Re: [EXT] Re: Looking for tips on improving full-text search quality in Postgres

"Bayer, Samuel" <sam@mitre.org> writes:
> One concrete question, I suppose, is: the classic TF/IDF search strategy relies on inverse document frequency, which
looksacross the corpus. I can't tell whether that corpus-wide frequency information is taken into account in either
rankingfunction. 

The documentation is pretty clear that they don't, they just consider each
document in isolation.  Building a structure that would allow more-global
info to be taken into account is an interesting project that nobody's
tackled.

            regards, tom lane