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https://issues.apache.org/jira/browse/HIVE-9140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250183#comment-14250183
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Ashutosh Chauhan commented on HIVE-9140:
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[~jpullokkaran] Can you take a look at this one? I initially thought its better
to have it in applyPreCBOTransformations() but than I realized that our join
ordering algorithm leaves {where true} predicates while optimizing tree. Since,
it will be good to remove such predicates, I have added these rules alongwith
join ordering rules. Let me know what do you think.
> Add ReduceExpressionRules from Calcite into Hive
> ------------------------------------------------
>
> Key: HIVE-9140
> URL: https://issues.apache.org/jira/browse/HIVE-9140
> Project: Hive
> Issue Type: Improvement
> Components: CBO, Logical Optimizer
> Affects Versions: 0.14.0
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-9140.patch
>
>
> These rules provide a form of constant folding.
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