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Subject: [OASIS Issue Tracker] Commented: (ODATA-165) Support Cross-joins

    [ http://tools.oasis-open.org/issues/browse/ODATA-165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32761#action_32761 ] 

Ralf Handl commented on ODATA-165:

I like the proposal if we make it an optional part of V4. Only service backed by a sophisticated query processor will be able to respond to this kind of request.

> Support Cross-joins
> -------------------
>                 Key: ODATA-165
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-165
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: OData Protocol 
>            Reporter: Michael Pizzo
>            Assignee: Michael Pizzo
> We often have requests to support queries that span entitysets. Where navigation properties exist between the entitysets these provide a natural and convenient mechanism for building queries that span entitysets. However, where navigation properties are not present a way is needed to build such cross-entity spanning queries.
> In the context of looking at aggregation we came up with a solution for doing this by considering the entitycontainer as the cross-product of the contained entitysets. You could then $expand the entitysets you wanted to join, and add a filter to specify the equivalent of the join condition. This seemed generally useful beyond just the scope of aggregation.

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