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https://issues.apache.org/jira/browse/FLINK-18406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17142651#comment-17142651
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Zhu Zhu commented on FLINK-18406:
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Well I see that @Nullable annotations are still good to have, considering the
case to query via a non-existent input key.
> Annotate DualKeyLinkedMap with @Nullable annotation
> ---------------------------------------------------
>
> Key: FLINK-18406
> URL: https://issues.apache.org/jira/browse/FLINK-18406
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Coordination
> Affects Versions: 1.11.0, 1.12.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> In order to avoid wrong usage of {{DualKeyLinkedMap}} I think we should
> annotate those methods which can return a {{null}} value. That way, the IDE
> can help highlighting were we access values without proper null checks.
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