#
# Bug#24571427 MYSQLDUMP & MYSQLPUMP MAY FAIL WHEN
#              DDL STATEMENTS ARE RUNNING
#
SET DEBUG_SYNC= 'RESET';
DROP SCHEMA IF EXISTS test_i_s;
CREATE SCHEMA test_i_s;
USE test_i_s;
CREATE TABLE t1(a INT) ENGINE=MyISAM;
SET DEBUG_SYNC='alter_table_before_rename_result_table SIGNAL blocked WAIT_FOR i_s_select';
# Sending ALTER Command
ALTER TABLE t1 modify column a varchar(30);;
# Wait until ALTER stopped before renaming the temporary file it created.
SET DEBUG_SYNC= 'now WAIT_FOR blocked';
# Verify that #sql... tables are not seen by I_S and SHOW
SELECT COUNT(TABLE_NAME) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='test_i_s' AND TABLE_NAME like '#sql%';
COUNT(TABLE_NAME)
0
SHOW TABLES FROM test_i_s;
Tables_in_test_i_s
t1
# Check that there exists a hidden table created by ALTER and
# I_S.TABLES had not listed above. The SHOW EXTENDED syntax was
# added as part of Bug#24786075.
SHOW EXTENDED TABLES FROM test_i_s;
Tables_in_test_i_s
#sql-xxxxx
t1
# Make sure mysqldump/mysqlpump ignores the #sql... tables.
# mysqldump fails to acquire the lock without the fix.
# Allow ALTER to continue.
SET DEBUG_SYNC= 'now SIGNAL i_s_select';
# Reaping "ALTER ..."
# Verify if the ALTERed TABLE is not-hidden
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='test_i_s';
TABLE_NAME
t1
# Verify if  inplace alter also keeps the table not-hidden.
ALTER TABLE t1 add column (c2 int);
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='test_i_s';
TABLE_NAME
t1
SET DEBUG_SYNC= 'RESET';
SET GLOBAL DEBUG='';
DROP SCHEMA test_i_s;