GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/23135
[SPARK-26168] Update the code comments in Expression and Aggregate
## What changes were proposed in this pull request?
This PR is to improve the code comments to document some common traits and
traps about the expression.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark addcomments
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23135.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 #23135
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commit a6e725641f86309638dc1daf82d8e5e592df1fed
Author: gatorsmile <gatorsmile@...>
Date: 2018-11-25T20:44:23Z
fix
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