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https://issues.apache.org/jira/browse/SPARK-19598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869623#comment-15869623
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Song Jun commented on SPARK-19598:
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Thanks~ let me investigate more~

> Remove the alias parameter in UnresolvedRelation
> ------------------------------------------------
>
>                 Key: SPARK-19598
>                 URL: https://issues.apache.org/jira/browse/SPARK-19598
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Reynold Xin
>
> UnresolvedRelation has a second argument named "alias", for assigning the 
> relation an alias. I think we can actually remove it and replace its use with 
> a SubqueryAlias.
> This would actually simplify some analyzer code to only match on 
> SubqueryAlias. For example, the broadcast hint pull request can have one 
> fewer case https://github.com/apache/spark/pull/16925/files.



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