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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-7347) Remove queryNorm and coords
Date Mon, 20 Jun 2016 13:28:05 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-7347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339481#comment-15339481
] 

David Smiley commented on LUCENE-7347:
--------------------------------------

Is boolean coord really only applicable to TF-IDF?  It seems like a universal concept that
isn't intrinsically tied to specific scoring formulas -- i.e. I could extend any Similarity
and override coord() to my liking.  I'd hate to see it go.

> Remove queryNorm and coords
> ---------------------------
>
>                 Key: LUCENE-7347
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7347
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>
> These two features are specific to TF-IDF and introduce some complexity (see eg. handling
of coords in BooleanWeight) and bugs/corner-cases (see eg. how taking the query norm into
account causes scoring challenges on LUCENE-7337).
> Since we made BM25 the default in 6.0, I propose that we remove these TF-IDF-specific
features in 7.0.



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