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https://issues.apache.org/jira/browse/FLINK-18560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caizhi Weng resolved FLINK-18560.
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Resolution: Implemented
> Introduce collect iterator with at least once semantics and exactly once
> semantics without fault tolerance
> ----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-18560
> URL: https://issues.apache.org/jira/browse/FLINK-18560
> Project: Flink
> Issue Type: Sub-task
> Components: API / DataStream, Table SQL / API
> Reporter: Caizhi Weng
> Priority: Major
> Fix For: 1.12.0
>
>
> See FLINK-18558 for more information.
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