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From Jeszy <jes...@gmail.com>
Subject Re: Any plans for approximate topN query?
Date Tue, 28 Nov 2017 14:19:28 GMT
Hello Jason,

IMPALA-5300 (https://issues.apache.org/jira/browse/IMPALA-5300) is in
the works, and I think it fits your use case. Can you take a look?

Thanks!

On 28 November 2017 at 15:11, Jason Heo <jason.heo.sde@gmail.com> wrote:
> 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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