Navis created HIVE-4397:
---------------------------

             Summary: Show stage dependency as a tree
                 Key: HIVE-4397
                 URL: https://issues.apache.org/jira/browse/HIVE-4397
             Project: Hive
          Issue Type: Improvement
          Components: Diagnosability
            Reporter: Navis
            Assignee: Navis
            Priority: Trivial


HIVE-4258 logs logical plan. Tried same thing to tasks.

For auto_join31.q

{noformat}
STAGE DEPENDENCIES:
  Stage-1 is a root stage
  Stage-8 depends on stages: Stage-1, Stage-4, Stage-5 , consists of Stage-9, 
Stage-10, Stage-2
  Stage-9 has a backup stage: Stage-2
  Stage-6 depends on stages: Stage-9
  Stage-3 depends on stages: Stage-2, Stage-6, Stage-7
  Stage-10 has a backup stage: Stage-2
  Stage-7 depends on stages: Stage-10
  Stage-2
  Stage-4 is a root stage
  Stage-5 is a root stage
  Stage-0 is a root stage

STAGE GRAPH:
  Stage-1-Stage-8-Stage-9-Stage-2-Stage-3
                         -Stage-6-Stage-3
                 -Stage-10-Stage-2
                          -Stage-7-Stage-3
                 -Stage-2
  Stage-4-Stage-8
  Stage-5-Stage-8
  Stage-0
{noformat}

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