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https://issues.apache.org/jira/browse/FLINK-20110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17235892#comment-17235892
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Jark Wu commented on FLINK-20110:
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Hi [~hailong wang], do you want to try this?
> Support 'merge' method for first_value and last_value UDAF
> ----------------------------------------------------------
>
> Key: FLINK-20110
> URL: https://issues.apache.org/jira/browse/FLINK-20110
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Affects Versions: 1.12.0
> Reporter: hailong wang
> Priority: Major
>
> From the user-zh email, when use first_value function in hop window, It
> throws the exception because first_vaue does not implement the merge method.
> We can support 'merge' method for first_value and last_value UDAF
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