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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-10786) Propagate range for column stats
Date Thu, 21 May 2015 16:09:17 GMT
Jesus Camacho Rodriguez created HIVE-10786:
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             Summary: Propagate range for column stats
                 Key: HIVE-10786
                 URL: https://issues.apache.org/jira/browse/HIVE-10786
             Project: Hive
          Issue Type: Bug
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


For column stats, Calcite doesn't propagate range. Range of a col will
help us in deciding filter cardinality for inequality.

Range of values of a column and NDV together will help us to get build histograms of uniform
height.

This needs special handling for each operator:
- Inner Join where col is part of join key: range is lowest range of lhs, rhs
- Outer Join: range of outer side if col is from outer side
- Filter inequality on literal ("x<10"): Range is restricted on upper side by
literal value



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