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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