Does the cached QueryWrapperFilter in CachedFilterBuilder help improve performance?

[hao yan <hy...@gmail.com>]

In CachedFilterBuilder, there are
1) (key=query, value=QueryWrapperFilter)
2) (key=filter, value = CachingWrapperFilter).

For cached CachingWrapperFilter, I can understand how it caches since the
underlying docIdSet is cached if it is cacheable, or is cloned if it is not
cacheable. Thus, the performance can be improved.

However, for QueryWrapperFilter, I am wondering how it can help
performance. It does not cache the underlying docIdSet. Thus, each time its
getDocIdSet is called, the entire scorer is built from scratch, right
(except the underlying posting list are cached somehow)? Can anybody help
me with this ?

thanks!

hao