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https://issues.apache.org/jira/browse/SPARK-9458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin reopened SPARK-9458:
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> Avoid object allocation in prefix generation
> --------------------------------------------
>
> Key: SPARK-9458
> URL: https://issues.apache.org/jira/browse/SPARK-9458
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 1.5.0
>
>
> In our existing sort prefix generation code, we use expression's eval method
> to generate the prefix, which results in object allocation for every prefix.
> We can use the specialized getters available on InternalRow directly to avoid
> the object allocation.
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