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https://issues.apache.org/jira/browse/FLINK-28104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555564#comment-17555564
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Benchao Li commented on FLINK-28104:
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Although this is not documented, however we have used this in some cases.
> Drop the unused order parameter in FirstValueFunction/LastValueFunction
> -----------------------------------------------------------------------
>
> Key: FLINK-28104
> URL: https://issues.apache.org/jira/browse/FLINK-28104
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API, Table SQL / Planner
> Reporter: luoyuxia
> Priority: Major
> Fix For: 1.16.0
>
>
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