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

    https://github.com/apache/spark/pull/12334#discussion_r59598076
  
    --- Diff: assembly/pom.xml ---
    @@ -20,7 +20,7 @@
       <modelVersion>4.0.0</modelVersion>
       <parent>
         <groupId>org.apache.spark</groupId>
    -    <artifactId>spark-parent_2.11</artifactId>
    +    <artifactId>spark-parent</artifactId>
    --- End diff --
    
    Empirically, it looks like the generated POMS which are used for publishing 
end up with all variables in the `<dependencies>` section having been expanded 
according to whichever profile was active at publication time. For example, in 
http://central.maven.org/maven2/org/apache/spark/spark-core_2.10/1.6.1/spark-core_2.10-1.6.1.pom,
 there are no references to `scala.binary.version` in the `<dependencies>` 
section. There _are_ references in the `<build>` section but I don't think that 
this is relevant to consumers of this POM since I don't expect people to depend 
on our child POMs in their own builds. 


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