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https://issues.apache.org/jira/browse/LUCENE-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007414#comment-15007414
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Mikhail Khludnev commented on LUCENE-5375:
------------------------------------------
{code}
Caused by: java.lang.IllegalStateException: child query must only match
non-parent docs, but parent docID=21474 matched childScorer=class
org.apache.lucene.search.TermScorer
{code}
I'd like to raise an issue to improve the message. I suppose we need to put
children and parent filter _queries_ into text to let users check the document
in the intersection.
> ToChildBlockJoinQuery becomes crazy on wrong subquery
> -----------------------------------------------------
>
> Key: LUCENE-5375
> URL: https://issues.apache.org/jira/browse/LUCENE-5375
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 4.6
> Reporter: Dr Oleg Savrasov
> Labels: patch
> Fix For: 4.6.1, Trunk
>
> Attachments: SOLR-5553-1.patch,
> SOLR-5553-insufficient_assertions.patch, SOLR-5553.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> If user supplies wrong subquery to ToParentBlockJoinQuery it reasonably
> throws IllegalStateException.
> (http://lucene.apache.org/core/4_0_0/join/org/apache/lucene/search/join/ToParentBlockJoinQuery.html
> 'The child documents must be orthogonal to the parent documents: the wrapped
> child query must never return a parent document.'). However
> ToChildBlockJoinQuery just goes crazy silently. I want to provide simple
> patch for ToChildBlockJoinQuery with if-throw clause and test.
> See
> http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201311.mbox/%3cf415ce3a-ebe5-4d15-adf1-c5ead32a1...@sheffield.ac.uk%3E
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