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

["Mikhail Khludnev (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736388#comment-13736388 ] 

Mikhail Khludnev commented on LUCENE-5092:
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bq.  In my opinion the order of child / parent documents should be reversed, so the search for the parent (or child dont know) could go forward only.

[~thetaphi] in this case, after I advance()/nextDoc() a child scorer, how the parent scorer can reach the parent doc which is before of the matched child?
                
> 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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