GitHub user JoshRosen opened a pull request:

    https://github.com/apache/spark/pull/13504

    [SPARK-15762][SQL] Cache Metadata.hashCode and use a singleton for 
Metadata.empty

    We should cache `Metadata.hashCode` and use a singleton for 
`Metadata.empty` because calculating metadata hashCodes appears to be a 
bottleneck for certain workloads. /cc @ericl 

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/JoshRosen/spark metadata-fix

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/13504.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #13504
    
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commit 806160072f0744f5e700f78d5632ea237fbc6515
Author: Josh Rosen <joshro...@databricks.com>
Date:   2016-06-03T21:05:26Z

    Cache metadata.

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