Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22441#discussion_r218458224
  
    --- Diff: dev/create-release/release-build.sh ---
    @@ -414,15 +437,15 @@ if [[ "$1" == "publish-release" ]]; then
           -DskipTests $PUBLISH_PROFILES $SCALA_2_10_PROFILES clean install
       fi
     
    -  #./dev/change-scala-version.sh 2.12
    -  #$MVN -DzincPort=$ZINC_PORT -Dmaven.repo.local=$tmp_repo \
    -  #  -DskipTests $SCALA_2_12_PROFILES §$PUBLISH_PROFILES clean install
    +  if ! is_dry_run && [[ $PUBLISH_SCALA_2_12 = 1 ]]; then
    +    ./dev/change-scala-version.sh 2.12
    +    $MVN -DzincPort=$((ZINC_PORT + 2)) -Dmaven.repo.local=$tmp_repo 
-Dscala-2.12 \
    +      -DskipTests $PUBLISH_PROFILES $SCALA_2_12_PROFILES clean install
    +  fi
    --- End diff --
    
    I still think we want a cleanup step that always changes the scala version 
back to the 'default' of 2.11 right now.


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