[jira] [Created] (FLINK-20831) Introduce the in memory topN buffer

[Shang Yuanchun (Jira)]

Shengkai Fang created FLINK-20831:
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             Summary: Introduce the in memory topN buffer
                 Key: FLINK-20831
                 URL: https://issues.apache.org/jira/browse/FLINK-20831
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / API
    Affects Versions: 1.13.0
            Reporter: Shengkai Fang
             Fix For: 1.13.0


The buffer is used to cache the record and only keep the topN records. When the invoker decide to emit or snapshot, it can get the sorted records from the buffer. The main benfit of the buffer is that it can reduce the per-record state visit.



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