Add support for "reverted index"

Issue #36 new
Matt Chaput
repo owner created an issue

This blog post describes an interesting "champion list"-like extension to the inverted index, called a "reverted index".

This would be very straightforward to implement in Whoosh as a one-off, but it would be better to look for a way to generalize the creation of the inverted index, term vectors, and reverted index, which are essentially variations on the same storage mechanisms.