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https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876136#comment-13876136
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Mikhail Khludnev commented on LUCENE-5092:
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It seems great!

> join: don't expect all filters to be FixedBitSet instances
> ----------------------------------------------------------
>
>                 Key: LUCENE-5092
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5092
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/join
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-5092.patch
>
>
> The join module throws exceptions when the parents filter isn't a 
> FixedBitSet. The reason is that the join module relies on prevSetBit to find 
> the first child document given a parent ID.
> As suggested by Uwe and Paul Elschot on LUCENE-5081, we could fix it by 
> exposing methods in the iterators to iterate backwards. When the join modules 
> gets an iterator which isn't able to iterate backwards, it would just need to 
> dump its content into another DocIdSet that supports backward iteration, 
> FixedBitSet for example.



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