GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/16886
[SPARK-19548][SQL] Support Hive UDFs which return typed Lists/Maps
## What changes were proposed in this pull request?
This PR adds support for Hive UDFs that return fully typed java Lists or
Maps, for example `List<String>` or `Map<String, Integer>`. It is also allowed
to nest these structures, for example `Map<String, List<Integer>>`. Raw
collections or collections using wildcards are still not supported, and cannot
be supported due to the lack of type information.
## How was this patch tested?
Modified existing tests in `HiveUDFSuite`, and I have added test cases for
raw collection and collection using wildcards.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-19548
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16886.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 #16886
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commit 56cdabdd0d19d6a07229202e939c8bd5beef4b12
Author: Herman van Hovell <[email protected]>
Date: 2017-02-10T11:21:02Z
Support Hive UDFs which return typed Lists/Maps
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