GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/17199
[SPARK-19859][SS]The new watermark should override the old one
## What changes were proposed in this pull request?
The new watermark should override the old one. Otherwise, we just pick up
the first column which has a watermark, it may be unexpected.
## How was this patch tested?
The new test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark SPARK-19859
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17199.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 #17199
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commit 6527cb1a3451f3e8183d031c40319fcd6ad3b7e1
Author: Shixiong Zhu <[email protected]>
Date: 2017-03-07T23:53:00Z
The new watermark should override the old one
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