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https://issues.apache.org/jira/browse/HIVE-17378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16174438#comment-16174438
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Zoltan Haindrich commented on HIVE-17378:
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[~ashutoshc] Could you please take a look?
> CBO: HiveReduceExpressionsWithStatsRule can operate on IS_NULL and IS_NOT_NULL
> ------------------------------------------------------------------------------
>
> Key: HIVE-17378
> URL: https://issues.apache.org/jira/browse/HIVE-17378
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 3.0.0
> Reporter: Gopal V
> Assignee: Zoltan Haindrich
> Attachments: HIVE-17378.01.patch
>
>
> {code}
> * Currently we support the simplification of =, >=, <=, >, <, and
> * IN operations.
> */
> {code}
> IS_NULL and IS_NOT_NULL are closely related and can be processed by this rule.
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