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IMPALA-11842 implement crude correlation factor calculation that simply include all grouping expression. This can be made more precise by excluding literal expression such as string literal or NULL literal that often comes up in ROLLUP query. Testing: - Pass TpcdsPlannerTest Change-Id: I4ffa9e82b83e7c0042bd918ac132668a47505688 Reviewed-on: http://gerrit.cloudera.org:8080/20194 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>