Github user sunjincheng121 commented on the issue: https://github.com/apache/flink/pull/3418 @fhueske thanks for your review. I have updated the PR. IMO. The main purpose of doing this PR is to enhance the function of Flat/MapRunner. In addition, my next plan is: Use CODE-GEN to generate the class which below the `org.apache.flink.table.runtime.aggregate` package, perhaps this PR will help me in the next work. What do you think?
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