DDL任务无法删除或取消

[yahaier]

1、创建表： CREATE TABLE test ( col1 varchar(255) DEFAULT NULL, col2 varchar(255) NOT NULL, id int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (id,col2) ) ENGINE = InnoDB DEFAULT CHARSET = utf8 ;

2、删除col2主键字段 ALTER TABLE test DROP PRIMARY KEY, DROP COLUMN col2, ADD PRIMARY KEY (id) USING BTREE;

报错：Failed to execute the DDL task. Caused by: Illegal Capacity: -1

4、执行SHOW FULL DDL有条DDL任务执行失败，状态为：PAUSED

5、执行 CANCEL DDL job_id无法取消DDL任务

[mybjlife]

Thanks for your findings.

We can reproduce this issue and already fixed it via PR #117 in the project 'galaxysql'.