Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/22600
2.12.8 is out. Do we need to upgrade to 2.12.8?
2.12.8 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
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