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https://issues.apache.org/jira/browse/LUCENE-1461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653408#action_12653408
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Tim Sturge commented on LUCENE-1461:
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That's amazing. LUCENE-855 (the FieldCacheRangeFilter part) is pretty much
identical in purpose and design, down to the name. The major implementation
differences are that it overloaded BitSet which was necessary prior to the
addition of DocIdSetIterator. Thus my implementation looks significantly
cleaner even though it is basically functionally identical.
I think this shows that any decent idea will be repeatedly reinvented until it
is widely enough known. I personally would have saved some time both in
conceptualization and implementation had I been aware of this.
I would very much like to credit Matt in CHANGES.txt for this as well; it seems
like an accident of fate that I'm not using his implementation today.
> Cached filter for a single term field
> -------------------------------------
>
> Key: LUCENE-1461
> URL: https://issues.apache.org/jira/browse/LUCENE-1461
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Tim Sturge
> Assignee: Michael McCandless
> Fix For: 2.9
>
> Attachments: DisjointMultiFilter.java, FieldCacheRangeFilter.patch,
> LUCENE-1461.patch, LUCENE-1461a.patch, LUCENE-1461b.patch,
> LUCENE-1461c.patch, RangeMultiFilter.java, RangeMultiFilter.java,
> TermMultiFilter.java, TestFieldCacheRangeFilter.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 Lucene.
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