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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2010/10/01 22:23:32 UTC

[jira] Commented: (LUCENE-2671) Add sort missing first/last ability to SortField and ValueComparator

    [ https://issues.apache.org/jira/browse/LUCENE-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917023#action_12917023 ] 

Uwe Schindler commented on LUCENE-2671:
---------------------------------------

Additionally, the source code formatting is not Lucene-conform (should be no newline before {, no extra space around method parameters).

> 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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