GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/15596
[SQL] Remove shuffle codes in CollectLimitExec
## What changes were proposed in this pull request?
`CollectLimitExec` now shuffles its child's data in `doExecute`. As we have
`EnsureRequirements` to make shuffling between operators, it is better to let
`EnsureRequirements` does its job for `CollectLimitExec`, instead of shuffling
data itself in `CollectLimitExec`.
## How was this patch tested?
Jenkins tests.
Please review
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark before
opening a pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 refactor-collectlimit
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15596.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 #15596
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commit 3d24f79f2cb46b3cea80aa7c9b37d5e9653c95f1
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2016-10-21T23:25:46Z
Remove shuffle codes in CollectLimitExec.
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