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https://issues.apache.org/jira/browse/SPARK-15956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15330946#comment-15330946
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Apache Spark commented on SPARK-15956:
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User 'dafrista' has created a pull request for this issue:
https://github.com/apache/spark/pull/13676
> When unwrapping ORC avoid pattern matching at runtime
> -----------------------------------------------------
>
> Key: SPARK-15956
> URL: https://issues.apache.org/jira/browse/SPARK-15956
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Brian Cho
> Priority: Minor
>
> When unwrapping ORC values, pattern matching for each data value at runtime
> hurts performance. This should be avoided.
> Instead, we can run pattern matching once and return a function that is
> subsequently used to unwrap each data value. This is already implemented for
> certain primitive types. We should implement for the remaining types,
> including complex types (e.g, list, map).
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