[ https://issues.oasis-open.org/browse/ODATA-827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ralf Handl updated ODATA-827:
-----------------------------
Proposal:
Add "$compute" query option allowing additional compute properties to be added to each instance. The syntax is identical to the compute() transformation in Data Aggregation, i.e. compute(<list of compute expressions>) -> $compute=<list of compute expressions>. Especially the restriction to simple values remains:
A compute expression is an expression valid in a $filter system query option on the input set that results in a simple value.
$compute is also allowed as query option nested within $expand to add computed simple dynamic properties to expanded entities.
was:
Add "$compute" query option allowing additional compute properties to be added to each instance.
$compute is allowed as query option applied to $expand.
$compute=... is just a shorthand for $apply=compute(...), and the compute expressions are restricted to simple values, so I see no conflict with $expand.
> introduce $compute query option
> -------------------------------
>
> Key: ODATA-827
> URL: https://issues.oasis-open.org/browse/ODATA-827
> Project: OASIS Open Data Protocol (OData) TC
> Issue Type: Improvement
> Components: OData Protocol, OData URL Conventions
> Affects Versions: V4.0_WD01
> Environment: New Query Capabilities
> Reporter: Andrew Eisenberg
> Labels: GoodIdea, Usability
> Fix For: V4.01_WD01
>
>
> OData could be extended to allow derived computed values to be returned along with the properties of an entity.
> This could be expressed as:
> http://odata.netflix.com/v2/Catalog/Titles?$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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