[OASIS Issue Tracker] Updated: (ODATA-576) Aggregation: Can we find a better way to represent nested expands?

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ http://tools.oasis-open.org/issues/browse/ODATA-576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-576:
-----------------------------

      Proposal: 
The mandatory first parameter for the expand path can be followed by either a filter() or an expand() transformation, after wich an arbitrary number of expand() expressions can optionally be passed:

    GET ~/Categories?$apply=expand(Products,filter(startswith(Name,'Ski'),expand(Sales,filter(Amount gt 1000)))

    GET ~/Categories?$apply=expand(Products,expand(Sales))

This is very close to the new V4 $expand syntax: 

    GET ~/Categories?$expand=Products($filter=startswith(Name,'Ski'),$expand=Sales($filter=Amount gt 1000))

and 

    GET ~/Categories?$expand=Products($expand=Sales)

  was:
After the two mandatory parameters for the expand path and filter expression an arbitrary number of arguments can be passed, each being an expand transformation:

    GET ~/Categories?$apply=expand(Products,startswith(Name,'Ski'),expand(Sales,Amount gt 1000))/... 

Just expanding without filtering can be achieved by supplying true as the second parameter: 
 
    GET ~/Categories?$apply=expand(Products,true,expand(Sales,true))/... 

This is very close to the new V4 $expand syntax: 

    GET ~/Categories?$expand=Products($filter=startswith(Name,'Ski'),$expand=Sales($filter=Amount gt 1000))&... 

and 

    GET ~/Categories?$expand=Products($expand=Sales)&... 

    Resolution:   (was: https://www.oasis-open.org/committees/download.php/51828/odata-data-aggregation-ext-v4.0-wd02-2013-12-20.docx)

> Aggregation: Can we find a better way to represent nested expands?
> ------------------------------------------------------------------
>
>                 Key: ODATA-576
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-576
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Extension for Data Aggregation 
>    Affects Versions: V4.0_CSD01
>         Environment: [Proposed][Applied]
>            Reporter: Michael Pizzo
>             Fix For: V4.0_CSD02
>
>
> The current aggregation specification use the old path syntax for nested expands. This is inconsistent with the new way to represent expands in core. Can we figure out a syntax for nested expands in aggregation that is consistent with core?

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