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When a UNION operation involving DECIMAL datatypes with scale and digits before the decimal exceeds the currently supported maximum precision of 38, we throw an error to the user: "MCS-2060: Union operation exceeds maximum DECIMAL precision of 38". This is until MCOL-5417 is implemented where ColumnStore will have full parity with MariaDB server in terms of maximum supported DECIMAL precision and scale of 65 and 38 digits respectively.