score:2
Accepted answer
create a map-reduce index and then query on it.
https://ravendb.net/docs/article-page/4.2/csharp/indexes/map-reduce-indexes
for example, in this example, you can query on 'category' field because it was indexed (meaning it was part of the map-reduce index definition)
see short demo examples in: https://demo.ravendb.net/
Source: stackoverflow.com
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