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This follows up on a TODO from the Kudu merge and also fixes a bug: IMPALA-976 changed the computation of selectivities for a combined list of conjuncts to better handle expressions with no selectivity estimate. The Kudu implementation was forked from before this change and thus did not have an equivalent change. This refactors the algorithm to a new static method and calls it from both PlanNode and KuduScanNode so that the selectivity estimate behavior is the same regardless of whether Kudu can evaluate the predicate server-side. Todd tested this on TPCH 3TB and verified that the plans are reasonable now where they used to be nonsense. Change-Id: Id507077b577ed5804fc80517f33ea185f2bff41a Reviewed-on: http://gerrit.cloudera.org:8080/2628 Reviewed-by: Casey Ching <casey@cloudera.com> Tested-by: Internal Jenkins