GitHub user liufengdb opened a pull request:
https://github.com/apache/spark/pull/20174
S[SPARK-22951][SQL] aggregate should not produce empty rows if data frame
is empty
## What changes were proposed in this pull request?
WIP
## How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liufengdb/spark fix-duplicate
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20174.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 #20174
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commit 89d6b7504239211cd64188be50ae32a199f1ddd8
Author: Feng Liu <fengliu@...>
Date: 2018-01-06T07:51:16Z
init
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