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https://issues.apache.org/jira/browse/CALCITE-3187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882643#comment-16882643
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Praveen Kumar Desabandu commented on CALCITE-3187:
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[~julianhyde] Per my understanding, I do not think the methods are mis-named, 
these methods operate only on decimal operands. Return types then has a chain 
that uses decimal inference first and if operands are not applicable falls back 
to normal inference.

Also - can we please finalize on the approach?

> 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: 2h
>  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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