Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1704#issuecomment-195491606
This pull request adds a lot of tests (which is actually good), but all
tests fire up a cluster to execute many programs. But need to somehow get this
down, as these "fire up mini cluster" tests have made our build times explode.
Is actual program execution needed here? Or is it sufficient to see that
the partial function for a certain transformation creates such a transformation?
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