GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19570
[SPARK-22335][SQL] Clarify union behavior on Dataset of typed objects in
the document
## What changes were proposed in this pull request?
Seems that end users can be confused by the union's behavior on Dataset of
typed objects. We can clarity it more in the document of `union` function.
## How was this patch tested?
Only document change.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-22335
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19570.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 #19570
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commit eab627ae9860442597d6a038a19b6f63a10f23e4
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-10-25T02:55:52Z
Add notice into the document of `union` to clarity the usage for typed
object.
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