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https://issues.apache.org/jira/browse/FLINK-11689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16786855#comment-16786855
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Aljoscha Krettek commented on FLINK-11689:
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Please don't put messages about where it was fixed in the release notes.
> Code clean for StreamingJobGraphGenerator
> -----------------------------------------
>
> Key: FLINK-11689
> URL: https://issues.apache.org/jira/browse/FLINK-11689
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Reporter: shiwuliang
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> * use computeIfAbsent for code clean
> * delete useless object
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