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https://issues.apache.org/jira/browse/SPARK-8285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14580051#comment-14580051
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Apache Spark commented on SPARK-8285:
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User 'navis' has created a pull request for this issue:
https://github.com/apache/spark/pull/6736
> 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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