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### What changes were proposed in this pull request? This PR aims the followings. 1. Upgrade from Scala 2.13.3 to 2.13.4 for Apache Spark 3.1 2. Fix exhaustivity issues in both Scala 2.12/2.13 (Scala 2.13.4 requires this for compilation.) 3. Enforce the improved exhaustive check by using the existing Scala 2.13 GitHub Action compilation job. ### Why are the changes needed? Scala 2.13.4 is a maintenance release for 2.13 line and improves JDK 15 support. - https://github.com/scala/scala/releases/tag/v2.13.4 Also, it improves exhaustivity check. - https://github.com/scala/scala/pull/9140 (Check exhaustivity of pattern matches with "if" guards and custom extractors) - https://github.com/scala/scala/pull/9147 (Check all bindings exhaustively, e.g. tuples components) ### Does this PR introduce _any_ user-facing change? Yep. Although it's a maintenance version change, it's a Scala version change. ### How was this patch tested? Pass the CIs and do the manual testing. - Scala 2.12 CI jobs(GitHub Action/Jenkins UT/Jenkins K8s IT) to check the validity of code change. - Scala 2.13 Compilation job to check the compilation Closes #30455 from dongjoon-hyun/SCALA_3.13. Authored-by: Dongjoon Hyun <dongjoon@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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