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https://issues.apache.org/jira/browse/SOLR-1334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739453#action_12739453
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Yonik Seeley commented on SOLR-1334:
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Yup - that's what I had in mind... a DocIdSet that matches documents with a
value.
> SortableXXXField could use native FieldCache for sorting
> --------------------------------------------------------
>
> Key: SOLR-1334
> URL: https://issues.apache.org/jira/browse/SOLR-1334
> Project: Solr
> Issue Type: Improvement
> Reporter: Uwe Schindler
>
> When looking through the FieldTypes (esp. new Trie code), I found out that
> field types using org.apache.solr.util.NumberUtils use String sorting. As
> SortField can get a FieldCache Parser since LUCENE-1478, NumberUtils could
> supply FieldCache.Parser singletons (serializable singletons!) for the
> SortableXXXField types, and the SortField instances could use these parsers
> instead of STRING only SortFields.
> The same parsers could be used to create ValueSources for these types.
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