DTStack / DTStack/chunjun

flinksql 数据分组后批量写clickhouse问题

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Description

flinksql 数据分组后按2000一组批量写到Clickhouse,但是发现ck中每组数据都有2000条

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![image](https://user-images.githubusercontent.com/7970677/168933520-0e10cf5d-2d25-4a34-8775-8fec909417f9.png)

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