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Posted to issues@kudu.apache.org by "Thomas Tauber-Marshall (JIRA)" <ji...@apache.org> on 2017/09/28 21:36:00 UTC

[jira] [Created] (KUDU-2162) Expose stats about scan filters

Thomas Tauber-Marshall created KUDU-2162:
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             Summary: Expose stats about scan filters
                 Key: KUDU-2162
                 URL: https://issues.apache.org/jira/browse/KUDU-2162
             Project: Kudu
          Issue Type: Improvement
          Components: client
            Reporter: Thomas Tauber-Marshall


Impala is working on implementing runtime filters that get pushed down into Kudu using KuduScanner::AddConjunctPredicate()

It would be useful for perf analysis and debugging to be able to include info in Impala's runtime profile about the effectiveness of the filters, eg. number of rows that are filtered.

This would probably require at least two counters:
- # of blocks that are entirely skipped
- # of rows that are filtered from blocks that aren't entirely skipped



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