Status

Current state: "Under Discussion"

Discussion thread: 

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In the early days of Flink, the Program interface was the only way to submit a job.
The user code should implement this interface and return the Plan of the job to Flink.

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branches in the PackagedProgram  class

2. the program and   and plan fields   fields in the same class

3. all the code in the project that is executed when the PackagedProgram.isUsingProgramEntryPoint() is true

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