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From Mikhail Khludnev <>
Subject Re: How can I use FunctionScoreQuery to replace CustomScoreQuery?
Date Tue, 29 Jan 2019 13:34:35 GMT
I proposed to implement  DoubleValuesSource  with the custom logic, which
gives a scoring. But one can not search by DoubleValuesSource  one needs a
query for this, since a query provides a "selectivity" choosing certain
docs, and rejecting others.And a way to get the query is to wrap a base
query (in the worst case it's MatchAllDocsQuery) and custom
DoubleValuesSource by calling  FunctionScoreQuery.boostByValue(Query,

On Sun, Jan 27, 2019 at 9:34 PM MarcoR <>

> Thanks Mikhail,
> I'm afraid I don't understand your suggestion though.
> I worked more on DoubleValuesSource.fromField's implementation since
> sending
> my first email. As far as I can see, I need to write custom code in my
> DoubleValuesSource implementation and it will be used by the FilterScorer
> of
> FunctionScoreQuery. So I have one potential solution.
> I am curious about your suggestion. What do you mean when you say custom
> code can run custom logic, then it can wrap a query? The way
> FunctionScoreQuery is designed, whatever custom logic I'm supposed to
> introduce should go into DoubleValuesSource. Your suggestion seems to
> differ
> from that. Could you explain a bit more please?
> Thanks!
> Marco
> --
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Sincerely yours
Mikhail Khludnev

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