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https://issues.apache.org/jira/browse/CASSANDRA-15232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict updated CASSANDRA-15232:
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Source Control Link:
[d60e7988736ed4358595e9c781b110a5bbb5f812|https://github.com/apache/cassandra/commit/d60e7988736ed4358595e9c781b110a5bbb5f812]
Status: Resolved (was: Ready to Commit)
Resolution: Fixed
> Arithmetic operators over decimal truncate results
> --------------------------------------------------
>
> Key: CASSANDRA-15232
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15232
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Semantics
> Reporter: Benedict
> Assignee: Liudmila Kornilova
> Priority: Normal
> Labels: pull-request-available
> Fix For: 4.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> 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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