Sailesh Mukil created IMPALA-7163:

             Summary: Implement a state machine for the QueryState class
                 Key: IMPALA-7163
             Project: IMPALA
          Issue Type: Improvement
            Reporter: Sailesh Mukil
            Assignee: Sailesh Mukil

We've recently been improving our query lifecycle by adding explicit state 
transitions so it's easier to reason about what should happen at a given stage 
in the lifetime of a query or a fragment instance.

On the coordinator side. The coordinator's view of the query:

On the fragment instance state side. A FIS's view of its own execution:

We don't have something like this for the QueryState class which maintains 
query wide state per executor. Adding it should make the lifecycle of a query 
from an executors point of view much easier to reason about.

Additional info: This was identified as part of work for IMPALA-2990, and is a 
precursor to it.

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