[jira] [Commented] (LUCENE-5092) join: don't expect all filters to be FixedBitSet instances

["Paul Elschot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902714#comment-13902714 ] 

Paul Elschot commented on LUCENE-5092:
--------------------------------------

As expected, after LUCENE-5440, the patch/pull request has a few conflicts. I'll resolve these.

> 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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