GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/8747
[SPARK-10585][SQL] only copy data once when generate unsafe projection
This PR is a completely rewritten of GenerateUnsafeProjection, to
accomplish the goal of copying data only once. The old code of
GenerateUnsafeProjection is still there to reduce review difficulty.
Instead of creating unsafe conversion code for struct, array and map, we
create code of writing the content to the global row buffer.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark copy-once
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8747.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 #8747
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commit d78671fa6bd2dc431bbf93b8c445431585b5db9e
Author: Wenchen Fan <cloud0...@outlook.com>
Date: 2015-09-14T07:57:00Z
only copy data once when generate unsafe projection
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