[Exist-open] getting the number of matches from ft:query without kwic:expand

[Lars B. <L.J...@uv...>]

Hi all,

I'm working on a faceted search engine. In the facets code, I'd like
to get the number of matches found by ft:query inside a hit, without
running the hit through ft:query. As an example, I currently do

    for $b in util:catch("*", ft:query($coll//vk:book, $qterms), ())
      order by ft:score($b)
      return $b

Lucene scores, however, aren't really presentable to my target
audience, so I tried

    order by count(kwic:expand($b)//exist:match)

but this may take up to a half a minute to run. Using util:expand
instead is no better. Is there a way to get just this count, without
doing the actual expansion? I looked at the docs and found that
text:match-count might do this, but that always returns zero (is it
for the old full-text index?).

TIA,
Lars


PS.: I know $coll//vk:book[ft:query(., $qterms)] is supposed to be
faster than my current expression, but that doesn't work: it never
returns any hits.

-- 
Lars Buitinck
Scientific programmer, ILPS
University of Amsterdam