Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/457#issuecomment-40903659
One other thing that you might consider is turning on the option to
generate Type Hierarchy diagrams in the published scaladocs. It's not hard to
do, and works well if you've got the necessary external dependencies installed
and configured, but I wouldn't recommend turning the option on by default since
anyone trying to build the docs on their own will see a bunch of errors if
Graphviz isn't already installed.
You can see the results of the `-diagrams` option by looking at the
scala-lang Scala API docs and expanding the Type Hierarchy section in the
description of any class.
http://lamp.epfl.ch/files/content/sites/lamp/files/teaching/student-project-reports/semester/DamienObrist-SemesterProjectReport.pdf
http://stackoverflow.com/questions/13435474/how-to-generate-type-hierarchy-diagrams-with-scaladoc
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