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https://issues.apache.org/jira/browse/SPARK-14939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259165#comment-15259165
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Apache Spark commented on SPARK-14939:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/12719
> Eliminate No-op Alias SortOrder in Sort
> ---------------------------------------
>
> Key: SPARK-14939
> URL: https://issues.apache.org/jira/browse/SPARK-14939
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Dongjoon Hyun
>
> This issue aims to delete No-op **Alias** SortOrders in Sort. Currently,
> `EliminateSorts` removes direct foldable expressions, but cannot handle
> aliases.
> **Before**
> {code}
> scala> sql("select a, year(current_date()) as y from (select
> explode(array(1,2)) a) order by y").explain()
> == Physical Plan ==
> WholeStageCodegen
> : +- Sort [y#8 ASC], true, 0
> : +- INPUT
> +- Exchange rangepartitioning(y#8 ASC, 200), None
> +- WholeStageCodegen
> : +- Project [a#13,2016 AS y#8]
> : +- INPUT
> +- Generate explode([1,2]), false, false, [a#13]
> +- Scan OneRowRelation[]
> {code}
> **After**
> {code}
> scala> sql("select a, year(current_date()) as y from (select
> explode(array(1,2)) a) order by y").explain()
> == Physical Plan ==
> WholeStageCodegen
> : +- Project [a#13,2016 AS y#8]
> : +- INPUT
> +- Generate explode([1,2]), false, false, [a#13]
> +- Scan OneRowRelation[]
> {code}
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