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MDEV-8577: With enforce-storage-engine mysql_upgrade corrupts the schema:
ALTER TABLE should either bypass enforce-storage-engine, or mysql_upgrade should refuse to run Allow user to alter contents of existing table without enforcing storage engine. However, enforce storage engine on ALTER TABLE x ENGINE=y;
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‎mysql-test/r/enforce_storage_engine.result‎

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@@ -122,3 +122,33 @@ DROP TABLE t1;
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set global sql_mode=default;
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SET SESSION enforce_storage_engine=NULL;
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SET GLOBAL enforce_storage_engine=NULL;
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CREATE TABLE t3 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
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INSERT INTO t3 values (NULL, 'test');
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SET SESSION enforce_storage_engine=Memory;
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ALTER TABLE t3 ENGINE=MyISAM;
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Warnings:
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Note 1266 Using storage engine MEMORY for table 't3'
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SHOW CREATE TABLE t3;
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Table Create Table
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t3 CREATE TABLE `t3` (
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`c1` int(11) NOT NULL AUTO_INCREMENT,
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`c2` varchar(10) DEFAULT NULL,
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PRIMARY KEY (`c1`)
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) ENGINE=MEMORY AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
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DROP TABLE t3;
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SET SESSION enforce_storage_engine=NULL;
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CREATE TABLE t3 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
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INSERT INTO t3 values (NULL, 'test');
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SET SESSION enforce_storage_engine=Memory;
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ALTER TABLE t3 ADD COLUMN c3 INT;
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SHOW CREATE TABLE t3;
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Table Create Table
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t3 CREATE TABLE `t3` (
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`c1` int(11) NOT NULL AUTO_INCREMENT,
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`c2` varchar(10) DEFAULT NULL,
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`c3` int(11) DEFAULT NULL,
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PRIMARY KEY (`c1`)
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) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
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DROP TABLE t3;
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SET SESSION enforce_storage_engine=NULL;
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SET GLOBAL enforce_storage_engine=NULL;

‎mysql-test/r/mysql_upgrade.result‎

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@@ -459,4 +459,64 @@ even_longer_user_name_number_3_to_test_the_grantor_and_definer_field_length@loca
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DROP USER very_long_user_name_number_1, very_long_user_name_number_2, even_longer_user_name_number_3_to_test_the_grantor_and_definer_field_length@localhost;
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DROP PROCEDURE test.pr;
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set sql_mode=default;
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# Droping the previously created mysql_upgrade_info file..
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create table test.t1(a int) engine=MyISAM;
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# Trying to enforce InnoDB for all tables
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SET GLOBAL enforce_storage_engine=InnoDB;
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Phase 1/6: Checking and upgrading mysql database
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Processing databases
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mysql
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mysql.column_stats OK
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mysql.columns_priv OK
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mysql.db OK
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mysql.event OK
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mysql.func OK
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mysql.gtid_slave_pos OK
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mysql.help_category OK
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mysql.help_keyword OK
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mysql.help_relation OK
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mysql.help_topic OK
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mysql.host OK
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mysql.index_stats OK
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mysql.innodb_index_stats OK
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mysql.innodb_table_stats OK
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mysql.plugin OK
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mysql.proc OK
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mysql.procs_priv OK
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mysql.proxies_priv OK
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mysql.roles_mapping OK
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mysql.servers OK
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mysql.table_stats OK
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mysql.tables_priv OK
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mysql.time_zone OK
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mysql.time_zone_leap_second OK
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mysql.time_zone_name OK
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mysql.time_zone_transition OK
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mysql.time_zone_transition_type OK
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mysql.user OK
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Phase 2/6: Fixing views
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Phase 3/6: Running 'mysql_fix_privilege_tables'
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Phase 4/6: Fixing table and database names
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Phase 5/6: Checking and upgrading tables
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Processing databases
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information_schema
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mtr
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mtr.global_suppressions OK
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mtr.test_suppressions OK
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performance_schema
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test
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test.t1 OK
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Phase 6/6: Running 'FLUSH PRIVILEGES'
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OK
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# Should return 2
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SELECT count(*) FROM information_schema.tables where ENGINE="InnoDB";
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count(*)
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2
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SHOW CREATE TABLE test.t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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DROP TABLE test.t1;
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SET GLOBAL enforce_storage_engine=NULL;
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End of tests

