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From "Ning Li (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1470) Add TrieRangeFilter to contrib
Date Tue, 17 Feb 2009 15:56:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674248#action_12674248
] 

Ning Li commented on LUCENE-1470:
---------------------------------

Agree. Do you want to open a new issue? If you want, I can take a crack at it, but probably
sometime next week.

> Add TrieRangeFilter to contrib
> ------------------------------
>
>                 Key: LUCENE-1470
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1470
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/*
>    Affects Versions: 2.4
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 2.9
>
>         Attachments: fixbuild-LUCENE-1470.patch, fixbuild-LUCENE-1470.patch, LUCENE-1470-readme.patch,
LUCENE-1470-revamp.patch, LUCENE-1470-revamp.patch, LUCENE-1470-revamp.patch, LUCENE-1470.patch,
LUCENE-1470.patch, LUCENE-1470.patch, LUCENE-1470.patch, LUCENE-1470.patch, LUCENE-1470.patch,
LUCENE-1470.patch, trie.zip, TrieRangeFilter.java, TrieUtils.java, TrieUtils.java, TrieUtils.java,
TrieUtils.java, TrieUtils.java
>
>
> According to the thread in java-dev (http://www.gossamer-threads.com/lists/lucene/java-dev/67807
and http://www.gossamer-threads.com/lists/lucene/java-dev/67839), I want to include my fast
numerical range query implementation into lucene contrib-queries.
> I implemented (based on RangeFilter) another approach for faster
> RangeQueries, based on longs stored in index in a special format.
> The idea behind this is to store the longs in different precision in index
> and partition the query range in such a way, that the outer boundaries are
> search using terms from the highest precision, but the center of the search
> Range with lower precision. The implementation stores the longs in 8
> different precisions (using a class called TrieUtils). It also has support
> for Doubles, using the IEEE 754 floating-point "double format" bit layout
> with some bit mappings to make them binary sortable. The approach is used in
> rather big indexes, query times are even on low performance desktop
> computers <<100 ms (!) for very big ranges on indexes with 500000 docs.
> I called this RangeQuery variant and format "TrieRangeRange" query because
> the idea looks like the well-known Trie structures (but it is not identical
> to real tries, but algorithms are related to it).

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