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https://issues.apache.org/jira/browse/LUCENE-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Toke Eskildsen resolved LUCENE-2369.
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Resolution: Won't Fix
I am closing this as I have not touched it for years and since it was probably
a bad idea to start with.
> Locale-based sort by field with low memory overhead
> ---------------------------------------------------
>
> Key: LUCENE-2369
> URL: https://issues.apache.org/jira/browse/LUCENE-2369
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/search
> Affects Versions: 4.0
> Reporter: Toke Eskildsen
> Priority: Minor
> Labels: memory, search, sort, time
> Attachments: LUCENE-2369.patch, LUCENE-2369.patch, LUCENE-2369.patch,
> LUCENE-2369.patch, LUCENE-2369.patch, lucene-2369-20101011.patch
>
>
> The current implementation of locale-based sort in Lucene uses the FieldCache
> which keeps all sort terms in memory. Beside the huge memory overhead,
> searching requires comparison of terms with collator.compare every time,
> making searches with millions of hits fairly expensive.
> This proposed alternative implementation is to create a packed list of
> pre-sorted ordinals for the sort terms and a map from document-IDs to entries
> in the sorted ordinals list. This results in very low memory overhead and
> faster sorted searches, at the cost of increased startup-time. As the
> ordinals can be resolved to terms after the sorting has been performed, this
> approach supports fillFields=true.
> This issue is related to https://issues.apache.org/jira/browse/LUCENE-2335
> which contain previous discussions on the subject.
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