‎mysql-test/t/enforce_storage_engine.test‎

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@@ -87,3 +87,25 @@ disconnect con1;
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set global sql_mode=default;
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SET SESSION enforce_storage_engine=NULL;
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SET GLOBAL enforce_storage_engine=NULL;
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#
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# MDEV-8577: With enforce-storage-engine mysql_upgrade corrupts the schema:
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# ALTER TABLE should either bypass enforce-storage-engine, or mysql_upgrade
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# should refuse to run
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#
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CREATE TABLE t3 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
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INSERT INTO t3 values (NULL, 'test');
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SET SESSION enforce_storage_engine=Memory;
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ALTER TABLE t3 ENGINE=MyISAM;
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SHOW CREATE TABLE t3;
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DROP TABLE t3;
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SET SESSION enforce_storage_engine=NULL;
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CREATE TABLE t3 (c1 INT PRIMARY KEY AUTO_INCREMENT, c2 VARCHAR(10)) ENGINE=MyISAM;
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INSERT INTO t3 values (NULL, 'test');
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SET SESSION enforce_storage_engine=Memory;
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ALTER TABLE t3 ADD COLUMN c3 INT;
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SHOW CREATE TABLE t3;
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DROP TABLE t3;
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SET SESSION enforce_storage_engine=NULL;
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SET GLOBAL enforce_storage_engine=NULL;

‎mysql-test/t/mysql_upgrade.test‎

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Original file line numberDiff line numberDiff line change
@@ -161,4 +161,27 @@ DROP USER very_long_user_name_number_1, very_long_user_name_number_2, even_longe
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DROP PROCEDURE test.pr;
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set sql_mode=default;
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#
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# Enforce storage engine option should not effect mysql_upgrade
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#
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--echo # Droping the previously created mysql_upgrade_info file..
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--remove_file $MYSQLD_DATADIR/mysql_upgrade_info
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create table test.t1(a int) engine=MyISAM;
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--echo # Trying to enforce InnoDB for all tables
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SET GLOBAL enforce_storage_engine=InnoDB;
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--replace_result $MYSQLTEST_VARDIR var
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--exec $MYSQL_UPGRADE --force 2>&1
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--echo # Should return 2
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SELECT count(*) FROM information_schema.tables where ENGINE="InnoDB";
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SHOW CREATE TABLE test.t1;
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DROP TABLE test.t1;
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# mysql_upgrade must have created mysql_upgrade_info file,
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# so the following command should never fail.
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--remove_file $MYSQLD_DATADIR/mysql_upgrade_info
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SET GLOBAL enforce_storage_engine=NULL;
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--echo End of tests

‎sql/sql_table.cc‎

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Original file line numberDiff line numberDiff line change
@@ -9818,14 +9818,21 @@ static bool check_engine(THD *thd, const char *db_name,
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DBUG_ENTER("check_engine");
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handlerton **new_engine= &create_info->db_type;
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handlerton *req_engine= *new_engine;
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handlerton *enf_engine= thd->variables.enforced_table_plugin ?
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plugin_hton(thd->variables.enforced_table_plugin) : NULL;
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handlerton *enf_engine= NULL;
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bool no_substitution= thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION;
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*new_engine= ha_checktype(thd, req_engine, no_substitution);
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DBUG_ASSERT(*new_engine);
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if (!*new_engine)
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DBUG_RETURN(true);
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/* Enforced storage engine should not be used in
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ALTER TABLE that does not use explicit ENGINE = x to
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avoid unwanted unrelated changes.*/
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if (!(thd->lex->sql_command == SQLCOM_ALTER_TABLE &&
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!(create_info->used_fields & HA_CREATE_USED_ENGINE)))
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enf_engine= thd->variables.enforced_table_plugin ?
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plugin_hton(thd->variables.enforced_table_plugin) : NULL;
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if (enf_engine && enf_engine != *new_engine)
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{
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if (no_substitution)

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