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https://issues.apache.org/jira/browse/SPARK-37832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470258#comment-17470258
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Apache Spark commented on SPARK-37832:
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User 'bersprockets' has created a pull request for this issue:
https://github.com/apache/spark/pull/35120
> Orc struct serializer should look up field converters in an array rather than
> a linked list
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-37832
> URL: https://issues.apache.org/jira/browse/SPARK-37832
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Bruce Robbins
> Priority: Major
>
> The OrcSerializer's struct converter uses an index to look up a field
> converter in a linked list, resulting in a n*(n/2) average complexity per row
> (where n is the field count).
> Simply converting the linked list to an array brings performance gains,
> especially for wide structs.
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