mspruc opened a new pull request, #591:
URL: https://github.com/apache/incubator-wayang/pull/591

   We are still missing some features to completely handle TPC-H
   
   - Tree algebra for projections & joins
   Sometimes you can have nested statements in joins e.g. if you have =($x, 
or($y,$z)), we need to be able to unpack this.
   - Sub-queries
   for now I have added sub-query remove rule from Calcite, however this 
doesn't handle all sub-query cases, especially if the sub-query is nested
   
   
   


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