cloud-fan commented on issue #27627: [WIP][SPARK-28067][SQL] Fix incorrect results for decimal aggregate sum by returning null on decimal overflow URL: https://github.com/apache/spark/pull/27627#issuecomment-589530921 > Sum does not take care of possibility of overflow for the intermediate steps. ie the updateExpressions and mergeExpressions. I'm a little confused. These expressions are used in non-whole-stage-codegen as well, why only whole-stage-codegen has the problem?
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