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https://issues.apache.org/jira/browse/HIVE-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188469#comment-14188469
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Ashutosh Chauhan commented on HIVE-8435:
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[~jcamachorodriguez] First step here is to identify if patch resulted in any of
above listed queries to fail or was it just plan changes. You can run these
test with overwrite option and than on review board we can look to see if
things are looking good.
> Add identity project remover optimization
> -----------------------------------------
>
> Key: HIVE-8435
> URL: https://issues.apache.org/jira/browse/HIVE-8435
> Project: Hive
> Issue Type: New Feature
> Components: Logical Optimizer
> Affects Versions: 0.9.0, 0.10.0, 0.11.0, 0.12.0, 0.13.0
> Reporter: Ashutosh Chauhan
> Assignee: Sergey Shelukhin
> Attachments: HIVE-8435.02.patch, HIVE-8435.03.patch,
> HIVE-8435.03.patch, HIVE-8435.04.patch, HIVE-8435.05.patch,
> HIVE-8435.05.patch, HIVE-8435.1.patch, HIVE-8435.patch
>
>
> In some cases there is an identity project in plan which is useless. Better
> to optimize it away to avoid evaluating it without any benefit at runtime.
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