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https://issues.apache.org/jira/browse/LUCENE-584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12643495#action_12643495
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Wouter Heijke commented on LUCENE-584:
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We got the same error here on a 15Gb index with Lucene 2.4.0:
java.lang.ClassCastException: java.util.BitSet cannot be cast to
org.apache.lucene.search.DocIdSet
org.apache.lucene.search.CachingWrapperFilter.getDocIdSet(CachingWrapperFilter.java:76)
org.apache.lucene.misc.ChainedFilter.getDocIdSet(ChainedFilter.java:200)
org.apache.lucene.misc.ChainedFilter.getDocIdSet(ChainedFilter.java:145)
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:140)
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:112)
org.apache.lucene.search.Searcher.search(Searcher.java:136)
> Decouple Filter from BitSet
> ---------------------------
>
> Key: LUCENE-584
> URL: https://issues.apache.org/jira/browse/LUCENE-584
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.1
> Reporter: Peter Schäfer
> Assignee: Michael Busch
> Priority: Minor
> Fix For: 2.4
>
> Attachments: bench-diff.txt, bench-diff.txt, CHANGES.txt.patch,
> ContribQueries20080111.patch, lucene-584-take2.patch,
> lucene-584-take3-part1.patch, lucene-584-take3-part2.patch,
> lucene-584-take4-part1.patch, lucene-584-take4-part2.patch,
> lucene-584-take5-part1.patch, lucene-584-take5-part2.patch, lucene-584.patch,
> Matcher-20070905-2default.patch, Matcher-20070905-3core.patch,
> Matcher-20071122-1ground.patch, Some Matchers.zip, Test20080111.patch
>
>
> {code}
> package org.apache.lucene.search;
> public abstract class Filter implements java.io.Serializable
> {
> public abstract AbstractBitSet bits(IndexReader reader) throws IOException;
> }
> public interface AbstractBitSet
> {
> public boolean get(int index);
> }
> {code}
> It would be useful if the method =Filter.bits()= returned an abstract
> interface, instead of =java.util.BitSet=.
> Use case: there is a very large index, and, depending on the user's
> privileges, only a small portion of the index is actually visible.
> Sparsely populated =java.util.BitSet=s are not efficient and waste lots of
> memory. It would be desirable to have an alternative BitSet implementation
> with smaller memory footprint.
> Though it _is_ possibly to derive classes from =java.util.BitSet=, it was
> obviously not designed for that purpose.
> That's why I propose to use an interface instead. The default implementation
> could still delegate to =java.util.BitSet=.
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