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https://issues.apache.org/jira/browse/LUCENE-1582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695016#action_12695016
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Michael McCandless commented on LUCENE-1582:
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This sounds like a great improvement!
> Make TrieRange completely independent from Document/Field with TokenStream of
> prefix encoded values
> ---------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1582
> URL: https://issues.apache.org/jira/browse/LUCENE-1582
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 2.9
>
>
> TrieRange has currently the following problem:
> - To add a field, that uses a trie encoding, you can manually add each term
> to the index or use a helper method from TrieUtils. The helper method has the
> problem, that it uses a fixed field configuration
> - TrieUtils currently creates per default a helper field containing the lower
> precision terms to enable sorting (limitation of one term/document for
> sorting)
> - trieCodeLong/Int() creates unnecessarily String[] and char[] arrays that is
> heavy for GC, if you index lot of numeric values. Also a lot of char[] to
> String copying is involved.
> This issue should improve this:
> - trieCodeLong/Int() returns a TokenStream. During encoding, all char[]
> arrays are reused by Token API, additional String[] arrays for the encoded
> result are not created, instead the TokenStream enumerates the trie values.
> - Trie fields can be added to Documents during indexing using the standard
> API: new Field(name,TokenStream,...), so no extra util method needed. By
> using token filters, one could also add payload and so and customize
> everything.
> The drawback is: Sorting would not work anymore. To enable sorting, a
> (sub-)issue can extend the FieldCache to stop iterating the terms, as soon as
> a lower precision one is enumerated by TermEnum. I will create a "hack" patch
> for TrieUtils-use only, that uses a non-checked Exceptionin the Parser to
> stop iteration. With LUCENE-831, a more generic API for this type can be used
> (custom parser/iterator implementation for FieldCache). I will attach the
> field cache patch (with the temporary solution, until FieldCache is
> reimplemented) as a separate patch file, or maybe open another issue for it.
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