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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 resolved SPARK-25379.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.5.0
Issue resolved by pull request 22364
[https://github.com/apache/spark/pull/22364]
> 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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