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From Michael Sokolov <>
Subject including self-joins in parent/child queries
Date Tue, 16 Dec 2014 15:38:12 GMT
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?



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