SET debug_sync='RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (pk INT PRIMARY KEY COMMENT "", a INT)engine=xengine;
INSERT INTO t1 VALUES(1,1), (2,2), (3,3);
SET debug_sync='xengine_concurrent_delete SIGNAL parked WAIT_FOR go';
SELECT * FROM t1 order by t1.pk ASC FOR UPDATE;
SET debug_sync='now WAIT_FOR parked';
DELETE FROM t1 WHERE pk = 1;
SET debug_sync='now SIGNAL go';
pk	a
2	2
3	3
set debug_sync='RESET';
drop table t1;
SET debug_sync='RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (pk INT PRIMARY KEY COMMENT "", a INT)engine=xengine;
INSERT INTO t1 VALUES(1,1), (2,2), (3,3);
SET debug_sync='xengine_concurrent_delete SIGNAL parked WAIT_FOR go';
SELECT * FROM t1 order by t1.pk DESC FOR UPDATE;
SET debug_sync='now WAIT_FOR parked';
DELETE FROM t1 WHERE pk = 3;
SET debug_sync='now SIGNAL go';
pk	a
2	2
1	1
set debug_sync='RESET';
drop table t1;
SET debug_sync='RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (pk INT PRIMARY KEY COMMENT "rev:cf2", a INT)engine=xengine;
INSERT INTO t1 VALUES(1,1), (2,2), (3,3);
SET debug_sync='xengine_concurrent_delete SIGNAL parked WAIT_FOR go';
SELECT * FROM t1 order by t1.pk ASC FOR UPDATE;
SET debug_sync='now WAIT_FOR parked';
DELETE FROM t1 WHERE pk = 1;
SET debug_sync='now SIGNAL go';
pk	a
2	2
3	3
set debug_sync='RESET';
drop table t1;
SET debug_sync='RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (pk INT PRIMARY KEY COMMENT "rev:cf2", a INT)engine=xengine;
INSERT INTO t1 VALUES(1,1), (2,2), (3,3);
SET debug_sync='xengine_concurrent_delete SIGNAL parked WAIT_FOR go';
SELECT * FROM t1 order by t1.pk DESC FOR UPDATE;
SET debug_sync='now WAIT_FOR parked';
DELETE FROM t1 WHERE pk = 3;
SET debug_sync='now SIGNAL go';
pk	a
2	2
1	1
set debug_sync='RESET';
drop table t1;