GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/22728
[SPARK-25736][SQL][TEST] add tests to verify the behavior of multi-column
count
## What changes were proposed in this pull request?
AFAIK multi-column count is not widely supported by the mainstream
databases(postgres doesn't support), and the SQL standard doesn't define it
clearly, as near as I can tell.
Since Spark supports it, we should clearly document the current behavior
and add tests to verify it.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark doc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22728.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 #22728
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commit 62b4b84f135c2f71ecc8192deabec3d694b6bbc9
Author: Wenchen Fan <wenchen@...>
Date: 2018-10-15T15:25:14Z
add tests to verify the behavior of count for corner cases
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