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https://issues.apache.org/jira/browse/SPARK-25379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-25379:
-----------------------------------

    Assignee: Marco Gaido

> Improve ColumnPruning performance
> ---------------------------------
>
>                 Key: SPARK-25379
>                 URL: https://issues.apache.org/jira/browse/SPARK-25379
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Optimizer, SQL
>    Affects Versions: 2.4.0
>            Reporter: Marco Gaido
>            Assignee: Marco Gaido
>            Priority: Major
>             Fix For: 2.5.0
>
>
> The {{--}} operation on {{AttributeSet}} is quite expensive, especially where 
> many columns are involved. {{ColumnPruning}} heavily relies on that operator 
> and this affects its running time. There are 2 optimization which are 
> possible:
>  - Improve {{--}} performance;
>  - Replace {{--}} with {{subsetOf}} when possible.
> Moreover, when building {{AttributeSet}} s we often do unneeded operations. 
> This also impacts other rules less significantly.
> I'll provide more details about the performance improvement achievable in the 
> PR.



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