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From benchmarks it seems that columnar storage shines when there isn't enough RAM avaliable. Lower cost full text search seems quite good value proposition.

And row-wise storage for lowest latency when cost is not a problem.

Also, I took a quick look at ranking. With things like BM25 and geo-spatial search it seems to be flexible and feature rich enough. I think it's time I take a serious look at Manticore.