--disable_warnings
let $ENGINE=`select variable_value from performance_schema.global_variables where variable_name='DEFAULT_STORAGE_ENGINE'`;
--enable_warnings

--disable_warnings
DROP TABLE IF EXISTS t9;
--enable_warnings
CREATE TABLE t9(c1 CHAR(20) NOT NULL PRIMARY KEY);
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; 
ALTER TABLE t9 DROP PRIMARY KEY;
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; DROP TABLE t9; SHOW TABLES;
CREATE TABLE t9(c1 VARCHAR(20) NOT NULL PRIMARY KEY);
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; 
ALTER TABLE t9 DROP PRIMARY KEY;
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; DROP TABLE t9; SHOW TABLES;
CREATE TABLE t9(c1 BINARY(20) NOT NULL PRIMARY KEY);
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; 
ALTER TABLE t9 DROP PRIMARY KEY;
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; DROP TABLE t9; SHOW TABLES;
CREATE TABLE t9(c1 VARBINARY(20) NOT NULL PRIMARY KEY);
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; 
ALTER TABLE t9 DROP PRIMARY KEY;
SHOW TABLES; 
--replace_result $ENGINE ENGINE " PAGE_CHECKSUM=0" ""
 SHOW CREATE TABLE t9; DROP TABLE t9; SHOW TABLES;