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From Chris Bamford <>
Subject More questions on BlockJoinQuery
Date Tue, 12 Feb 2013 07:03:48 GMT
Hi Mike,

I have a question about your post "Searching relational content with Lucene's BlockJoinQuery"
(  I am 
actually trying to use Lucene 4.0.0, so am having to translate your example to the newer
ToParentBlockJoinQuery / ToChildBlockJoinQuery APIs.  I have had some success, but my
ultimate goal of combining the info from both child and parent hits is eluding me.  I 
suspect I am missing something, but as yet haven't figured out what!

In this scenario, let's say I have the following relationship:

child 1 :   ref:"100", content:"child 1", type:"C"
child 2 :   ref:"200", content:"child 2", type:"C"
child 3 :   ref:"300", content:"child 3", type:"C"
parent  :   ref:"400", content:"parent", type:"P"

When one or more children are hit, I want that to be noted against the parent, so ultimately
can create a result object like:

 Result{ ref:400, content:"parent", matches: [100, 300] }  // children 1 & 3 were hit

I have followed your example closely just replacing BlockJoinQuery with ToParentBlockJoinQuery
and BlockJoinCollector with ToParentBlockJoinCollector. 
Unfortunately I seem to be able to get either:

Just the parent objects (with, 10)) or just the children (with the Collector),

but not both!
Am I to call search() twice (one returning TopDocs and the other GroupDocs via the
Collector) and join them myself?  Or does one of these calls return me both types of
documents, grouped and sorted?

I hope this makes sense.  I'm happy to provide more detail if required.


- Chris

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