[OASIS Issue Tracker] (ODATA-1179) Enhance orderby $apply-transformation with sorting of undefined properties

Gerald Krause created ODATA-1179:
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             Summary: Enhance orderby $apply-transformation with sorting of undefined properties
                 Key: ODATA-1179
                 URL: https://issues.oasis-open.org/browse/ODATA-1179
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: New Feature
          Components: Extension for Data Aggregation
    Affects Versions: V4.0_CSD03
         Environment: Proposed
            Reporter: Gerald Krause
             Fix For: V4.0_CSD04


Transformation concat allows to create result sets from the output sets of two or more transformation sequences passed to concat as arguments. 

If entities of just one of these sequences shall be sorted, or the output sets shall be sorted differently, this cannot be achieved with the system query option $orderby, which always operates on the entire set produced by $apply.

This leads to the requirement for a dedicated orderby transformation. Known use cases include grid-like access to aggregated data, which is described in more detail in this separate document (https://www.oasis-open.org/committees/document.php?document_id=62593&wg_abbrev=odata), and paging inside transformation sequences (addressed in https://issues.oasis-open.org/browse/ODATA-1158 ).




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