GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/12626
[SPARK-14863] Cache TreeNode's hashCode by default
Caching TreeNode's `hashCode` can lead to orders-of-magnitude performance
improvement in certain optimizer rules when operating on huge/complex schemas.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark cache-treenode-hashcode
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12626.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 #12626
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commit fc75c4d00192ae28db2d92865aaa73394c1d538f
Author: Josh Rosen <[email protected]>
Date: 2016-03-04T00:05:02Z
Cache TreeNode's hashCode by default.
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