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https://issues.apache.org/jira/browse/CALCITE-3187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882186#comment-16882186
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Julian Hyde commented on CALCITE-3187:
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The extension point for this kind of stuff is RelDataTypeSystem, not
RelDataTypeFactory.
I think the methods are mis-named. They do type inference for all addition and
mod, not just DECIMAL. Because it’s difficult to know a priori whether the
inferred type will be DECIMAL, as opposed to another numeric type.
> Derive all decimal return type through type factory
> ---------------------------------------------------
>
> Key: CALCITE-3187
> URL: https://issues.apache.org/jira/browse/CALCITE-3187
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Praveen Kumar Desabandu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently decimal product and quotient return types are derived through type
> factory, this allows clients to override the return type if they so desire.
> But decimal sum is embedded in return types, also decimal mod does not have a
> return type inference defined.
> This task is to derive all of the return types through type factory, so that
> clients can override if they wish to.
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