Benedict created CASSANDRA-15232:
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Summary: Arithmetic operators over decimal truncate results
Key: CASSANDRA-15232
URL: https://issues.apache.org/jira/browse/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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