[OASIS Issue Tracker] (ODATA-1186) Clarify names that can appear in annotation of term ApplySupported/Transformations

Gerald Krause created ODATA-1186:
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             Summary: Clarify names that can appear in annotation of term ApplySupported/Transformations
                 Key: ODATA-1186
                 URL: https://issues.oasis-open.org/browse/ODATA-1186
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: Extension for Data Aggregation
    Affects Versions: V4.0_CSD03
         Environment: Proposed
            Reporter: Gerald Krause
             Fix For: V4.0_CSD04


Currently, nest can be used to create an entity with a single containment navigation property holding the result of a transformation sequence:

{{nest( cnp, t )}} returns
{code}
{ <cnp>: [ <result of t applied to input set> ] }{code}
There are use cases to generalize this and nest the results of _multiple_ transformation sequences at once. Consider, for example, a request to combine the results of two transformations in a single response. Using transformation concat requires an extra computation of a concat index to relate an entity in the result to the corresponding concat argument (see ODATA-1138):

{{GET ~/Sales?$apply=concat(}}
{{   filter(<complex expression 1>)}}
{{   }}{{/groupby((Customer),aggregate(Amount with sum as Total))/compute(1 as concat_index),}}
{{   filter(<complex expression 2>)}}
{{   /groupby((Customer),aggregate(Amount with sum as Total))/compute(2 as concat_index))}}

 

If it makes sense to keep the results of the two transformations separately, they could be retrieved via an extended syntax of the transformation nest:

{{GET ~/Sales?$apply=nest(}}
{{   filter(<complex expression 1>)}}
{{   /groupby((Customer),aggregate(Amount with sum as Total)) as part_1,}}
{{   filter(<complex expression 2>)}}
{{   /groupby((Customer),aggregate(Amount with sum as Total)) as part_2)}}

 



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