Jesus Camacho Rodriguez created HIVE-21006:
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Summary: Extend SharedWorkOptimizer to remove semijoins when there
is a reutilization opportunity
Key: HIVE-21006
URL: https://issues.apache.org/jira/browse/HIVE-21006
Project: Hive
Issue Type: Improvement
Components: Physical Optimizer
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Assume there are two TS operators in the plan over the same table, same
columns, same conditions, etc.
The first TS operator, TS1, has an incoming SJ edge. The second TS operator,
TS2, does not have any incoming SJ edge.
Since TS2 is reading the full table, we may just remove the SJ and TS1. Then we
will keep and share TS2, since it reads all the data in any case.
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