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From: Darin Amos <darincs@gmail.com>
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Subject: Multivalu field grouping
Message-Id: <46A037BB-91F3-4ED5-B28B-F6A8554958B6@gmail.com>
Date: Wed, 4 Mar 2015 11:33:22 -0500
To: solr-user@lucene.apache.org
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Hi All,

I sent an email out earlier but I didn=E2=80=99t get any responses so I =
thought I would try to reframe the question.=20

I have a problem that I believe multivalued field grouping is the =
perfect answer for, of course since SOLR doesn=E2=80=99t support =
multivalued field grouping, I need to find an alternate approach. Or =
perhaps someone has found a way to do multivalue field grouping.


My client is an ecommerce firm and lets says they have a category page =
Where they want to show ALL shirts, but the results are grouped by a =
subcategory, tee-shirt, sweater, tec.... If he subcategory is a single =
value field this works fine, but a product document could belong to =
multiple categories. Perhaps there is a =E2=80=9CPopular=E2=80=9D or =
=E2=80=9CTrendy=E2=80=9D category that a production would also belong =
to.

My gut tells me this is a perfect fit for grouping on multi valued =
fields, and I can=E2=80=99t think of another way to solve this easily =
without finding a completely new way to index.

Thanks!

Darin

*PS: For example, I would want my results returned like the below =
(simplified):


All Shirts:
	- Trendy
		- Tee Shirt 1
		- Tee Shirt 2
		- Sweater 1
		- Sweater 2
	- Tee Shirts
		- Tee Shirt 1
		- Tee Shirt 2
		- Tee Shirt 3
		- Tee Shirt 4
	- Sweaters
		- Sweater 1
		- Sweater 2
		- Sweater 3
		- Sweater 4