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Subject: [OASIS Issue Tracker] Created: (ODATA-199) $expand should be allowed to return only ids for already seen objects


$expand should be allowed to return only ids for already seen objects
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                 Key: ODATA-199
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-199
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData ATOM Format v1.0, OData JSON Format v1.0
         Environment: [Proposed]
            Reporter: Michael Pizzo
            Priority: Minor


Today, specifying $expand may return the same item multiple times. For example, if the someone is really popular, selecting ~people/$expand=friends may return the same friend for multiple people. This can lead to payload bloat when attempting to select a graph of related entities.

A simple means of compression would be to allow the service to return only the id of related entities that have already been returned within a feed. This would work nicely for existing clients that track incoming entities as they generally already have logic to merge with or simply return previously retrieved objects.

We might consider a preference to allow the client to request whether or not duplicate ids are returned in full, and pick a default behavior for the service if the client doesn't specify a preference. We could use the defined return=minimal for this; currently this is used in PUT/POST to say don't return results if they haven't changed, but are undefined for a GET operation in OData.

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