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https://issues.apache.org/jira/browse/HIVE-9140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256029#comment-14256029
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Laljo John Pullokkaran commented on HIVE-9140:
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It seems like we should run constant propagation before join ordering in order
to influence costing decisions (especially this becomes relevant when we do
join algorithm selection based on I/O & cpu cost) and may be we need to run
this after as well to remove the true predicate.
> 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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