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Here is a concrete example of the general case rewriting (optimizerts/queries/nested_loj4.aql). 

Before plan:

distribute result [%0->$$13] -- |UNPARTITIONED|

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Here is a concrete example (optimizerts/queries/nested_loj2.aql). .

Before plan (nested_loj2):

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          empty-tuple-source -- |UNPARTITIONED|

After plan:

distribute result [%0->$$17] -- |UNPARTITIONED|

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