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Considering RethinkDB's secondary indexes can be defined around pretty complex ReQL expressions [1] you could already get some of it already.

[1] http://rethinkdb.com/docs/pragmatic-faq/#how-do-i-take-advan...

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Yeah, I thought about that, but it seems like you can only use them to get the "map" part of map/reduce... no aggregation. Unless I'm missing something.

> Yeah, I thought about that, but it seems like you can only use them to get the "map" part of map/reduce... no aggregation. Unless I'm missing something.

I think that's correct.

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