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https://issues.apache.org/jira/browse/LUCENE-1432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Elschot updated LUCENE-1432:
---------------------------------

    Attachment: LUCENE-1432.patch

This patch should fix the problem.

However, the implementation of the bits() method is so inefficient that it 
might actually motivate users to avoid it.

The patch also contains a docIdSetToCache() method with the Filter and the 
IndexReader as arguments, as discussed at LUCENE-1296.

> BitSet cannot be cast to DocIdSet
> ---------------------------------
>
>                 Key: LUCENE-1432
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1432
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 2.4
>            Reporter: Wouter Heijke
>         Attachments: LUCENE-1432.patch
>
>
> We recently upgraded from Lucene 2.3.1 to 2.4.0.
> We left the code as-is apart from the needed changes to the package name for 
> snowball, everything seems to run as before... Until yesterday when we 
> started noticing the following stacktrace:
> 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)
> Our index is 15gb in size and was made with Lucene 2.4.0.
> The index holds around 36 million (Lucene) documents and 268 million terms.

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