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From: Michael McCandless <lucene@mikemccandless.com>
Date: Thu, 22 Mar 2012 11:02:27 -0400
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 <CAL8PwkbfPHB5G2ZRWQeJFgrcdNKhZ6LNn5gJsmKPSNa5w5obwQ@mail.gmail.com>
Subject: Re: BlockJoinQuery Clarification
To: java-user@lucene.apache.org, kiwi clive <kiwi_clive@yahoo.com>
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You have to replace all documents in the block (1 parent, 4 children
in your example) to update any of the documents... only updating the
child (or child + parent) will break the join...

There's also query-time joining coming in 3.6.0.

Mike McCandless

http://blog.mikemccandless.com

On Thu, Mar 22, 2012 at 10:50 AM, kiwi clive <kiwi_clive@yahoo.com> wrote:
> Hello
>
> I've been looking at the BlockJoinQuery in Lucene 3.4.0 and would like to=
 clarify my understanding.
>
> Suppose we have a parent document that we index with (say) 4 child docume=
nts. My understanding is that these go in as an atomic unit and allows us t=
o query and join across the documents.
>
> Now what say I wanted to update one of the child documents (only).=A0 If =
the child document was update with a standard update, I presume the join to=
 the parent is broken. If I update using a Collection, is it necessary to r=
eindex all of the documents (4 children + pareent).
>
> And finally, if I updated one child using a collection with the parent, w=
ould both of these documents require reindexing and loose their affinity wi=
th other children ?
>
> Thanks,
> C,

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