译：删除所有文档及整个集合。

It deletes the entire documents and drop the collection.

youdao

所有的注释、XML声明、以及文档类型声明，都必须删除。

All comments, the XML declaration, and the document type declaration MUST be removed.

youdao

另一种方式是使用带注释的模式分解将所有新文档分解到现有的副表，只修改列类型而不删除副表。

An alternate approach could be to use an annotated schema shred to decompose all new documents to existing side tables, and only change the column type without dropping the side tables.

youdao