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From Jason Heo <jason.heo....@gmail.com>
Subject Any plans for approximate topN query?
Date Tue, 28 Nov 2017 14:11:29 GMT
Hi,

I'm wondering impala team has any plans for approximate topN for single
dimension.

My Web analytic system mostly serves top n urls. Such a "GROUP BY url ORDER
BY pageview LIMIT n" is slow especially for high-cardinality field.
Approximate topN can be used instead of GroupBy for single dimension with
extremely lower latency.

Elastisearch, Druid, and Clickhouse already provide this feature.

It would be great if I can use it on Druid.

Thanks.

Regards,

Jason

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