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https://issues.apache.org/jira/browse/SPARK-16839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402920#comment-15402920
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Apache Spark commented on SPARK-16839:
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User 'eyalfa' has created a pull request for this issue:
https://github.com/apache/spark/pull/14444
> CleanupAliases may leave redundant aliases at end of analysis state
> -------------------------------------------------------------------
>
> Key: SPARK-16839
> URL: https://issues.apache.org/jira/browse/SPARK-16839
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.1, 2.0.0
> Reporter: Eyal Farago
> Priority: Minor
> Labels: alias, analysis, analyzers, sql, struct
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> [SPARK-9634] [SPARK-9323] [SQL] introduced CleanupReferences which removes
> unnecessary Aliases while keeping required ones such as top level Projection
> and struct attributes. this mechanism is implemented by maintaining a boolean
> flag during a top-down expression transformation, I found a case where this
> mechanism leaves redundant aliases in the tree (within a right sibling of a
> create_struct node).
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