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https://issues.apache.org/jira/browse/FLINK-13582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16921244#comment-16921244
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Jark Wu commented on FLINK-13582:
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I think we didn't promise users that keeping job upgrade compatibility between
major releases.
> Improve the implementation of LISTAGG in Blink planner to remove delimiter
> from state
> --------------------------------------------------------------------------------------
>
> Key: FLINK-13582
> URL: https://issues.apache.org/jira/browse/FLINK-13582
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.10.0
> Reporter: Jing Zhang
> Assignee: Jark Wu
> Priority: Minor
>
> The implementation of LISTAGG save delimiter as a part of state, which is not
> necessary, because delimiter is constant character.
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