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https://issues.apache.org/jira/browse/LUCENE-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916009#action_12916009
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Ryan McKinley commented on LUCENE-2671:
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Note, this solution does not (yet) address Uwe's concern about sorting NaN and
real POSITIVE_INFINITY/NEGATIVE_INFINITY values.
I'm going to punt that to a different issues since it preexisted this one
> 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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