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Prior to this change, the planner also considered coordinator-only nodes as executors while estimating the number of scan nodes to be used in the distributed plan. This change ensures that only executor nodes are considered for that estimation. Testing: Added a new custom cluster test to verify the same. Change-Id: I44af6b40099a495e13a0a5dc72c491d486d23aa8 Reviewed-on: http://gerrit.cloudera.org:8080/10873 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>