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https://issues.apache.org/jira/browse/CALCITE-7844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Efimov reassigned CALCITE-7844:
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Assignee: Aleksandr Efimov
> Decimal division scale reduction uses total precision instead of integral
> digits
> --------------------------------------------------------------------------------
>
> Key: CALCITE-7844
> URL: https://issues.apache.org/jira/browse/CALCITE-7844
> Project: Calcite
> Issue Type: Bug
> Reporter: Aleksandr Efimov
> Assignee: Aleksandr Efimov
> Priority: Major
>
> With a custom type system allowing precision and scale 38, DECIMAL(18,6) /
> DECIMAL(18,6) returns DECIMAL(38,6). The documented algorithm implies
> DECIMAL(38,20).
> In RelDataTypeSystem.deriveDecimalDivideType, the scale-reduction condition
> compares total precision with the bound instead of integral digits.
> Reproduced on main c425a5fa0; the same condition exists in 1.42.0. Related:
> CALCITE-6464.
> Correcting the condition also changes default inferred types: 95.0 / 100
> becomes DECIMAL(14,12) instead of DECIMAL(14,6). Incorrect numeric values
> have not been demonstrated.
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