matriv commented on pull request #17634:
URL: https://github.com/apache/flink/pull/17634#issuecomment-960725346


   @tsreaper Thx a lot for your review, Actually we decided to revert this 
change, so instead I've added comments that the LogicalTypeMerging doesn't 
follow 100% the Microsoft SQL server rules but instead a mixed approach adopted 
by Hive/Spark. So the fix for the SUM precision is made by adding an explicit 
cast in the implementation wrapping the `plus()` to preserve the 
precision/scale calculated separately for SUM and don't allow the addition 
rules to override it.


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