GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/20861
[SPARK-23599][SQL] Use RandomUUIDGenerator in Uuid expression
## What changes were proposed in this pull request?
As stated in Jira, there are problems with current `Uuid` expression which
uses `java.util.UUID.randomUUID` for UUID generation.
This patch uses the newly added `RandomUUIDGenerator` for UUID generation.
So we can make `Uuid` deterministic between retries.
## 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-23599-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20861.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 #20861
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commit 306dbe8e26f2045b0d133e07455dedae058c0311
Author: Liang-Chi Hsieh <viirya@...>
Date: 2018-03-20T03:11:33Z
Use new UUID generator in Uuid expression.
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