Weston Pace created ARROW-16260:
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             Summary: [C++] Add backpressure to aggregate node
                 Key: ARROW-16260
                 URL: https://issues.apache.org/jira/browse/ARROW-16260
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace


There are two possible cases I can think of where we might need backpressure 
handling in aggregate node, though both are not a concern until we have 
spillover

* Once we have spillover we may want to pause the input while we are busy 
spilling to disk
* Once we have spillover we may want to pause reading from the spillover cache 
if the sink is busy



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