vvysotskyi commented on issue #1453: DRILL-6710: Disallow negative scale for 
decimal data type
URL: https://github.com/apache/drill/pull/1453#issuecomment-417605255
 
 
   Thanks for the review!
   
   Currently, such behavior of aggregate functions cannot be fixed because 
Drill does not know the input type of the function and rewrites it using `SUM` 
and `COUNT` aggregate functions. For regular types, it is ok, since results of 
these intermediate agg calls may be reused, but for decimals due to type 
inference rules, intermediate calculations on the results of agg calls may 
cause overflow.

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