drop table if exists t1,t2,t3,t4,t5,t6;
#
# Bug#26379 - Combination of FLUSH TABLE and REPAIR TABLE
#             corrupts a MERGE table
# Problem #3
#
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
LOCK TABLE t1 WRITE;
# connection con1
SET SESSION debug="+d,sleep_open_and_lock_after_open";
INSERT INTO t1 VALUES (1);
# connection default
# Let INSERT go into thr_multi_lock().
# Kick INSERT out of thr_multi_lock().
FLUSH TABLES;
# Let INSERT go through open_tables() where it sleeps.
# Unlock and close table and wait for con1 to close too.
FLUSH TABLES;
# This should give no result.
SELECT * FROM t1;
c1
UNLOCK TABLES;
# connection con1
SET SESSION debug="-d,sleep_open_and_lock_after_open";
# connection default
DROP TABLE t1;
#
# Extra tests for Bug#26379 - Combination of FLUSH TABLE and
#                             REPAIR TABLE corrupts a MERGE table
#
CREATE TABLE t1 (c1 INT);
CREATE TABLE t2 (c1 INT);
CREATE TABLE t3 (c1 INT);
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
INSERT INTO t3 VALUES (3);
#
# CREATE ... SELECT
# try to access parent from another thread.
#
# connection con1
SET SESSION debug="+d,sleep_create_select_before_lock";
CREATE TABLE t4 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2)
INSERT_METHOD=FIRST SELECT * FROM t3;
# connection default
# Now try to access the parent.
# If 3 is in table, SELECT had to wait.
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
# connection con1
SET SESSION debug="-d,sleep_create_select_before_lock";
# connection default
# Cleanup for next test.
DROP TABLE t4;
DELETE FROM t1 WHERE c1 != 1;
#
# CREATE ... SELECT
# try to access child from another thread.
#
# connection con1
SET SESSION debug="+d,sleep_create_select_before_lock";
CREATE TABLE t4 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2)
INSERT_METHOD=FIRST SELECT * FROM t3;
# connection default
# Now try to access a child.
# If 3 is in table, SELECT had to wait.
SELECT * FROM t1 ORDER BY c1;
c1
1
3
# connection con1
SET SESSION debug="-d,sleep_create_select_before_lock";
# connection default
DROP TABLE t1, t2, t3, t4;