Add test cases to verify that SHOW CREATE TABLE always outputs the

key algorithm for keys where they were explicitly specified.

mysql-test/r/show_check.result

@@ -405,3 +405,73 @@ where user='mysqltest_1' || user='mysqltest_2' || user='mysqltest_3';
 delete from mysql.db   
 where user='mysqltest_1' || user='mysqltest_2' || user='mysqltest_3';
 flush privileges;
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` (`i`)
+) ENGINE=HEAP DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING HASH (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` TYPE HASH (`i`)
+) ENGINE=HEAP DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` TYPE BTREE (`i`)
+) ENGINE=HEAP DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` (`i`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` TYPE BTREE (`i`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` (`i`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ALTER TABLE t1 ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` (`i`)
+) ENGINE=HEAP DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` TYPE BTREE (`i`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ALTER TABLE t1 ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) default NULL,
+  KEY `i` TYPE BTREE (`i`)
+) ENGINE=HEAP DEFAULT CHARSET=latin1
+DROP TABLE t1;

mysql-test/t/show_check.test

@@ -321,3 +321,35 @@ flush privileges;
 #--replace_column 7 # 8 # 9 #
 #show table status from `` LIKE '';
 #drop database ``;
+
+# Test that USING <keytype> is always shown in SHOW CREATE TABLE when it was
+# specified during table creation, but not otherwise. (Bug #7235)
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING HASH (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+# Test that when an index is created with the default key algorithm and
+# altered to another storage engine, it gets the default key algorithm
+# for that storage engine, but when it is specified, the specified type is
+# preserved.
+CREATE TABLE t1 (i int, KEY (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i int, KEY USING BTREE (i)) ENGINE=MyISAM;
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 ENGINE=MEMORY;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;