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From "Ryan McKinley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-2671) Add sort missing first/last ability to SortField and ValueComparator
Date Wed, 29 Sep 2010 04:18:32 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan McKinley resolved LUCENE-2671.
-----------------------------------

    Fix Version/s: 4.0
       Resolution: Fixed

added in #1002460 -- this can be backported to 3.x when LUCENE-2665 is stabalized

> Add sort missing first/last ability to SortField and ValueComparator
> --------------------------------------------------------------------
>
>                 Key: LUCENE-2671
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2671
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>            Reporter: Ryan McKinley
>            Assignee: Ryan McKinley
>             Fix For: 4.0
>
>         Attachments: LUCENE-2671-SortMissingLast.patch
>
>
> When SortField and ValueComparator use EntryCreators (from LUCENE-2649) they use a special
sort value when the field is missing.
> This enables lucene to implement 'sort missing last' or 'sort missing first' for numeric
values from the FieldCache.

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