Backport build system fixes from upstream datastax#1361

build.sbt

@@ -4,7 +4,8 @@ import sbt.{Compile, moduleFilter, _}
 import sbtassembly.AssemblyPlugin.autoImport.assembly
 
 lazy val scala212 = "2.12.11"
-lazy val supportedScalaVersions = List(scala212)
+lazy val scala213 = "2.13.11"
+lazy val supportedScalaVersions = List(scala212, scala213)
 
 // factor out common settings
 ThisBuild / scalaVersion := scala212
@@ -60,16 +61,18 @@ lazy val commonSettings = Seq(
   fork := true,
   parallelExecution := true,
   testForkedParallel := false,
-  testOptions += Tests.Argument(TestFrameworks.JUnit, "-v")
+  testOptions += Tests.Argument(TestFrameworks.JUnit, "-v"),
 )
 
+
 val annotationProcessor = Seq(
   "-processor", "com.datastax.oss.driver.internal.mapper.processor.MapperProcessor"
 )
 
 def scalacVersionDependantOptions(scalaBinary: String): Seq[String] = scalaBinary match {
   case "2.11" => Seq()
   case "2.12" => Seq("-no-java-comments") //Scala Bug on inner classes, CassandraJavaUtil,
+  case "2.13" => Seq("-no-java-comments") //Scala Bug on inner classes, CassandraJavaUtil,
 }
 
 lazy val root = (project in file("."))
@@ -81,6 +84,7 @@ lazy val root = (project in file("."))
     publish / skip := true
   )
 
+
 lazy val connector = (project in file("connector"))
   .configs(IntegrationTest)
   .settings(Defaults.itSettings: _*) //This and above enables the "it" suite
@@ -105,6 +109,7 @@ lazy val connector = (project in file("connector"))
     Global / concurrentRestrictions := Seq(Tags.limitAll(Testing.parallelTasks)),
 
     libraryDependencies ++= Dependencies.Spark.dependencies
+      ++ Dependencies.Compatibility.dependencies(scalaVersion.value)
       ++ Dependencies.TestConnector.dependencies
       ++ Dependencies.Jetty.dependencies,
 
@@ -121,7 +126,8 @@ lazy val testSupport = (project in file("test-support"))
   .settings(
     crossScalaVersions := supportedScalaVersions,
     name := "spark-cassandra-connector-test-support",
-    libraryDependencies ++= Dependencies.TestSupport.dependencies
+    libraryDependencies ++= Dependencies.Compatibility.dependencies(scalaVersion.value)
+      ++ Dependencies.TestSupport.dependencies
   )
 
 lazy val driver = (project in file("driver"))
@@ -131,7 +137,8 @@ lazy val driver = (project in file("driver"))
     crossScalaVersions := supportedScalaVersions,
     name := "spark-cassandra-connector-driver",
     assembly /test := {},
-    libraryDependencies ++= Dependencies.Driver.dependencies
+    libraryDependencies ++= Dependencies.Compatibility.dependencies(scalaVersion.value)
+      ++ Dependencies.Driver.dependencies
       ++ Dependencies.TestDriver.dependencies
       :+ ("org.scala-lang" % "scala-reflect" % scalaVersion.value)
   )

project/Dependencies.scala

@@ -79,9 +79,22 @@ object Dependencies
     val commonsLang3 = "org.apache.commons" % "commons-lang3" % Versions.CommonsLang3
     val paranamer = "com.thoughtworks.paranamer" % "paranamer" % Versions.Paranamer
 
+
     val dependencies = Seq(driverCore, driverMapper, commonsLang3, paranamer)
   }
 
+  object Compatibility {
+    val scalaCompat = "org.scala-lang.modules" %% "scala-collection-compat" % Versions.ScalaCompat
+    val parallelCollections = "org.scala-lang.modules" %% "scala-parallel-collections" % Versions.ParallelCollections
+
+    def dependencies(version: String): Seq[ModuleID] = {
+      CrossVersion.partialVersion(version) match {
+        case Some((2, scalaMajor)) if scalaMajor == 13 => Seq(scalaCompat, parallelCollections)
+        case _ => Seq(scalaCompat)
+      }
+    }
+  }
+
   object TestDriver {
     val dependencies = Seq(
       TestCommon.scalaTest % "test",

project/Versions.scala

@@ -25,14 +25,6 @@ object Versions {
   val SparkJetty      = "9.3.27.v20190418"
   val SolrJ           = "8.3.0"
 
-  /*
-  val status = (versionInReapply: String, binaryInReapply: String) =>
-    println(s"""
-               |  Scala: $versionInReapply
-               |  Scala Binary: $binaryInReapply
-               |  Java: target=$JDK user=${Properties.javaVersion}
-               |  Cassandra version for testing: ${Testing.cassandraTestVersion} [can be overridden by specifying '-Dtest.cassandra.version=<version>']
-        """.stripMargin)
-
-   */
+  val ScalaCompat         = "2.11.0"
+  val ParallelCollections = "1.0.4"
 }