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https://issues.apache.org/jira/browse/LUCENE-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671630#action_12671630
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Yonik Seeley commented on LUCENE-1470:
--------------------------------------
I *think* the range splitting code I wrote is generic enough to also
automatically handle 32 bits too.
I think it's just a matter of starting with a different shift?
So for longs we have:
{code}
public static Object buildRange(RangeBuilder builder, long ll, long uu, int
precisionStep) {
// figure out where to start shift at
int shift = ((64-1)/precisionStep) * precisionStep;
return buildRange(builder, ll, uu, shift, precisionStep);
}
{code}
And for ints, it would simply (hopefully) be:
{code}
public static Object buildRange(RangeBuilder builder, int ll, int uu, int
precisionStep) {
// figure out where to start shift at
int shift = ((32-1)/precisionStep) * precisionStep;
return buildRange(builder, (long)ll, (long)uu, shift, precisionStep);
}
{code}
Does that sound right?
> 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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