did not find the official definition of SUM aggregation in ansi sql standards. but in https://msdn.microsoft.com/en-us/library/ms187810.aspx it seems the return type for bigint is bigint.
BTW, what changes did you make? why it worked previously? -- Regards, *Bin Mahone | 马洪宾* Apache Kylin: http://kylin.io Github: https://github.com/binmahone
