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https://issues.apache.org/jira/browse/SOLR-2134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141484#comment-13141484
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Uwe Schindler commented on SOLR-2134:
-------------------------------------
The whole story is more complicated:
The sortMissingLast/First part in Lucene is different between 3.x and trunk
(4.0). The implementation in trunk is not good designed and is to be replaced
by the 3.x version, which needs heavy reverting :-)
The Lucene 3.x version supports sortmissinglast/first (since 3.4, using a new
API), but this was not yet ported to Solr. We want to first fix trunk to use
the better approach and will also revert the Solr implementation when we do
this. After that we have a clean start and can do: LUCENE-3443
> Trie* fields should support sortMissingLast=true, and deprecate Sortable*
> Field Types
> -------------------------------------------------------------------------------------
>
> Key: SOLR-2134
> URL: https://issues.apache.org/jira/browse/SOLR-2134
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Reporter: Ryan McKinley
> Attachments: SOLR-2134-SortMissingLast.patch,
> SOLR-2134-SortMissingLast.patch, SOLR-2134-SortMissingLast.patch,
> SOLR-2134-SortMissingLast.patch
>
>
> With the changes in LUCENE-2649, the FieldCache also returns if the bit is
> valid or not. This is enough to support sortMissingLast=true with Trie*
> fields. Then we can get rid of the Sortable* fields
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