liuyongvs opened a new pull request #9966: [FLINK-14053] [blink-planner] 
DenseRankAggFunction.accumulateExpressions. it should be thinki…
URL: https://github.com/apache/flink/pull/9966
 
 
   # What is the purpose of the change
   - dense_rank is not thinking about the the order by expression equals to  
inital lastValue. This PR is to fix this corner case
   # Brief change log
   - modify the logic 
   - add one unit test
   # Does this pull request potentially affect one of the following parts:
   - doen't affect others
   # Documentation
   Does this pull request introduce a new feature? (yes / ***no***)
   If yes, how is the feature documented? (***not applicable*** / docs / 
JavaDocs / not documented)

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