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https://issues.apache.org/jira/browse/SPARK-25892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670735#comment-16670735
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kevin yu commented on SPARK-25892:
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I am looking into this now. Kevin
> 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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