[jira] [Commented] (LUCENE-7517) Explore making Scorer.score() return a double

["Uwe Schindler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-7517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15595047#comment-15595047 ] 

Uwe Schindler commented on LUCENE-7517:
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I agree here, especially with Robert's comment: We should store and return scores as float to the user (a double makes no sense, because it leads to wrong expectations for users - who always tend to misuse scores for stuff they are not made for: they are just there to compare to search results and bring them in right order; for that we should use the float, so minor calculation differences don't matter). But when we actually calculate the score we should use double precision for all calculation steps.

The good thing: at the end we round everything to a float, so some differences by order of clauses would be removed during this round at end before it goes to TopDocs.

> Explore making Scorer.score() return a double
> ---------------------------------------------
>
>                 Key: LUCENE-7517
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7517
>             Project: Lucene - Core
>          Issue Type: Wish
>            Reporter: Adrien Grand
>            Priority: Minor
>
> Follow-up to http://search-lucene.com/m/l6pAi1BoyPJ1vr2382&subj=Re+JENKINS+EA+Lucene+Solr+master+Linux+64bit+jdk+9+ea+140+Build+18103+Unstable+.
> We could make Scorer.score() return a double in order to lose less accuracy when combining scores together, while still using floats on TopDocs and more generally all parts of the code that need to store scores.



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