It's not exactly a bug, just a side effect of Open Source when it's done by a motley crew of people all around the world with no "product owner" and no incentives to use a common programming style (or run extensive regression tests, or <insert your complaint here>).
在HiveQL中，alter命令不使用与create或select相同的语义 ;
具体来说，您不能使用“ALTER DATABASE.TABLE”表示法。如果您尝试，那么HQL解析器就会失败并显示一条奇怪的错误消息。
你只需要alter tablename 即可， 不需要带database。