Flink streaming sql是否支持两层group by聚合

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URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-streaming-sql-group-by-tp34412.html

Hi all:

我们有个streaming sql得到的结果不正确，现象是sink得到的数据一会大一会小，我们想确认下，这是否是个bug， 或者flink还不支持这种sql。

具体场景是：先group by A, B两个维度计算UV，然后再group by A 把维度B的UV sum起来，对应的SQL如下：（A -> dt,  B -> pvareaid)

SELECT dt, SUM(a.uv) AS uv
FROM (
   SELECT dt, pvareaid, COUNT(DISTINCT cuid) AS uv
   FROM streaming_log_event
   WHERE action IN ('action1')
      AND pvareaid NOT IN ('pv1', 'pv2')
      AND pvareaid IS NOT NULL
   GROUP BY dt, pvareaid
) a
GROUP BY dt;

sink接收到的数据对应日志为：

我们使用的是1.7.2， 测试作业的并行度为1。

这是对应的 issue: https://issues.apache.org/jira/browse/FLINK-17228

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