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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