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From Joel Bernstein <>
Subject Re: Changing scoring in RankQuery
Date Fri, 15 Jul 2016 16:43:55 GMT
I think you'll have to handle the complexities you describe if you use the

The RankQuery does bring with it a fair amount of complexity to get
everything right. The ReRankQParserPlugin provides a pretty good example to

Joel Bernstein

On Fri, Jul 15, 2016 at 8:07 AM, Ankit Singh <> wrote:

> Hi,
> I am trying to understand how to influence scoring via RankQuery in solr >=
> 4.9. My requirements are two fold:
> 1) Use a custom collector
> 2) Change scoring of docs
> As far as i could understand, if we just want to change the scoring, we can
> write a QueryParserPlugin and extend CustomScoreQuery to introduce a
> CustomScoreProvider and modify the customScore method so that whenever we
> call scorer.score(), this new custom scorer would be used. This works
> perfectly in isolation (not using RankQuery).
> However, i want to use a custom scorer in my query object extending
> RankQuery (where i am setting a custom collector). One way to do this is to
> override the setScorer method and initialise an object of the new scorer
> here. The problem i'm experiencing here is that to modify the scoring
> explanation, i would need to rewrite the weight class which is one
> complexity i am trying to avoid. I would need the same scorer in a
> post-filter i wrote, and going by this method, i would need to set the
> scorer even in the post-filter.
> Is there another way to change scoring of docs while also using RankQuery
> API, which lets us change the explanation in an easier way?
> Regards,
> Ankit Singh

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