Soubhik Chakraborty created HIVE-26514:
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Summary: 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
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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