GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/23131
[SPARK-25908][SQL][FOLLOW-UP] Add back unionAll
## What changes were proposed in this pull request?
This PR is to add back `unionAll`, which is widely used. The name is also
consistent with our ANSI SQL. We also have the corresponding `IntersectAll` and
`exceptAll`, which were introduced in Spark 2.4.
## How was this patch tested?
Added a test case in DataFrameSuite
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark addBackUnionAll
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23131.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 #23131
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commit 133246d973eb516ebc12ba5bb49cd30ba4f108f9
Author: gatorsmile <gatorsmile@...>
Date: 2018-11-24T20:04:52Z
Add back unionAll
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