Using large objects as index keys is disallowed because they cannot, in general, be compared and sequenced.

不允许使用大对象作为索引键，因为一般情况下不能够对大对象进行比较和排序。

youdao

Using large objects as index keys is disallowed because they cannot, in general, be compared and sequenced.

不允许使用大对象作为索引键，因为一般情况下不能够对大对象进行比较和排序。

youdao