Github user sadhen commented on the issue:
https://github.com/apache/spark/pull/22308
@srowen The 2.12 jar is compiled and packaged from `Main.scala` and
`MyCoolClass.scala`. Not a copy of 2.10 jar. Diff it, you will verify it.
The steps to generate it:
```
mvn install // install the 2.4.0-SNAPSHOT at project root
sbt package // package at
sql/hive/src/test/resources/regression-test-SPARK-8489
```
This is the build.sbt:
```
scalaVersion := 2.12.6
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-sql" % "2.4.0-SNAPSHOT"
)
```
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