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Yeah, wow.

"Join not supported Subselects not supported 'group by' not supported"

At that point you might as well be using MongoDB or what have you.

Well, support cross sharding `join`, `subslect` and `group by` is not easy, I see Vitess does not fully support them now.

I am the only guy to develop Mixer just for fun with little time, and have to improve it step by step. Any help is welcome.

Btw, I have not used MongoDB, I will try to see it later.