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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2020/03/16 22:54:10 UTC
[jira] [Updated] (SPARK-23634) AttributeReferences may be too
conservative wrt nullability after optimization
[ https://issues.apache.org/jira/browse/SPARK-23634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjoon Hyun updated SPARK-23634:
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Affects Version/s: (was: 3.0.0)
3.1.0
> AttributeReferences may be too conservative wrt nullability after optimization
> ------------------------------------------------------------------------------
>
> Key: SPARK-23634
> URL: https://issues.apache.org/jira/browse/SPARK-23634
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Henry Robinson
> Priority: Minor
>
> An {{AttributeReference}} effectively caches the nullability of its referent when it is created. Some optimization rules can transform a nullable attribute into a non-nullable one, but the references to it are not updated.
> We could add a transformation rule that visits every {{AttributeReference}} and fixes its nullability after optimization.
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