Henry Robinson created SPARK-23634:
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Summary: 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: 2.4.0
Reporter: Henry Robinson
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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