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https://issues.apache.org/jira/browse/SOLR-2134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915816#action_12915816
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Uwe Schindler commented on SOLR-2134:
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I don't expect adding/subtracting anything to infinity changes its value (at
least the IEEE-754 specs say it should not change anything). NaN order is not
undefined but behaves different than you expect (it means if you ever compare
NaN with anything using <, >, == it will return always false). This will mix up
the sorting, so defining it as missingValue is maybe a good idea. But as said
before, you cannot compare with NaN, it will always return false, so use
Double.isNan(cached.values[doc]) :-)
> 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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