Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/8491#issuecomment-135836967
@mengxr WRT 1, completely agree and created SPARK-10333
WRT 2, I agree we should be consistent throughout the code examples.
However, I've felt awkward writing the Java examples at times because unlike
Scala and Python there is no REPL which injects the context variables in.
Keeping the main class makes it easy to paste the file, compile and JAR it, and
use `spark-submit` to run the code example.
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