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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