GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/18416
[SPARK-21204][SQL][WIP] Add support for Scala Set collection types in
serialization
## What changes were proposed in this pull request?
Currently we can't produce a `Dataset` containing `Set` in SparkSQL.
There's no corresponding internal data type in SparkSQL for a `Set`. A
`Set` will be serialized to an array.
## How was this patch tested?
Added unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21204
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18416.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 #18416
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commit db1b91ed3fd0979841d40a20e7db0f64c62a947d
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-06-25T10:21:27Z
Add support for Scala Set collection types in serialization.
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