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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1470) Add TrieRangeQuery to contrib
Date Sun, 08 Feb 2009 15:38:59 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yonik Seeley updated LUCENE-1470:
---------------------------------

    Attachment: TrieUtils.java

Uploading a new version of TrieUtils.

I've implemented my own range splitting logic (it will be interesting to see how it compares
to yours, and if mine actually works!  so many edge cases...)

It separates the range splitting logic from the execution of anything, so we can use the same
logic to generate queries that match the same range (no building an OpenBitSet first), or
other things like printable queries for debugging.

After reflection, the RangeBuilder interface could be simplified to just have a single addRange()
method... with the implicit assumption that all ranges are ORd together.

> Add TrieRangeQuery 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.patch, LUCENE-1470.patch, LUCENE-1470.patch, LUCENE-1470.patch, LUCENE-1470.patch,
LUCENE-1470.patch, LUCENE-1470.patch, 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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