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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: More questions on BlockJoinQuery
Date Tue, 12 Feb 2013 10:56:19 GMT
Hi Chris,

Could you please send this to the java-user@lucene.apache.org list?
I'll try to answer it there ... this way future Googlers can benefit.

Mike McCandless

http://blog.mikemccandless.com

On Tue, Feb 12, 2013 at 2:03 AM, Chris Bamford
<chris.bamford@talktalk.net> wrote:
> Hi Mike,
>
> I have a question about your post "Searching relational content with Lucene's BlockJoinQuery"
> (http://blog.mikemccandless.com/2012/01/searching-relational-content-with.html).  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
I
> 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 td=s.search(q, 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.
>
> Thanks,
>
> - Chris
>
>
>
>

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