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https://issues.apache.org/jira/browse/FLINK-20110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17853139#comment-17853139
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david radley commented on FLINK-20110:
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[~adrianalexvasiliu] I have had a look it looks like the PR was closed due to
inactivity so it is not in master or any other branches.
[@wangxlong|https://github.com/wangxlong] ,
[@leonardBang|https://github.com/leonardBang] Are you in a position to finish
this PR? I can help if required.
> 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: 1.12.0
> Reporter: hailong wang
> Priority: Major
> Labels: auto-unassigned, pull-request-available
> Fix For: 1.20.0
>
>
> 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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