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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1582) Make TrieRange completely independent from Document/Field with TokenStream of prefix encoded values
Date Thu, 02 Apr 2009 12:06:13 GMT
Make TrieRange completely independent from Document/Field with TokenStream of prefix encoded
values
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                 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 arrays of 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.
- Documents 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, util FieldCache is reimplemented) as a separate
patch file, or maybe open another issue for it.

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