jacques-n commented on pull request #10934:
URL: https://github.com/apache/arrow/pull/10934#issuecomment-906810077


   Additional comments: given this interest in targeting physical engines, it 
is weird that we are missing common physical operations like HashJoin, 
MergeJoin, HashAggregate, StreamingAggregate, TopN (order + limit operator), as 
well as a bunch related to RedistributeSend, OrderedRedistribute, 
UnorderedReception, OrderedReception, etc. 
   
   I also think we need to go to each operation and declare the following:
   - Properties each operation maintains. (e.g. if you have Read > Sort > 
Filter > Write, is the write expected to be sorted?)
   - The order of the output fields/columns. For example, Join (A, B), 
Project(a+b, c+d), etc.
   


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