GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/23219
[SPARK-26266][BUILD] Update to Scala 2.12.8
## What changes were proposed in this pull request?
This pr update to Scala 2.12.8. It fixes two regressions that appeared in
2.12.7:
```
Don't reject views with result types which are TypeVars (#7295)
Don't emit static forwarders (which simplify the use of methods in
top-level objects from Java) for bridge methods (#7469)
```
More details: https://github.com/scala/scala/releases/tag/v2.12.8
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-26266
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23219.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 #23219
commit 94f76e543c1b146d4d25d3e15b6efd4777af7652
Author: Yuming Wang
Date: 2018-12-04T15:03:26Z
Upgrade Scala to 2.12.8
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