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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2671) Add sort missing first/last ability to SortField and ValueComparator
Date Mon, 27 Sep 2010 00:25:32 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915083#action_12915083
] 

Yonik Seeley commented on LUCENE-2671:
--------------------------------------

Ah - I was just about to report "hmmm, doesn't seem to be working".  But then I realized you
separated them out and this is the lucene part only.

IMO - if you're working on these together (and esp if the original motivation was to ultimately
get the functionallity into Solr, it's simpler to keep it as a single issue / single patch).

> 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
>         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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