[jira] [Assigned] (SPARK-25860) Replace Literal(null, _) with FalseLiteral whenever possible

["Xiao Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li reassigned SPARK-25860:
-------------------------------

    Assignee: Anton Okolnychyi

> 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
>            Assignee: 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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