SET @table_schema = DATABASE();

SET @ddl = IF(
    EXISTS(
        SELECT 1
        FROM information_schema.COLUMNS
        WHERE TABLE_SCHEMA = @table_schema
          AND TABLE_NAME = 'user_history_identity'
          AND COLUMN_NAME = 'is_yumi_manager'
    ),
    'SELECT 1',
    "ALTER TABLE `user_history_identity` ADD COLUMN `is_yumi_manager` tinyint(1) NOT NULL DEFAULT 0 COMMENT '是否做过Yumi团队经理' AFTER `is_manager`"
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;