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https://issues.apache.org/jira/browse/LUCENE-3600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-3600.
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Resolution: Fixed
> BlockJoinQuery advance fails on an assert in case of a single parent with
> child segment
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-3600
> URL: https://issues.apache.org/jira/browse/LUCENE-3600
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 3.5, 4.0
> Reporter: Shay Banon
> Assignee: Michael McCandless
> Fix For: 3.6, 4.0
>
>
> The BlockJoinQuery will fail on an assert when advance in called on a segment
> with a single parent with a child. The call to
> parentBits.prevSetBit(parentTarget - 1) will cause -1 to be returned, and the
> assert will fail, though its valid. Just removing the assert fixes the
> problem, since nextDoc will handle it properly.
> Also, I don't understand the "assert parentTarget != 0;", with a comment of
> each parent must have one child. There isn't really a reason to add this
> constraint, as far as I can tell..., just call nextDoc in this case, no?
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