You do have to call getTopGroups for each grandchild query, and the order should match the TopGroups you got for the children
However .... looking at the code, I suspect there's a bug... by the time the collector collects the parent hit, some of the grand children will have been discarded. I suspect you'll only get back grandchildren for the last child docID under each parent docID's group. Are you seeing that? Tricky... can you open an issue? Mike McCandless http://blog.mikemccandless.com On Wed, May 23, 2012 at 12:22 PM, Christoph Kaser <lucene_l...@iconparc.de> wrote: > Hello, > > I would like to use the ToParentBlockJoinQuery and its collector to query a > document with children and grand children, but I can't figure out how to get > the document ids that represent grand children. > > I know how to build the query and get the parent and child documents: > > > /****Example code start*****/ > 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); > TopGroups<Integer> topGroups = parentCollector.getTopGroups(childJoinQuery, > null, 0, 20, 0, false); > > /****Example code end*****/ > > Now topGroups contains the parents document ids, and the child document ids. > But how can I get the grandchild document ids for a given child document id? > Do I have to call > > TopGroups<Integer> childTopGroups = > parentCollector.getTopGroups(grandchildJoinQuery , null, 0, 20, 0, false); > > and match the document ids by hand? If so, is there a guarantee that they > will be in the same order as I get them in the topgroups, or will I have to > iterate over all childTopGroups until I find the right document id? > > Does anyone have example code for nested joins? > > Thanks in advance, > Christoph > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
