Joe McDonnell created IMPALA-13945:
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             Summary: Change the tuple cache key trace to display an individual 
node's contribution
                 Key: IMPALA-13945
                 URL: https://issues.apache.org/jira/browse/IMPALA-13945
             Project: IMPALA
          Issue Type: Task
          Components: Frontend
    Affects Versions: Impala 5.0.0
            Reporter: Joe McDonnell


As tuple caching is supported higher in the plan tree, the cache key trace can 
become enormous, as it includes all of its childrens' information plus its own 
contribution. An individual trace can take up over a hundred lines in the 
profile. It can be hard to determine which contribution comes from which child.

We should break up the hash trace and display each node's individual 
contribution to the hash trace. This should be smaller in the profile and more 
clearer display what is new at each level.



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