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Posted to issues@spark.apache.org by "antonkulaga (JIRA)" <ji...@apache.org> on 2018/08/14 21:13:00 UTC
[jira] [Commented] (SPARK-16406) Reference resolution for large
number of columns should be faster
[ https://issues.apache.org/jira/browse/SPARK-16406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580444#comment-16580444 ]
antonkulaga commented on SPARK-16406:
-------------------------------------
Are you going to backport it to 2.3.2 as well?
> Reference resolution for large number of columns should be faster
> -----------------------------------------------------------------
>
> Key: SPARK-16406
> URL: https://issues.apache.org/jira/browse/SPARK-16406
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Herman van Hovell
> Assignee: Herman van Hovell
> Priority: Major
> Fix For: 2.4.0
>
>
> Resolving columns in a LogicalPlan on average takes n / 2 (n being the number of columns). This gets problematic as soon as you try to resolve a large number of columns (m) on a large table: O(m * n / 2)
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