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From "Paul Elschot (JIRA)" <>
Subject [jira] Commented: (LUCENE-1461) Cached filter for a single term field
Date Tue, 25 Nov 2008 13:39:44 GMT


Paul Elschot commented on LUCENE-1461:

{quote}Someday, I think RangeFilter and RangeQuery should be implemented using hierarchical
ranges (there was a reference to a page in the wiki, specifically about date range searching,
recently), which would be another method.{quote}

I think you're referring to the hierarchical prefixes here:
These hierarchical ranges require an analyzer to output all tokens "to the root" and a disjunction
filter on the terms corresponding to the levels in the range. At each level a RangeMultiFilter
could be used, but that would require a lot of memory. TermFilters would be better in that
case I think.

> Cached filter for a single term field
> -------------------------------------
>                 Key: LUCENE-1461
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>            Reporter: Tim Sturge
>         Attachments:, LUCENE-1461a.patch,,,
> These classes implement inexpensive range filtering over a field containing a single
term. They do this by building an integer array of term numbers (storing the term->number
mapping in a TreeMap) and then implementing a fast integer comparison based DocSetIdIterator.
> This code is currently being used to do age range filtering, but could also be used to
do other date filtering or in any application where there need to be multiple filters based
on the same single term field. I have an untested implementation of single term filtering
and have considered but not yet implemented term set filtering (useful for location based
searches) as well. 
> The code here is fairly rough; it works but lacks javadocs and toString() and hashCode()
methods etc. I'm posting it here to discover if there is other interest in this feature; I
don't mind fixing it up but would hate to go to the effort if it's not going to make it into

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