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https://issues.apache.org/jira/browse/SPARK-26312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713577#comment-16713577
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Apache Spark commented on SPARK-26312:
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User 'eatoncys' has created a pull request for this issue:
https://github.com/apache/spark/pull/23262
> Converting converters in RDDConversions into arrays to improve their access
> performance
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-26312
> URL: https://issues.apache.org/jira/browse/SPARK-26312
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: eaton
> Priority: Major
>
> `RDDConversions` would get disproportionately slower as the number of columns
> in the query increased.
> This PR converts the `converters` in `RDDConversions` into arrays to improve
> their access performance, the type of `converters` before is
> `scala.collection.immutable.::` which is a subtype of list.
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