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Posted to issues@spark.apache.org by "Marco Gaido (JIRA)" <ji...@apache.org> on 2018/09/08 09:06:00 UTC
[jira] [Updated] (SPARK-25379) Improve ColumnPruning performance
[ https://issues.apache.org/jira/browse/SPARK-25379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Marco Gaido updated SPARK-25379:
--------------------------------
Description:
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.
was:
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.
> 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
> Priority: Major
>
> 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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