Master GTT overrides the slave table with the same name

-- source include/master-slave.inc

-- source include/have_binlog_format_statement.inc

connection master;

connection slave;

--connection slave

CREATE TABLE mygtt (c CHAR(20));

INSERT INTO mygtt VALUES ('slave innodb data');

query_vertical SHOW CREATE TABLE mygtt;

SELECT * FROM mygtt;

--connection master

CREATE GLOBAL TEMPORARY TABLE mygtt (i INT, t TEXT);

INSERT INTO mygtt VALUES (1, 'master mygtt table data');

--connection slave

SELECT * FROM mygtt;

SHOW TABLES;

query_vertical SHOW CREATE TABLE mygtt;

$ ./mtr --suite=rpl my.test

Logging: ./mtr  --suite=rpl my.test

VS config: 

vardir: /test/MDEV-35915-MD311025-mariadb-12.2.0-linux-x86_64-opt/mariadb-test/var

Checking leftover processes...

Removing old var directory...

Creating var directory '/test/MDEV-35915-MD311025-mariadb-12.2.0-linux-x86_64-opt/mariadb-test/var'...

Checking supported features...

MariaDB Version 12.2.0-MariaDB

 - SSL connections supported

Collecting tests...

Installing system database...

==============================================================================

TEST                                      RESULT   TIME (ms) or COMMENT

--------------------------------------------------------------------------

worker[01] Using MTR_BUILD_THREAD 300, with reserved ports 19000..19029

include/master-slave.inc

[connection master]

connection master;

connection slave;

connection slave;

CREATE TABLE mygtt (c CHAR(20));

INSERT INTO mygtt VALUES ('slave innodb data');

SHOW CREATE TABLE mygtt;

Table	mygtt

Create Table	CREATE TABLE `mygtt` (

  `c` char(20) DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci

SELECT * FROM mygtt;

c

slave innodb data

connection master;

CREATE GLOBAL TEMPORARY TABLE mygtt (i INT, t TEXT);

INSERT INTO mygtt VALUES (1, 'master mygtt table data');

connection slave;

SELECT * FROM mygtt;

i	t

SHOW TABLES;

Tables_in_test

mygtt

SHOW CREATE TABLE mygtt;

Table	mygtt

Create Table	CREATE GLOBAL TEMPORARY TABLE `mygtt` (

  `i` int(11) DEFAULT NULL,

  `t` text DEFAULT NULL

) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci ON COMMIT DELETE ROWS

rpl.my 'stmt'                            [ pass ]    157