[jira] [Created] (SPARK-8285) CombineSum should be calculated as unlimited decimal first

["Navis (JIRA)" <ji...@apache.org>]

Navis created SPARK-8285:
----------------------------

             Summary: CombineSum should be calculated as unlimited decimal first
                 Key: SPARK-8285
                 URL: https://issues.apache.org/jira/browse/SPARK-8285
             Project: Spark
          Issue Type: Bug
          Components: SQL
            Reporter: Navis
            Priority: Trivial


{code:title=GeneratedAggregate.scala}
case cs @ CombineSum(expr) =>
        val calcType = expr.dataType
          expr.dataType match {
            case DecimalType.Fixed(_, _) =>
              DecimalType.Unlimited
            case _ =>
              expr.dataType
          }
{code}
calcType is always expr.dataType. credits are all belong to IntelliJ



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