Mikhail Khludnev commented on LUCENE-4968:

[~mikemccand], I suppose reporting scorer's class and docnum is not really 
helpul for users. What do you think about replacing it to meaningful advise to 
check parent and child filter for empty intersection?      

> Several ToParentBlockJoinQuery/Collector issues
> -----------------------------------------------
>                 Key: LUCENE-4968
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4968
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/join
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.3.1, 6.0
>         Attachments: LUCENE-4968.patch
> I hit several issues with ToParentBlockJoinQuery/Collector:
>   * If a given Query sometimes has no child matches then we could hit
>     AIOOBE, but should just get 0 children for that parent
>   * TPBJC.getTopGroups incorrectly throws IllegalArgumentException
>     when the child query happens to have no matches
>   * We have checks that user didn't accidentally pass a child query
>     that matches parent docs ... they are only assertions today but I
>     think they should be real checks since it's easy to screw up

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