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https://issues.apache.org/jira/browse/HIVE-10786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Laljo John Pullokkaran updated HIVE-10786:
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Summary: Propagate Histograms in Calcite/Physical Optimizer (was:
Propagate range for column stats)
> Propagate Histograms in Calcite/Physical Optimizer
> --------------------------------------------------
>
> Key: HIVE-10786
> URL: https://issues.apache.org/jira/browse/HIVE-10786
> Project: Hive
> Issue Type: Bug
> Reporter: Jesus Camacho Rodriguez
> Assignee: Pengcheng Xiong
>
> 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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