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https://issues.apache.org/jira/browse/HIVE-20689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich reassigned HIVE-20689:
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> Simplifying using predicates should consider not equals in case its a
> predicate
> -------------------------------------------------------------------------------
>
> Key: HIVE-20689
> URL: https://issues.apache.org/jira/browse/HIVE-20689
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Right now simplifyUsingPredicates bails out for [all <>
> comparisions|https://github.com/apache/calcite/blob/c39bfaa02a06ac91575076a6e74f29863923f5eb/core/src/main/java/org/apache/calcite/rex/RexSimplify.java#L1050];
> however if it's already an explicit predicate (or its negated one); then it
> could be demoted to:
> {code}
> x IS NOT NULL or null
> {code}
> which could be further simplified in most cases..
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