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https://issues.apache.org/jira/browse/HIVE-26733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Solimando updated HIVE-26733:
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Summary: Not safe to use '=' for predicates on constant expressions that
might be NULL (was: HiveRelMdPredicates::getPredicate(Project) should return
IS_NULL for CAST(NULL))
> Not safe to use '=' for predicates on constant expressions that might be NULL
> -----------------------------------------------------------------------------
>
> Key: HIVE-26733
> URL: https://issues.apache.org/jira/browse/HIVE-26733
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 4.0.0-alpha-1
> Reporter: Alessandro Solimando
> Assignee: Alessandro Solimando
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Given a _CAST(NULL as $type)_ as i-th project expression, the method returns
> _(=($i, CAST(null:NULL):$type)_ instead of _IS_NULL($i)_ as in the case of a
> _NULL_ literal project expression.
> This is because _RexLiteral::isNullLiteral_ is used
> [here|https://github.com/apache/hive/blob/a6c0229f910972e84ba558e728532ffc245cc10d/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/stats/HiveRelMdPredicates.java#L153],
> while in similar cases, it's often convenient to use
> {_}RexUtil::isNullLiteral(RexNode, boolean allowCast){_}.
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