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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