_DUP_ENTRY upon
# ALTER TABLE with versioning
create or replace table t (x int) engine=innodb;
set autocommit= 0;
alter table t
algorithm=copy,
add column row_start bigint unsigned as row start,
add column row_end bigint unsigned as row end,
add period for system_time(row_start,row_end),
with system versioning;
set autocommit= 1;
create or replace database test;

15
mysql-test/suite/versioning/t/trx_id.test
View File

@ -498,3 +498,18 @@ DROP TABLE t;
SET @@SYSTEM_VERSIONING_ALTER_HISTORY=ERROR;
SELECT count(*) from mysql.transaction_registry where begin_timestamp>=commit_timestamp;
--echo # MDEV-18875 Assertion `thd->transaction.stmt.ha_list == __null ||
--echo # trans == &thd->transaction.stmt' failed or bogus ER_DUP_ENTRY upon
--echo # ALTER TABLE with versioning
create or replace table t (x int) engine=innodb;
set autocommit= 0;
alter table t
algorithm=copy,
add column row_start bigint unsigned as row start,
add column row_end bigint unsigned as row end,
add period for system_time(row_start,row_end),
with system versioning;
set autocommit= 1;
create or replace database test;

3
sql/handler.cc
View File

@ -1446,7 +1446,8 @@ int ha_commit_trans(THD *thd, bool all)
#if 1 // FIXME: This should be done in ha_prepare().
if (rw_trans || (thd->lex->sql_command == SQLCOM_ALTER_TABLE &&
thd->lex->alter_info.flags & ALTER_ADD_SYSTEM_VERSIONING))
thd->lex->alter_info.flags & ALTER_ADD_SYSTEM_VERSIONING &&
is_real_trans))
{
ulonglong trx_start_id= 0, trx_end_id= 0;
for (Ha_trx_info *ha_info= trans->ha_list; ha_info; ha_info= ha_info->next())