Ashutosh Chauhan created HIVE-15234:
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Summary: Semijoin cardinality estimation can be improved
Key: HIVE-15234
URL: https://issues.apache.org/jira/browse/HIVE-15234
Project: Hive
Issue Type: Bug
Components: CBO, Logical Optimizer
Affects Versions: 2.1.0, 2.0.0
Reporter: Ashutosh Chauhan
Assignee: Ashutosh Chauhan
Currently calcite optimization rules rely on (Hive)SemiJoin to represent semi
join node, whereas Stats estimate use {{leftSemiJoin}} field of Join to
estimate stats. As a result semi-join specific stats calculation logic is never
hit since at plan generation time HiveSemiJoin is created and leftSemiJoin
field of Join is never set.
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