Yuming Wang created SPARK-28683:
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Summary: 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
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 (see below)
* Experimental support for build pipelining and outline type checking (see
below)
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