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A comment on RethinkDB 1.12: simplified map/reduce, ARM port, new caching infrastructure. Parent comment

Re:RethinkDB 1.12: simplified map/reduce, ARM port, new cach... by coffeemug on Wednesday March 26, 2014 @08:23PM (#7477694)
In ReQL you can do it with group('category').ungroup().sample(3). It's really powerful once you get the hang of it.
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