xqwbx163 commented on issue #7240: summation calculation, the 2 decimal point 
becomes 6 or more
URL: 
https://github.com/apache/incubator-druid/issues/7240#issuecomment-472010080
 
 
   that is mysql sum result :
   
![image](https://user-images.githubusercontent.com/20455410/54205129-aade4f00-4510-11e9-8d33-f5ea7af0e5f2.png)
   orderday:2019-02-01 the sum total is 17058984.3
   But druid sum is 17058984.2967 ,
   This value will be a little less every day, 
   And as the number of days increases, the difference will big more.
   
   
   

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