GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/8066
[SPARK-9778][SQL] remove unnecessary evaluation from SortOrder
If the order-by expression is already in child's output, we can just
reference it instead of evaluate it agian.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark order-by
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8066.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 #8066
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commit eaa60028d40d1b63c252d862c3dd123c12fee141
Author: Wenchen Fan <[email protected]>
Date: 2015-08-10T07:54:38Z
remove unnecessary evaluation from SortOrder
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