[OASIS Issue Tracker] Updated: (ODATA-9) allow expressions in the $select query option

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

     [ http://tools.oasis-open.org/issues/browse/ODATA-9?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Pizzo updated ODATA-9:
------------------------------

       Proposal: 
We have laid the necessary groundwork for adding this type of functionality in the future without breaking V4 clients.

Defer the work required to define such an extension to a future version of OData.
    Environment: [Proposed]

Note that $select is probably not the right place to introduce properties. Currently, $select is really just a serialization hint that says "I care only about these properties". Services are explicitly allowed to ignore the $select clause altogether and return full results.

Similar to $expand and $aggregate, if we want to shape/extend the results we should do so in a separate query option and have $select operate over that expanded/extended/shaped result. This allows such expressions to be used in other parts of the request such as aggregates or ordering.

I do note that, by requiring that clients be prepared to handle properties not defined in metadata, we have laid the necessary groundwork for adding an extension to return dynamic/calculated properties in the future without breaking existing clients.

I suggest we don't try and add this functionality at this time.

> allow expressions in the $select query option
> ---------------------------------------------
>
>                 Key: ODATA-9
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-9
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Protocol , OData URL Conventions 
>         Environment: [Proposed]
>            Reporter: Andrew Eisenberg
>            Assignee: Michael Pizzo
>
> OData could be extended to allow expressions in the $select query option, allowing derived values to be returned along with the properties of an entity.
> This could be expressed as:
> http://odata.netflix.com/v2/Catalog/Titles?$select=Name,substring(ShortSynopsis,20) as Summary
> or
> http://odata.netflix.com/v2/Catalog/Titles?$select=Name&$extendedSelect=substring(ShortSynopsis,20) as Summary

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