[jira] [Commented] (LUCENE-5258) add distance function to expressions/

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[jira] [Commented] (LUCENE-5258) add distance function to expressions/

Nick Burch (Jira)

    [ https://issues.apache.org/jira/browse/LUCENE-5258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13789061#comment-13789061 ]

Ted Dunning commented on LUCENE-5258:

It occurs to me that you don't need the final inverse trig function if you only want to rank distances.

So if you want speed, peel that baby off.  Results for comparison at https://microbenchmarks.appspot.com/runs/43b5e3b9-5d1b-4a6c-9aaf-d4834c82523d

> add distance function to expressions/
> -------------------------------------
>                 Key: LUCENE-5258
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5258
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/other
>            Reporter: Robert Muir
>             Fix For: 5.0, 4.6
>         Attachments: LUCENE-5258.patch
> Adding this static function makes it really easy to incorporate distance with the score or other signals in arbitrary ways, e.g. score / (1 + log(distance)) or whatever.

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