Hi,
in that case you should use something like 1/x as your scoring function
in the sub-clauses. In Lucene scores should go up for more relevancy.
This must also apply for function scoring.
Uwe
Am 09.11.2023 um 19:14 schrieb Marc D'Mello:
Hi Michael,
Thanks for the response! So to answer your first question, yes this would
keep the lowest score from the matching sub-scorers. Our use case is that
we have a custom term-level score overriding term frequency and we want to
take the min of that as part of our scoring function. Maybe it's a niche
use case?
Thanks,
Marc
On Wed, Nov 8, 2023 at 3:19 PM Michael Froh <msf...@gmail.com> wrote:
Hi Marc,
Can you clarify what the semantics of a DisjunctionMinQuery would be? Would
you keep the score for the *lowest* scoring disjunct (plus some tiebreaker
applied to the other matching disjuncts)?
I'm trying to imagine how that would work compared to the classic DisMax
use-case. Say I'm searching for "dalmatian" using a DisMax query over term
queries against title and body. A match on title is probably going to score
higher than a match against the body, just because the title has a shorter
length (and the doc frequency of individual terms in the title is likely to
be lower, since there are fewer terms overall). With DisMax, a match on
title alone will score higher than a match on body, and the tie-break will
tend to score a match on title and body higher than a match on title alone.
With a DisMin (assuming you keep the lowest score), then a match on title
and body would probably score lower than a match on title alone. That feels
weird to me, but I might be missing the use-case.
How would you use a DisMinQuery?
Thanks,
Froh
On Wed, Nov 8, 2023 at 10:50 AM Marc D'Mello <marcd2...@gmail.com> wrote:
Hi all,
I noticed we have a DisjunctionMaxQuery
<
https://github.com/apache/lucene/blob/branch_9_7/lucene/core/src/java/org/apache/lucene/search/DisjunctionMaxQuery.java
but
not a corresponding DisjunctionMinQuery. I was just wondering if there
was
a specific reason for that? Or is it just that it is not a common query
to
use?
Thanks!
Marc
--
Uwe Schindler
Achterdiek 19, D-28357 Bremen
https://www.thetaphi.de
eMail: u...@thetaphi.de
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