GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/19406
[SPARK-22179] percentile_approx should choose the first element for small
percentage
## What changes were proposed in this pull request?
percentile_approx should choose the first element for small percentage
## How was this patch tested?
Added a new test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark minor_improve_percentile_approx
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19406.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 #19406
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commit 24f8295498a7ad6d2d99ea27a196ccf154165907
Author: Zhenhua Wang <wzh_...@163.com>
Date: 2017-09-30T16:04:32Z
return the first element for small percentage
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