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A comment on On Counting (2017).
As long as your S3 data is reasonably partitioned, and you don't have millions of small files, it does a reasonable job -even on count(distinct)
It even support approx_distinct for hyperloglog estimation too
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As long as your S3 data is reasonably partitioned, and you don't have millions of small files, it does a reasonable job -even on count(distinct)
It even support approx_distinct for hyperloglog estimation too