[OASIS Issue Tracker] Created: (ODATA-239) Allowing expressions to be passed as parameters to (super) functions

Allowing expressions to be passed as parameters to (super) functions
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                 Key: ODATA-239
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-239
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: New Feature
          Components: OData CSDL v1.0
    Affects Versions: WD01
            Reporter: Hubert Heijkers


To be able to use/extend the set of functions that can be used in a $apply query option functions need parameters of type (lambda) expression, which expression can then be applied to each and every instance in the set they are processing. 
An very simple example of such a function would:

$apply=GroupBy()/TopN( 5, Revenue )

Where 5 is just a number indicating the top N we are interested in but were 'Revenue' is actually an expression refering to the Revenue property of the entity in the set the function is acting upon. A better example in which this becomes more apparent would be:

$apply=GroupBy()/TopN( 5, Revenue - Cost )

For build in functions we can obviously simply define this but currently there is no way of defining a 'custom' function that could implement the same behavior because we can't pass in expressions.


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