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Subject: [OASIS Issue Tracker] Commented: (ODATA-132) Support /$count in $select, $filter and $orderby

    [ http://tools.oasis-open.org/issues/browse/ODATA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31516#action_31516 ] 

Michael Pizzo commented on ODATA-132:

If we support $count in $select we need to specify how the count is returned. For example, for ATOM, is it returned as a property, a new property, an instance annotation, or using the <m:count> element. Adding it as a property has issues with the result no longer matching the type defined in metadata (which would not have count defined). Similarly for JSON, is it returned as a property, in a __metadata property, as __count, or through an instance annotation?

This should also be considered in conjunction with incoming aggregation proposal, as $count is a type of aggregation on the collection, and it's unclear without understanding the broader proposal whether $count should be handled differently from other aggregations.

> Support /$count in $select, $filter and $orderby
> ------------------------------------------------
>                 Key: ODATA-132
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-132
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData ABNF Construction Rules v1.0, OData ATOM Format v1.0, OData JSON Format v1.0, OData Protocol v1.0, OData URL Conventions v1.0
>    Affects Versions: WD01
>         Environment: [Proposed]
>            Reporter: Michael Pizzo
>            Assignee: Michael Pizzo
>            Priority: Minor
>             Fix For: WD01
> ODATA-114 added suppport for /$count to collection valued properties.
> This issue tracks supporting /$count in $select, $filter and $orderby. For example, we could support:
>     GET ~/Friends?$filter=Interests/$count gt 10&$orderby=Interests/$count 
> for either collection properties or navigations, or
>     GET ~/Friends?$expand=Interests&$select=*,Interests/$count
> The second example uses the same representation for the count in the inlined entity set as is used for representing the count of the base set in queries using $inlinecount=allpages.

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