[OASIS Issue Tracker] (ODATA-968) 3.1.4: add example for from in aggregate() with multiple arguments

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Ralf Handl created ODATA-968:
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             Summary: 3.1.4: add example for from in aggregate() with multiple arguments
                 Key: ODATA-968
                 URL: https://issues.oasis-open.org/browse/ODATA-968
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Bug
          Components: OData Extension for Data Aggregation
    Affects Versions: V4.0_CSD03
            Reporter: Ralf Handl
             Fix For: V4.0_CSD04


Explain how in aggregate() with multiple arguments the "from" keyword can be resolved into a groupby/aggregate sequence by initially grouping by all "from" properties appearing in any argument.

Will probably work only if all "from" chains are compatible, i.e. there exists a "super-chain" so that any from chain is a sub-chain of this super-chain. 

1) from A from B from D,from A from C from D works with super-chain from A from B from C from D (B and C can be swapped to get another possible super-chain.

2) from A from B, from B from A won't work






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