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https://issues.apache.org/jira/browse/FLINK-8364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313298#comment-16313298
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Aljoscha Krettek commented on FLINK-8364:
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+1 to what [~fhueske] said!
> ListState should return empty iterator rather than null when it has no value
> ----------------------------------------------------------------------------
>
> Key: FLINK-8364
> URL: https://issues.apache.org/jira/browse/FLINK-8364
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: Bowen Li
> Assignee: Bowen Li
> Fix For: 1.5.0
>
>
> per discussion with [~stefanrichte...@gmail.com] in
> https://github.com/apache/flink/pull/4963, we decide to have
> {{ListState#get}} return empty iterator if it has no value in it.
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