Github user gslowikowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/18750#discussion_r129849368
--- Diff: pom.xml ---
@@ -1972,14 +1972,12 @@
</execution>
<execution>
<id>scala-compile-first</id>
- <phase>process-resources</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>scala-test-compile-first</id>
- <phase>process-test-resources</phase>
--- End diff --
Changing phase to one before `compile` is very old trick, used when
`scala-maven-plugin` compiles only Scala classes and this compilation must be
performed before Java classes compilation (by `maven-compiler-plugin`) because
Java classes depend on Scala classes.
In incremental compilation mode SBT compiler is used internally and it
compiles everything. Because `maven-compiler-plugin` is disabled (compilations
are skipped), there is no need to change default phase.
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