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Posted to dev@flink.apache.org by "sunjincheng (JIRA)" <ji...@apache.org> on 2018/01/03 14:39:00 UTC

[jira] [Created] (FLINK-8355) DataSet Should not union a NULL row for AGG without GROUP BY clause.

sunjincheng created FLINK-8355:
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             Summary: DataSet Should not union a NULL row for AGG without GROUP BY clause.
                 Key: FLINK-8355
                 URL: https://issues.apache.org/jira/browse/FLINK-8355
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.5.0
            Reporter: sunjincheng


Currently {{DataSetAggregateWithNullValuesRule}} will UINON a NULL row for  non grouped aggregate query. when {{CountAggFunction}} support {{COUNT(*)}}(FLINK-8325).  the result will incorrect.
for example, if Tabble {{T1}} has 3 records. when we run the follow SQL in DataSet: 
{code}
SELECT COUNT(*) as cnt from Tab // cnt = 4(incorrect).
{code}



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