GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/18570
[SPARK-21100][SQL][Followup] cleanup code and add more comments for
Dataset.summary
## What changes were proposed in this pull request?
Some code cleanup and adding comments to make the code more readable.
Changed the way to generate result rows, to be more clear.
## How was this patch tested?
existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark summary
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18570.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 #18570
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commit 3f2b41bbcde29c1016bcab401de515cf67b8f246
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2017-07-08T08:59:50Z
cleanup code and add more comments
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