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https://issues.apache.org/jira/browse/SPARK-22293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16207093#comment-16207093
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Apache Spark commented on SPARK-22293:
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User 'ConeyLiu' has created a pull request for this issue:
https://github.com/apache/spark/pull/19511
> Avoid unnecessary traversal in ResolveReferences
> ------------------------------------------------
>
> Key: SPARK-22293
> URL: https://issues.apache.org/jira/browse/SPARK-22293
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Xianyang Liu
>
> We don't need traverse the children expression to determine whether there is
> an `Star` when expand `Star` expression.
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