[jira] [Created] (FLINK-4666) Make constants final in ParameterTool

[Shang Yuanchun (Jira)]

Alexander Pivovarov created FLINK-4666:
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             Summary: Make constants final in ParameterTool
                 Key: FLINK-4666
                 URL: https://issues.apache.org/jira/browse/FLINK-4666
             Project: Flink
          Issue Type: Bug
          Components: Java API
            Reporter: Alexander Pivovarov
            Priority: Trivial


NO_VALUE_KEY and DEFAULT_UNDEFINED in ParameterTool should be final



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