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From Alex Nastetsky <anastet...@spryinc.com>
Subject custom table/column statistics
Date Mon, 09 Jun 2014 01:33:06 GMT
Table statistics collection was added in HIVE-33 (numRows, rawDataSize,
etc). Is there anything that lets you create your own statistics gathering?

For example, given table A with columns x, y, z, I want to gather
count(distinct x, y) as a statistic that would be stored in the metastore.

I know there exist column level statistics that have approximations for
distinct for a single column, but that doesn't help my use case above where
I have 2 columns involved.

Thanks,
Alex.

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