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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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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