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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/01/07 00:13:00 UTC

[jira] [Assigned] (SPARK-37832) Orc struct serializer should look up field converters in an array rather than a linked list

     [ https://issues.apache.org/jira/browse/SPARK-37832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-37832:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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