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https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737357#comment-13737357
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Mikhail Khludnev commented on LUCENE-5092:
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bq. or add additional metadata to the documents in the block so we make it
easier to go from childs to parent and vice versa.
[~thetaphi] (I don't know how but) we can write single byte DocValues per child
document with delta to their parent (let's limit block size by 0xff), delta to
the previous parent for parent documents. WDYT?
> 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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