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https://issues.apache.org/jira/browse/HIVE-26514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Soubhik Chakraborty reassigned HIVE-26514:
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> Use ItemSketches in Filter and Join selectivity estimates for Strings
> ---------------------------------------------------------------------
>
> Key: HIVE-26514
> URL: https://issues.apache.org/jira/browse/HIVE-26514
> Project: Hive
> Issue Type: Improvement
> Components: Hive, Logical Optimizer
> Reporter: Soubhik Chakraborty
> Assignee: Soubhik Chakraborty
> Priority: Major
>
> Introduce datasketches in the Filter and Join selectivity estimates. Right
> now {{FilterSelectivityEstimator uses NDVs as its best guess to estimate
> selectivity for String columns with Equality and IN predicates.}}
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