[jira] [Assigned] (SPARK-14939) Eliminate No-op Alias SortOrder in Sort

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-14939:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>
> 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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