Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20023
Regarding the rules for deciding precision and scales, DB2 z/OS also has
its own rules:
https://www.ibm.com/support/knowledgecenter/en/SSEPEK_10.0.0/sqlref/src/tpc/db2z_witharithmeticoperators.html
Could you compare it with MS SQL Server?
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