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https://issues.apache.org/jira/browse/FLINK-20110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18056231#comment-18056231
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david radley commented on FLINK-20110:
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[~nilerzhou] are you still interested in working on this? If so please go
ahead. I have just been made a committer and there issues will my increased
authority - I will assign the Jira to you when the authority comes though to
me. In the meantime can you confirm you still want to work on 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 / Runtime
> Affects Versions: 2.1.0
> Reporter: hailong wang
> Priority: Major
> Labels: auto-unassigned, pull-request-available
> Fix For: 2.3.0
>
>
> 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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