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https://issues.apache.org/jira/browse/LUCENE-4076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christoph Kaser updated LUCENE-4076:
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Affects Version/s: 4.7.1
> When doing nested (index-time) joins, ToParentBlockJoinCollector delivers
> incomplete information on the grand-children
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4076
> URL: https://issues.apache.org/jira/browse/LUCENE-4076
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 3.4, 3.5, 3.6, 4.7.1
> Reporter: Christoph Kaser
>
> ToParentBlockJoinCollector.getTopGroups does not provide the correct answer
> when a query with nested ToParentBlockJoinCollectors is performed.
> Given the following example query:
> {code}
> Query grandChildQuery=new TermQuery(new Term("color", "red"));
> Filter childFilter = new CachingWrapperFilter(new RawTermFilter(new
> Term("type","child")), DeletesMode.IGNORE);
> ToParentBlockJoinQuery grandchildJoinQuery = new
> ToParentBlockJoinQuery(grandChildQuery, childFilter, ScoreMode.Max);
> BooleanQuery childQuery= new BooleanQuery();
> childQuery.add(grandchildJoinQuery, Occur.MUST);
> childQuery.add(new TermQuery(new Term("shape", "round")), Occur.MUST);
> Filter parentFilter = new CachingWrapperFilter(new RawTermFilter(new
> Term("type","parent")), DeletesMode.IGNORE);
> ToParentBlockJoinQuery childJoinQuery = new
> ToParentBlockJoinQuery(childQuery, parentFilter, ScoreMode.Max);
> parentQuery=new BooleanQuery();
> parentQuery.add(childJoinQuery, Occur.MUST);
> parentQuery.add(new TermQuery(new Term("name", "test")), Occur.MUST);
> ToParentBlockJoinCollector parentCollector= new
> ToParentBlockJoinCollector(Sort.RELEVANCE, 30, true, true);
> searcher.search(parentQuery, null, parentCollector);
> {code}
> This produces the correct results:
> {code}
> TopGroups<Integer> childGroups = parentCollector.getTopGroups(childJoinQuery,
> null, 0, 20, 0, false);
> {code}
> However, this does not:
> {code}
> TopGroups<Integer> grandChildGroups =
> parentCollector.getTopGroups(grandchildJoinQuery, null, 0, 20, 0, false);
> {code}
> The content of grandChildGroups is broken in the following ways:
> * The groupValue is not the document id of the child document (which is the
> parent of a grandchild document), but the document id of the _previous_
> matching parent document
> * There are only as much GroupDocs as there are parent documents (not child
> documents), and they only contain the children of the last child document
> (but, as mentioned before, with the wrong groupValue).
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