[jira] [Created] (FLINK-11689) Code clean for StreamingJobGraphGenerator

[Shang Yuanchun (Jira)]

shiwuliang created FLINK-11689:
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             Summary: Code clean for StreamingJobGraphGenerator
                 Key: FLINK-11689
                 URL: https://issues.apache.org/jira/browse/FLINK-11689
             Project: Flink
          Issue Type: Improvement
            Reporter: shiwuliang


* use computeIfAbsent for code clean
* delete useless object



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