[jira] [Created] (FLINK-22314) AggRecordsCombiner should combine buffered records first instead of accumulate on state directly

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-22314:
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             Summary: AggRecordsCombiner should combine buffered records first instead of accumulate on state directly
                 Key: FLINK-22314
                 URL: https://issues.apache.org/jira/browse/FLINK-22314
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Runtime
            Reporter: Jark Wu


In Window TVF Aggregation, currently, the {{AggRecordsCombiner}} accumulates buffered records on state directly. This is not good for performance. We can accumulate records in memory first, and then merge the accumulator into state, if the aggs support {{merge()}} method. This can reduce lots of state accessing when having {{COUNT DISTINCT}}.



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