#
# Bug#38691 segfault/abort in ``UPDATE ...JOIN'' while
#           ``FLUSH TABLES WITH READ LOCK''
# MySQL >= 5.0
#


# Save the initial number of concurrent sessions
--source include/count_sessions.inc

SET @odl_sync_frm = @@global.sync_frm;
SET @@global.sync_frm = OFF;

# Test to see if select will get the lock ahead of low priority update

connect (locker,localhost,root,,);
connect (writer,localhost,root,,);

--connection default
--disable_warnings
DROP TABLE IF EXISTS t1,t2,t3;
--enable_warnings

CREATE TABLE t1 (
  a int(11) unsigned default NULL,
  b varchar(255) default NULL,
  UNIQUE KEY a (a),
  KEY b (b)
);

INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3);
CREATE TABLE t2 SELECT * FROM t1;
CREATE TABLE t3 SELECT * FROM t1;

--echo # test altering of columns that multiupdate doesn't use

--echo # normal mode

--disable_query_log
let $i = 100;
while ($i) {
--dec $i

--connection writer
  send UPDATE t2 INNER JOIN (t1 JOIN t3 USING(a)) USING(a)
         SET a = NULL WHERE t1.b <> t2.b;

--connection locker
  ALTER TABLE t2 ADD COLUMN (c INT);
  ALTER TABLE t2 DROP COLUMN c;

--connection writer
--reap
}

--echo # PS mode

--connection writer
PREPARE stmt FROM 'UPDATE t2 INNER JOIN (t1 JOIN t3 USING(a)) USING(a)
                     SET a = NULL WHERE t1.b <> t2.b';

let $i = 100;
while ($i) {
--dec $i

--connection writer
--send EXECUTE stmt

--connection locker
  ALTER TABLE t2 ADD COLUMN (c INT);
  ALTER TABLE t2 DROP COLUMN c;

--connection writer
--reap
}
--enable_query_log


--echo # test altering of columns that multiupdate uses

--echo # normal mode

--connection default

--disable_query_log
let $i = 100;
while ($i) {
  dec $i;

--connection locker
--error 0,ER_DUP_FIELDNAME
  ALTER TABLE t2 ADD COLUMN a int(11) unsigned default NULL;
  UPDATE t2 SET a=b;

--connection writer
--send UPDATE t2 INNER JOIN (t1 JOIN t3 USING(a)) USING(a) SET a = NULL WHERE t1.b <> t2.b

--connection locker
--error 0,ER_CANT_DROP_FIELD_OR_KEY
  ALTER TABLE t2 DROP COLUMN a;

--connection writer
--error 0,ER_BAD_FIELD_ERROR
--reap
}
--enable_query_log

--echo # PS mode

--disable_query_log
let $i = 100;
while ($i) {
  dec $i;

--connection locker
--error 0,ER_DUP_FIELDNAME
  ALTER TABLE t2 ADD COLUMN a int(11) unsigned default NULL;
  UPDATE t2 SET a=b;

--connection writer
  PREPARE stmt FROM 'UPDATE t2 INNER JOIN (t1 JOIN t3 USING(a)) USING(a) SET a = NULL WHERE t1.b <> t2.b';
--send EXECUTE stmt

--connection locker
--error 0,ER_CANT_DROP_FIELD_OR_KEY
  ALTER TABLE t2 DROP COLUMN a;

--connection writer
--error 0,ER_BAD_FIELD_ERROR
--reap

}
--enable_query_log
--connection default
DROP TABLE t1, t2, t3;


# Close connections
--disconnect locker
--disconnect writer

SET @@global.sync_frm = @odl_sync_frm;

# Wait till all disconnects are completed
--source include/wait_until_count_sessions.inc