Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/988#issuecomment-127926607
If I understand correctly, this also this changes the semantics that we
execute programs without sinks, and also topology branches which don't end in
sinks. I personally don't like the fact that the each branch in the processing
graph needs to end in a sink, it is rather artificial.
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