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From Michael Sokolov <>
Subject Re: including self-joins in parent/child queries
Date Tue, 16 Dec 2014 15:42:59 GMT
OK - I see looking at the code that an exception is thrown if a parent 
doc matches the subquery -- so that explains what will happen, but I 
guess my further question is -- is that necessary? Could we just not 
throw an exception there?


On 12/16/2014 10:38 AM, Michael Sokolov wrote:
> I see in the docs of ToParentBlockJoinQuery that:
>  * The child documents must be orthogonal to the parent
>  * documents: the wrapped child query must never
>  * return a parent document.
> First, it would be helpful if the docs explained what would happen if 
> that assumption were violated.
> Second, I want to do that!
> My parent documents have the same fields as their child documents 
> (title, text, etc): in some cases the best match for a query is the 
> entire book, (ie a query for "Java Programming"), in other cases it is 
> a specific chapter (a query for "Java regular expressions").
> Currently I am using Solr grouping queries to roll up parent and 
> child, but I am hoping to get a performance boost by using the 
> parent/child indexing which is a natural for us since we always index 
> a book at a time.
> If need be, I will simply index a child document that represents the 
> parent (ie duplicate the parent document but with a different type so 
> as to exclude it from the join subquery), but is this really 
> necessary? If so, can you explain why?
> Thanks
> -Mike

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