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Apache Spark commented on SPARK-25892:
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User 'kevinyu98' has created a pull request for this issue:
https://github.com/apache/spark/pull/22918
> AttributeReference.withMetadata method should have return type AttributeReference
> ---------------------------------------------------------------------------------
>
> Key: SPARK-25892
> URL: https://issues.apache.org/jira/browse/SPARK-25892
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Jari Kujansuu
> Priority: Trivial
>
> AttributeReference.withMetadata method should have return type AttributeReference instead
of Attribute.
> AttributeReference overrides withMetadata method defined in Attribute super class and
returns AttributeReference instance but method's return type is Attribute unlike in other
with... methods overridden by AttributeReference.
> In some cases you have to cast the return value back to AttributeReference.
> For example if you want to modify metadata for AttributeReference in LogicalRelation
you have to cast return value of withMetadata back to AttributeReference because LogicalRelation
takes Seq[AttributeReference] as argument.
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