Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/14637#discussion_r75574292
--- Diff: project/SparkBuild.scala ---
@@ -56,9 +56,9 @@ object BuildCommons {
"tags", "sketch"
).map(ProjectRef(buildLocation, _)) ++ sqlProjects ++ streamingProjects
- val optionallyEnabledProjects@Seq(yarn, java8Tests, sparkGangliaLgpl,
+ val optionallyEnabledProjects@Seq(mesos, yarn, java8Tests,
sparkGangliaLgpl,
--- End diff --
This is a pattern matching on assignment feature in Scala and the line
creates one `optionallyEnabledProjects` value for the entire `Seq` of projects
with respective projects being their own values `mesos` etc.
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