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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (JIRA)" <ji...@apache.org> on 2016/03/24 04:28:25 UTC

[jira] [Closed] (SPARK-13903) Modify output nullability with constraints for Join and Filter operators

     [ https://issues.apache.org/jira/browse/SPARK-13903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liang-Chi Hsieh closed SPARK-13903.
-----------------------------------
    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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