[OASIS Issue Tracker] (ODATA-827) introduce $compute query option

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

     [ https://issues.oasis-open.org/browse/ODATA-827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gerald Krause updated ODATA-827:
--------------------------------

    Proposal: 
Add "$compute" query option allowing additional compute properties to be added to each instance.
$compute is allowed as query option applied to $expand.

  was:Add "$compute" query option allowing additional compute properties to be added to each instance.


$compute is also helpful to introduce dynamic properties in expanded entities, such as GET ~/OrgUnits('123')?$expand=Members($compute=date(now())-BirthDate as Age), therefore extended the proposal.

> introduce $compute query option
> -------------------------------
>
>                 Key: ODATA-827
>                 URL: https://issues.oasis-open.org/browse/ODATA-827
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Protocol, OData URL Conventions
>    Affects Versions: V4.0_WD01
>            Reporter: Andrew Eisenberg
>              Labels: GoodIdea, Usability
>             Fix For: V4.01_WD01
>
>
> OData could be extended to allow derived computed values to be returned along with the properties of an entity.
> This could be expressed as:
> http://odata.netflix.com/v2/Catalog/Titles?$compute=substring(ShortSynopsis,20) as Summary&$select=Name,Summary
> In ODATA-9 we added support for an equivalent compute transformation in our Data Aggregation Extensions. 



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