viirya 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-595318275 Based on previous explanation, looks like the overflow happens during partial aggregate ( updateExpressions and mergeExpressions)? At final aggregate, is a check for null useful for the reported case here?
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