在阿里云数据库张初始化流程表时，报错误：[Err] 1071 - Specified key was too long

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在阿里云MySQL数据库初始化流程表时，报错误：[Err] 1071 - Specified key was too long; max key length is 767 bytes

数据库版本：5.7.26

执行的SQL和错误提示信息详细如下：

[SQL]

CREATE TABLE `ACT_APP_APPDEF` (

`ID_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,

`REV_` int(11) NOT NULL,

`NAME_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,

`KEY_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL,

`VERSION_` int(11) NOT NULL,

`CATEGORY_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,

`DEPLOYMENT_ID_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,

`RESOURCE_NAME_` varchar(4000) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,

`DESCRIPTION_` varchar(4000) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,

`TENANT_ID_` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT '',

PRIMARY KEY (`ID_`) USING BTREE,

UNIQUE INDEX `ACT_IDX_APP_DEF_UNIQ`(`KEY_`, `VERSION_`, `TENANT_ID_`) USING BTREE,

INDEX `ACT_IDX_APP_DEF_DPLY`(`DEPLOYMENT_ID_`) USING BTREE,

CONSTRAINT `ACT_FK_APP_DEF_DPLY` FOREIGN KEY (`DEPLOYMENT_ID_`) REFERENCES `ACT_APP_DEPLOYMENT` (`ID_`) ON DELETE RESTRICT ON UPDATE RESTRICT

) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci;

[Err] 1071 - Specified key was too long; max key length is 767 bytes

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