Join and faceting by children's attributes

[Tobias <lo...@shoptimax.de>]

Hello,

I currently have a demand for faceting on the children of a join query.

My index is set up in a way that there are parent and child documents.
The child documents do have the facet information in a (precisely: some)
multivalue field(s). The parent documents themselves do not have any of it.

As the join query support allows me to do a simple search within the child
documents and return documents from the parent document space I thought
there
probably is a way to figure out the available facet values from the child
document space and present both in the result set, but this seems more
difficult
than I thought it would be.

The join query support would allow me to filter on specific
child-document-space
facet fields, for example:

but I can not really find a way to present *which faceting options are
available*
in the result set in first place.

Denormalizing my index in a way that the parent documents would contain
the faceting information is not an option at the moment, because I wanted
to keep the index more generic, so that there's not one field per attribute
but two generic attribute fields (multi-value), that keep the Key/Value
pairs,
like the following table shows. I need this setup because at index setup
time
I do not know which attributes for the various products/items will be
available.



If I now would denormalize a bunch of shoe child items into the parent
product
it would always contain all possible size/color combinations, even if some
of
the child products do not meet the initial search term's criteria, e.g.
searching above for (title:Sneakers AND desc:cool) should return just facets
for "size" (2), "color" (2), "red" (1), "blue" (1), "40" (1)  and "42" (1),
which I do postprocess in my client application, so that I know that
"red" and "blue" are "color"s and "40" and "42" are "size"s.

I thought that you cracks might have an idea on how to continue from there.

Best,
Tobias


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