[OASIS Issue Tracker] Commented: (ODATA-36) Make $expand implicit if navigation properties are mentioned in $select or $aggregate

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    [ http://tools.oasis-open.org/issues/browse/ODATA-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31257#action_31257 ] 

Michael Pizzo commented on ODATA-36:
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I propose that we don't do this.

$expand and $select are different parts of the query, handled and evaluated at different points in time (similar to FROM and SELECT clauses in SQL).

$expand is evaluated before $select and identifies the full set of entities available to the client. Once that full set of data is defined, $select allows the client to select the properties of those entities that are of interest from that set of data.

We are looking at extending $expand to include things like filtering and sorting of the related entities. I would not like to introduce complexity by saying that $expand is used in some case (i.e., where filtering/sorting of related entities is required) but not used in other cases.

> Make $expand implicit if navigation properties are mentioned in $select or $aggregate
> -------------------------------------------------------------------------------------
>
>                 Key: ODATA-36
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-36
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Protocol v1.0, OData URL Conventions v1.0
>    Affects Versions: WD01
>            Reporter: Martin Zurmuehl
>            Priority: Minor
>             Fix For: WD01
>
>
> Currently clients need to repeat themselves when projecting on expanded entities:
> GET http://services.odata.org/OData/OData.svc/Products?$select=*,Category/Name&$expand=Category
> This could be reduced to 
> GET http://services.odata.org/OData/OData.svc/Products?$select=*,Category/Name
> because the client explicitly requests Category/Name, and the server can only satisfy that if it expands the Category.

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