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Posted to issues@impala.apache.org by "Qifan Chen (Jira)" <ji...@apache.org> on 2021/02/09 16:41:00 UTC

[jira] [Created] (IMPALA-10495) Computing correlation coefficient for certain columns can be useful to min/max filters

Qifan Chen created IMPALA-10495:
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             Summary: Computing correlation coefficient for certain columns can be useful to min/max filters
                 Key: IMPALA-10495
                 URL: https://issues.apache.org/jira/browse/IMPALA-10495
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Qifan Chen


Selecting good min/max filters for a query during query compilation can be a difficult task as the benefit of such a filter may not known.  However, when a column C is known to have a strong correlation with a partition or a sort column, a min/max filter on C can be very useful.



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