Jesus Camacho Rodriguez created HIVE-13096:
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Summary: Cost to choose side table in MapJoin conversion based on
cumulative cardinality
Key: HIVE-13096
URL: https://issues.apache.org/jira/browse/HIVE-13096
Project: Hive
Issue Type: Bug
Components: Physical Optimizer
Affects Versions: 2.0.0, 2.1.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
HIVE-11954 changed the logic to choose the side table in the MapJoin conversion
algorithm. Initial heuristic for the cost was based on number of heavyweight
operators.
This extends that work so the heuristic is based on accumulate cardinality. In
the future, we should choose the side based on total latency for the input.
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