Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1047#issuecomment-134442744
Merge part of chiwanpark's change, add the execute time for fraction sample
from 5 to 20. As changing input size from 10000 to 50000 would increase the
unit test costs from 15s to 74s in my local environment, it seems too much for
a unit test, so i didn't merge this part.
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