[jira] [Created] (FLINK-20110) Support 'merge' method for first_value and last_value UDAF

[Shang Yuanchun (Jira)]

hailong wang created FLINK-20110:
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             Summary: 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


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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