您遇到了 CASSANDRA-6276 。问题是，当您在Cassandra中删除一列时，该列中的数据不仅会消失，而且Cassandra可能会尝试使用其新的比较器类型读取该数据。

You're running into CASSANDRA-6276. The problem is when you drop a column in Cassandra that the data in that column doesn't just disappear, and Cassandra may attempt to read that data with its new comparator type.

从链接的JIRA故障单中：

From the linked JIRA ticket:

不幸的是，我们不允许从比较器中删除组件，包括从ColumnToCollectionType中删除单个集合列。
如果我们允许的话，并且拥有该类型的预先存在的数据，C *根本不知道如何比较这些数据。

Unfortunately, we can't allow dropping a component from the comparator, including dropping individual collection columns from ColumnToCollectionType. If we do allow that, and have pre-existing data of that type, C* simply wouldn't know how to compare those...

。 ..即使我们这样做了，并且允许[用户]创建一个具有相同名称的不同集合，我们也会遇到一个不同的问题：新集合的比较器将用于比较潜在的不兼容类型。

...even if we did, and allowed [users] to create a different collection with the same name, we'd hit a different issue: the new collection's comparator would be used to compare potentially incompatible types.

JIRA建议在Cassandra 3.x中这可能不是问题，但我只是在3.0.3中尝试过，但由于相同的错误而失败。 / p>

The JIRA suggests that this may not be an issue in Cassandra 3.x, but I just tried it in 3.0.3 and it fails with the same error.

我做错了什么？我是Cassandra的新手。有任何建议吗？

What did I do wrong? I am pretty new to Cassandra. Any suggestions?

不幸的是，解决这个问题的唯一方法是为新列表使用不同的名称。

Unfortunately, the only way around this one is to use a different name for your new list.