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https://issues.apache.org/jira/browse/HIVE-16867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reassigned HIVE-16867:
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> 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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