Benedict created CASSANDRA-15232:

             Summary: Arithmetic operators over decimal truncate results
                 Key: CASSANDRA-15232
             Project: Cassandra
          Issue Type: Bug
            Reporter: Benedict

The decimal operators hard-code a 128 bit precision for their computations.  
Probably a precision needs to be configured or decided somehow, but it’s not 
clear why 128bit was chosen.  Particularly for multiplication and addition, 
it’s very unclear why we truncate, which is different to our behaviour for e.g. 
sum() aggregates.  Probably for division we should also ensure that we do not 
reduce the precision of the two operands.  A minimum of decimal128 seems 
reasonable, but a maximum does not.

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