[OASIS Issue Tracker] (ODATA-784) Need to specify the behaviour of arithmetic operators on Decimal type

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

    [ https://issues.oasis-open.org/browse/ODATA-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61554#comment-61554 ] 

Michael Pizzo commented on ODATA-784:
-------------------------------------

All of the implementations follow Evan's proposed rules for add/sub/mult. None of the implementations appear to follow Evan's rule for div.

Most of the Div examples seems to return the value in the max scale of the underlying type.  
=>How would a client know this value?
=>If an implementation is aggregating data from multiple underlying sources, how could it return (or even correct for) a single value for max scale? Would it be forced to convert everything to the min max scale?

There seem to be at least 5 proposals for div:
Scale(A)
Scale(A)+Scale(B)
Scale(A)-Scale(B)
>= Scale(A)  (doesn't seem to address Evan's second case  (A div 3) gt 0.3)
max precision of decimal

Susan will look to see what IEEE 754-2008 (ISO/IEC/IEEE 60559:2011) specifies.

> Need to specify the behaviour of arithmetic operators on Decimal type
> ---------------------------------------------------------------------
>
>                 Key: ODATA-784
>                 URL: https://issues.oasis-open.org/browse/ODATA-784
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData URL Conventions
>    Affects Versions: V4.0_OS
>         Environment: Proposed
>            Reporter: Evan Ireland
>            Priority: Minor
>             Fix For: V4.01_WD01, V4.0_ERRATA03
>
>
> The rules for scale of results of decimal arithmetic operators are not specified.



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