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The MySQL table types

CREATE TABLE heap2 TYPE=HEAP SELECT name FROM myisam1;
ALTER TABLE heap2 ADD INDEX(name);

* HEAP indexes cannot be built on BLOB or TEXT fields
* HEAP tables cannot use partial keys (prefixes)
* HEAP tables do not support AUTO_INCREMENT fields
* HEAP indexes can only use the '=' and '<=>' operators
* HEAP indexes cannot be used to return an 'ORDER BY' result.
* HEAP indexes cannot provide information on how many records are between two results, which would assist the optimizer in its choice of index.

MySQL AB :: MySQL 4.1 リファレンスマニュアル :: 9.4.7 SHOW FULL COLUMNS
SHOW FULL COLUMNS FROM a;