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https://issues.apache.org/jira/browse/SPARK-25860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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DB Tsai resolved SPARK-25860.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 22857
[https://github.com/apache/spark/pull/22857]
> Replace Literal(null, _) with FalseLiteral whenever possible
> ------------------------------------------------------------
>
> Key: SPARK-25860
> URL: https://issues.apache.org/jira/browse/SPARK-25860
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer, SQL
> Affects Versions: 3.0.0
> Reporter: Anton Okolnychyi
> Priority: Major
> Fix For: 3.0.0
>
>
> We should have a new optimization rule that replaces {{Literal(null, _)}}
> with {{FalseLiteral}} in conditions in {{Join}} and {{Filter}}, predicates in
> {{If}}, conditions in {{CaseWhen}}.
> The underlying idea is that those expressions evaluate to {{false}} if the
> underlying expression is {{null}} (as an example see
> {{GeneratePredicate$create}} or {{doGenCode}} and {{eval}} methods in {{If}}
> and {{CaseWhen}}). Therefore, we can replace {{Literal(null, _)}} with
> {{FalseLiteral}}, which can lead to more optimizations later on.
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