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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1582) Make TrieRange completely independent from Document/Field with TokenStream of prefix encoded values
Date Thu, 02 Apr 2009 14:19:13 GMT


Michael McCandless commented on LUCENE-1582:

This sounds like a great improvement!

> Make TrieRange completely independent from Document/Field with TokenStream of prefix
encoded values
> ---------------------------------------------------------------------------------------------------
>                 Key: LUCENE-1582
>                 URL:
>             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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