[OASIS Issue Tracker] Updated: (ODATA-391) Add query function isdefined(PropertyPath) to determine whether an instance has a property of that name

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     [ http://tools.oasis-open.org/issues/browse/ODATA-391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-391:
-----------------------------

    Proposal: 
Add a canonical function 

    Edm.Boolean isdefined(Edm.PropertyyPath)

that returns true if the property identified by the path is defined on that instance.

Example:

    GET ~/Products?$filter=defined(Product/SecondaryColor)

Accepted: https://www.oasis-open.org/committees/download.php/49325/odata-meeting-38_on-20130523-minutes.html#odata-391

  was:
Add a canonical function 

    Edm.Boolean isdefined(Edm.PropertyyPath)

that returns true if the property identified by the path is defined on that instance.

Example:

    GET ~/Products?$filter=defined(Product/SecondaryColor)




> Add query function isdefined(PropertyPath) to determine whether an instance has a property of that name
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ODATA-391
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-391
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Extension for Data Aggregation 
>    Affects Versions: V4.0_WD01
>         Environment: [Proposed]
>            Reporter: Ralf Handl
>             Fix For: V4.0_WD01
>
>
> We allow clients to add dynamic/undeclared properties to instances of open types, but we can't express filter conditions on the existence of a property of that name.
> This is also useful in the context of data aggregation to determine if a property has been "aggregated away". Here the extension will define that defined(...) returns false even for declared properties if they are not defined on an entity of the result set as an effect of groupby(), rollup(), or aggregate().

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