[Katta-developer] [oss-101tec] Issue Comment Edited: (KATTA-226) Search score returns NaN instead of actual score of the result

[Johannes Z. (JIRA) <ji...@os...>]

    [ http://oss.101tec.com/jira/browse/KATTA-226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10713#action_10713 ] 

Johannes Zillmann edited comment on KATTA-226 at 4/9/13 1:23 PM:
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Hey Zuber, so i checked your case again. As soon as you are using a Sort, the scores will be unavailable.
It would be possible to get lucene to return the scores even if Sort is used (see [http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/core/org/apache/lucene/search/TopFieldCollector.html#create(org.apache.lucene.search.Sort, int, boolean, boolean, boolean, boolean)] , the 'trackDocScores' parameter, but that would require code changes to Katta (and has a performance impact as the javadoc states.

I could imagine to make the 'trackDocScores' parameter configurable in Katta. Just not sure about the best level. A global node property would be the easiest, but least flexible. On index-level would be half in-between. Query-level would be most flexible, but we would have to rethink the API...

Thoughts ?

      was (Author: jz):
    Hey Zuber, so i checked your case again. As soon as you are using a Sort, the scores will be unavailable.
It would be possible to get lucene to return the scores even if Sort is used (see http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/core/org/apache/lucene/search/TopFieldCollector.html#create(org.apache.lucene.search.Sort, int, boolean, boolean, boolean, boolean) , the 'trackDocScores' parameter, but that would require code changes to Katta (and has a performance impact as the javadoc states.

I could imagine to make the 'trackDocScores' parameter configurable in Katta. Just not sure about the best level. A global node property would be the easiest, but least flexible. On index-level would be half in-between. Query-level would be most flexible, but we would have to rethink the API...

Thoughts ?
  
> Search score returns NaN instead of actual score of the result
> --------------------------------------------------------------
>
>                 Key: KATTA-226
>                 URL: http://oss.101tec.com/jira/browse/KATTA-226
>             Project: Katta
>          Issue Type: Bug
>            Reporter: Zuber Bhatuk
>
> After making hits to katta, I could not find the score in the hit object( net.sf.katta.lib.lucene.Hit). The getScore() method of Hit object returns NaN. Any help will be highly appreciated.

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