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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