DROP TABLE IF EXISTS t1;
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE   INDEX i1 USING BTREE ON t1(c1 ASC);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  KEY `i1` (`c1`) USING BTREE
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE   INDEX i1 USING BTREE ON t1(c1);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  KEY `i1` (`c1`) USING BTREE
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE UNIQUE INDEX i1 USING BTREE ON t1(c1 ASC);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  UNIQUE KEY `i1` (`c1`) USING BTREE
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE UNIQUE INDEX i1 USING BTREE ON t1(c1);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  UNIQUE KEY `i1` (`c1`) USING BTREE
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE   INDEX i1 USING HASH ON t1(c1);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  KEY `i1` (`c1`)
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE   INDEX i1 USING HASH ON t1(c1);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  KEY `i1` (`c1`)
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE UNIQUE INDEX i1 USING HASH ON t1(c1);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  UNIQUE KEY `i1` (`c1`)
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test
CREATE TABLE t1(c1 INTEGER NOT NULL);
CREATE UNIQUE INDEX i1 USING HASH ON t1(c1);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  UNIQUE KEY `i1` (`c1`)
) ENGINE=ENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
DROP INDEX i1 ON t1;
DROP TABLE t1;
SHOW TABLES;
Tables_in_test