--source include/have_innodb.inc
--source include/have_debug.inc

--enable_connect_log

--echo #
--echo # Bug #19471516 SERVER CRASHES WHEN EXECUTING ALTER TABLE
--echo # ADD FOREIGN KEY
--echo #

CREATE TABLE `department` (`department_id` INT, `department_people_fk` INT,
PRIMARY KEY (`department_id`)) engine=innodb;

CREATE TABLE `title` (`title_id` INT, `title_manager_fk` INT,
`title_reporter_fk` INT, PRIMARY KEY (`title_id`)) engine=innodb;

CREATE TABLE `people` (`people_id` INT, PRIMARY KEY (`people_id`)) engine=innodb;

ALTER TABLE `department` ADD FOREIGN KEY (`department_people_fk`) REFERENCES
`people` (`people_id`);

ALTER TABLE `title` ADD FOREIGN KEY (`title_manager_fk`) REFERENCES `people`
(`people_id`);

ALTER TABLE `title` ADD FOREIGN KEY (`title_reporter_fk`) REFERENCES `people`
(`people_id`);

drop table title, department, people;

#
# FK and prelocking:
# child table accesses (reads and writes) wait for locks.
#
create table t1 (a int primary key, b int) engine=innodb;
create table t2 (c int primary key, d int,
  foreign key (d) references t1 (a) on update cascade) engine=innodb;
insert t1 values (1,1),(2,2),(3,3);
insert t2 values (4,1),(5,2),(6,3);
flush table t2 with read lock; # this takes MDL_SHARED_NO_WRITE
connect (con1,localhost,root);
--error ER_ROW_IS_REFERENCED_2
delete from t1 where a=2;
send update t1 set a=10 where a=1;
connection default;
let $wait_condition= select 1 from information_schema.processlist where state='Waiting for table metadata lock';
source include/wait_condition.inc;
unlock tables;
connection con1;
reap;
connection default;
lock table t2 write; # this takes MDL_SHARED_NO_READ_WRITE
connection con1;
send delete from t1 where a=2;
connection default;
let $wait_condition= select 1 from information_schema.processlist where state='Waiting for table metadata lock';
source include/wait_condition.inc;
unlock tables;
connection con1;
--error ER_ROW_IS_REFERENCED_2
reap;
connection default;
unlock tables;
disconnect con1;

# but privileges should not be checked
create user foo;
grant select,update on test.t1 to foo;
connect(foo,localhost,foo);
update t1 set a=30 where a=3;
disconnect foo;
connection default;
select * from t2;
drop table t2, t1;
drop user foo;