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https://issues.apache.org/jira/browse/FLINK-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516249#comment-15516249
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ASF GitHub Bot commented on FLINK-4666:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/2538
> Make constants to be 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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