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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