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https://issues.apache.org/jira/browse/SPARK-13903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang-Chi Hsieh closed SPARK-13903.
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Resolution: Won't Fix
> Modify output nullability with constraints for Join and Filter operators
> ------------------------------------------------------------------------
>
> Key: SPARK-13903
> URL: https://issues.apache.org/jira/browse/SPARK-13903
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> With constraints and optimization, we can make sure some outputs of a Join
> (or Filter) operator are not nulls. We should modify output nullability
> accordingly. We can use this information in later execution to avoid null
> checking.
> Another reason to modify plan output is that we will use the output to
> determine schema. We should keep correct nullability in the schema.
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