wangyum opened a new pull request #27929: [WIP][SPARK-31168][BUILD] Upgrade Scala to 2.12.11 URL: https://github.com/apache/spark/pull/27929 ### What changes were proposed in this pull request? This PR upgrade Scala to **2.12.11**. Scala 2.12.11 release notes: **Highlights** - Performance improvements in the collections library - Performance improvements in the compiler - Improvements to `-Yrepl-class-based`, an alternative internal REPL encoding that avoids deadlocks - A new `-Yrepl-use-magic-imports` flag that avoids deep class nesting in the REPL, which can lead to deteriorating performance in long sessions - Fix some toX methods that could expose the underlying mutability of a ListBuffer-generated collection **JDK 9+ support** - ASM was upgraded to 7.3.1, allowing the optimizer to run on JDK 13+ - `:javap` in the REPL now works on JDK 9+ ### Why are the changes needed? Improvement performance. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Exist test.
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