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https://issues.apache.org/jira/browse/LUCENE-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988492#action_12988492
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Yonik Seeley commented on LUCENE-2671:
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bq. Does this mean we should now deprecate: org.apache.solr.schema.Sortable*
Sure - I already removed references to those classes from the example schema.
> 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-caches.patch, LUCENE-2671-caches.patch,
> LUCENE-2671-SortMissingLast.patch, LUCENE-2671-suppress-unchecked.patch,
> LUCENE-2671.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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