GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/19913
[SPARK-22720] [SS] Make EventTimeWatermark UnaryNode
## What changes were proposed in this pull request?
Our Analyzer and Optimizer has multiple rules for `UnaryNode`. After making
`EventTimeWatermark` extend `UnaryNode`, we do not need a special handling for
`EventTimeWatermark`.
## How was this patch tested?
The existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark eventtimewatermark
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19913.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 #19913
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commit 2ce27df7324c0763170cb492b7581863a314454d
Author: gatorsmile <[email protected]>
Date: 2017-12-06T18:00:11Z
fix
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