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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4426) New ValueSource implementations that wrap DocValues
Date Tue, 25 Sep 2012 17:54:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463038#comment-13463038
] 

Adrien Grand commented on LUCENE-4426:
--------------------------------------

bq. How does this relate to NumericIndexDocValueSource?

I didn't know about this class! Maybe the new classes of my patch could replace this one:
  * the objectVal method returns an object whose type matches the ValueSource name,
  * there is the StrDocValuesFieldSource to deal with DocValues.Type.BYTES* when they are
UTF8-encoded Strings
  * they use a default source when the segment has no DocValues
  * they give the ability to load direct sources

(My goal is to reuse them in SOLR-3855)

bq. I am confused why the current one only handles 3 types?

Right. Strange that it is able to deal with VAR_INTS but none of FIXED_INTS_*.
                
> New ValueSource implementations that wrap DocValues
> ---------------------------------------------------
>
>                 Key: LUCENE-4426
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4426
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: modules/other
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4426.patch
>
>
> We should have ValueSource implementations that wrap DocValues in lucene-queries so that
DocValues can be used in function queries.

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