Jesus Camacho Rodriguez created HIVE-16867:
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Summary: Extend shared scan optimizer to reuse computation from
other operators
Key: HIVE-16867
URL: https://issues.apache.org/jira/browse/HIVE-16867
Project: Hive
Issue Type: Improvement
Components: Physical Optimizer
Affects Versions: 3.0.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Follow-up of the work in HIVE-16602.
HIVE-16602 introduced an optimization that identifies scans on input tables
that can be merged so the data is read only once.
This extension to that rule allows to reuse the computation that is done in the
work containing those scans. In particular, we traverse both parts of the plan
upstream and reuse the operators if possible.
Currently, the optimizer will not go beyond the output edge(s) of that work.
Follow-up extensions might remove this limitation.
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