Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1397#issuecomment-170451422
I still would like to use enumeration because if we use string parameters,
the user cannot check that the input parameter is valid. But if you have some
problems to use enumeration, I'll modify your pull request before merging it.
Failing CI seems unrelated this PR. I'll check and test this.
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