[SPARK-28683][BUILD] Upgrade Scala to 2.12.10

## What changes were proposed in this pull request?

This PR upgrade Scala to **2.12.10**.

Release notes:
- Fix regression in large string interpolations with non-String typed splices
- Revert "Generate shallower ASTs in pattern translation"
- Fix regression in classpath when JARs have 'a.b' entries beside 'a/b'

- Faster compiler: 5–10% faster since 2.12.8
- Improved compatibility with JDK 11, 12, and 13
- Experimental support for build pipelining and outline type checking

More details:
https://github.com/scala/scala/releases/tag/v2.12.10
https://github.com/scala/scala/releases/tag/v2.12.9

## How was this patch tested?

Existing tests

Closes #25404 from wangyum/SPARK-28683.

Authored-by: Yuming Wang <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: wangyum

dev/deps/spark-deps-hadoop-2.7

@@ -172,10 +172,10 @@ parquet-jackson-1.10.1.jar
 protobuf-java-2.5.0.jar
 py4j-0.10.8.1.jar
 pyrolite-4.30.jar
-scala-compiler-2.12.8.jar
-scala-library-2.12.8.jar
+scala-compiler-2.12.10.jar
+scala-library-2.12.10.jar
 scala-parser-combinators_2.12-1.1.0.jar
-scala-reflect-2.12.8.jar
+scala-reflect-2.12.10.jar
 scala-xml_2.12-1.2.0.jar
 shapeless_2.12-2.3.2.jar
 shims-0.7.45.jar

dev/deps/spark-deps-hadoop-3.2

@@ -191,10 +191,10 @@ protobuf-java-2.5.0.jar
 py4j-0.10.8.1.jar
 pyrolite-4.30.jar
 re2j-1.1.jar
-scala-compiler-2.12.8.jar
-scala-library-2.12.8.jar
+scala-compiler-2.12.10.jar
+scala-library-2.12.10.jar
 scala-parser-combinators_2.12-1.1.0.jar
-scala-reflect-2.12.8.jar
+scala-reflect-2.12.10.jar
 scala-xml_2.12-1.2.0.jar
 shapeless_2.12-2.3.2.jar
 shims-0.7.45.jar

docs/_config.yml

@@ -17,7 +17,7 @@ include:
 SPARK_VERSION: 3.0.0-SNAPSHOT
 SPARK_VERSION_SHORT: 3.0.0
 SCALA_BINARY_VERSION: "2.12"
-SCALA_VERSION: "2.12.8"
+SCALA_VERSION: "2.12.10"
 MESOS_VERSION: 1.0.0
 SPARK_ISSUE_TRACKER_URL: https://issues.apache.org/jira/browse/SPARK
 SPARK_GITHUB_URL: https://github.com/apache/spark

external/docker/spark-test/base/Dockerfile

@@ -25,7 +25,7 @@ RUN apt-get update && \
     apt-get install -y less openjdk-8-jre-headless iproute2 vim-tiny sudo openssh-server && \
     rm -rf /var/lib/apt/lists/*
 
-ENV SCALA_VERSION 2.12.8
+ENV SCALA_VERSION 2.12.10
 ENV CDH_VERSION cdh4
 ENV SCALA_HOME /opt/scala-$SCALA_VERSION
 ENV SPARK_HOME /opt/spark

pom.xml

@@ -164,7 +164,7 @@
     <commons.math3.version>3.4.1</commons.math3.version>
     <!-- managed up from 3.2.1 for SPARK-11652 -->
     <commons.collections.version>3.2.2</commons.collections.version>
-    <scala.version>2.12.8</scala.version>
+    <scala.version>2.12.10</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <scalafmt.parameters>--diff --test</scalafmt.parameters>
     <!-- for now, not running scalafmt as part of default verify pipeline -->

project/SparkBuild.scala

@@ -223,7 +223,7 @@ object SparkBuild extends PomBuild {
       .map(file),
     incOptions := incOptions.value.withNameHashing(true),
     publishMavenStyle := true,
-    unidocGenjavadocVersion := "0.13",
+    unidocGenjavadocVersion := "0.14",
 
     // Override SBT's default resolvers:
     resolvers := Seq(

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala

@@ -72,7 +72,7 @@ object ScalaReflection extends ScalaReflection {
   /**
    * Synchronize to prevent concurrent usage of `<:<` operator.
    * This operator is not thread safe in any current version of scala; i.e.
-   * (2.11.12, 2.12.8, 2.13.0-M5).
+   * (2.11.12, 2.12.10, 2.13.0-M5).
    *
    * See https://github.com/scala/bug/issues/10766
    */