Anton Okolnychyi created SPARK-25860:
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Summary: 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
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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