似乎当投影包含非原始类型时，所有列都会包含在查询中.

It seems that when the projection contains non-primitive types, all columns will be included in the query.

这里已经有问题https://jira.spring.io/browse/DATAJPA-1218，而且从这个问题看来，目前无法通过预测解决这个问题.

There is already an issue here https://jira.spring.io/browse/DATAJPA-1218 , and it sounds from the issue that this can't be solved with projections for now.

这对你很有用 https://github.com/Blazebit/blaze-persistence一>，记录在此 实体视图一个>

This can be useful for you https://github.com/Blazebit/blaze-persistence , documented here Entity Views

它使用与投影类似的实现.

It uses similar implementation to projections.