So, for example, a getSize() method would return a total number of results, even though the actual objects are retrieved on demand.

所以，即使实际对象是随需检索的，getSize()方法也会返回一个结果的总数。

youdao

Another method is to swap the total return on the NCREIF index broken down by property sector, allowing investors to take a position in an alternate property sector in which they may not own properties, thus allowing investors to swap the returns from office related real estate for retail real estate.

FORBES: A Guide To Real Estate Derivatives