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https://issues.apache.org/jira/browse/SPARK-28683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang resolved SPARK-28683.
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Resolution: Won't Fix
> Upgrade Scala to 2.12.9
> -----------------------
>
> Key: SPARK-28683
> URL: https://issues.apache.org/jira/browse/SPARK-28683
> Project: Spark
> Issue Type: Sub-task
> Components: Build
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> h3. Highlights
> * Faster compiler: [5–10% faster since
> 2.12.8|https://scala-ci.typesafe.com/grafana/dashboard/db/scala-benchmark?orgId=1&from=1543097847070&to=1564631199344&var-branch=2.12.x&var-source=All&var-bench=HotScalacBenchmark.compile&var-host=scalabench%40scalabench%40],
> thanks to many optimizations (mostly by Jason Zaugg and Diego E.
> Alonso-Blas: kudos!)
> * Improved compatibility with JDK 11, 12, and 13
> * Experimental support for build pipelining and outline type checking
> https://github.com/scala/scala/releases/tag/v2.12.9
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