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https://issues.apache.org/jira/browse/HIVE-29250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-29250:
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Labels: pull-request-available (was: )
> Display effects of PlanModifierForASTConv in EXPLAIN CBO output
> ---------------------------------------------------------------
>
> Key: HIVE-29250
> URL: https://issues.apache.org/jira/browse/HIVE-29250
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Labels: pull-request-available
>
> The EXPLAIN CBO clause outputs the plan generated by the cost-based (Calcite)
> optimizer. Although it is not explicitly defined which state of the CBO plan
> should be displayed to the end-users someone would expect that it is the
> final plan after applying all kind of transformations that are relevant and
> can affect the shape of the physical plan.
> However, at the moment the transformations that happen inside
> PlanModifierForASTConv are not *always* reflected to the plan. These
> transformations are important cause they can affect the physical plan both in
> terms of correctness and performance. Some transformations from
> PlanModifierForASTConv are already visible mostly as a side-effect of
> modifying directly the object reference that is passed as input.
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