[jira] [Created] (FLINK-26840) [minor refactor] Add a common TopNBufferCacheRemovalListener for topN function

[lincoln lee (Jira)]

lincoln lee created FLINK-26840:
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             Summary: [minor refactor] Add a common 
TopNBufferCacheRemovalListener for topN function
                 Key: FLINK-26840
                 URL: https://issues.apache.org/jira/browse/FLINK-26840
             Project: Flink
          Issue Type: Improvement
    Affects Versions: 1.15.0
            Reporter: lincoln lee
             Fix For: 1.16.0


Currently the FastTop1Function and UpdatableTopNFunction created a private 
CacheRemovalListener which can be general. So do a minor refactor that add a 
new TopNBufferCacheRemovalListener instead.




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