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https://issues.apache.org/jira/browse/SPARK-15762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315067#comment-15315067
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Apache Spark commented on SPARK-15762:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/13504
> Cache Metadata.hashCode and use a singleton for Metadata.empty
> --------------------------------------------------------------
>
> Key: SPARK-15762
> URL: https://issues.apache.org/jira/browse/SPARK-15762
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> In Spark SQL we should cache Metadata.hashCode and use a singleton for
> Metadata.empty since calculating empty metadata hashCodes appears to be an
> bottleneck according to certain profiler results.
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