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Fixed cost estimation of union queries and exchange nodes. Fixed propagation of stats through cloning of exprs and plan nodes. Fixed propagation of expr stats to slots they are materialized into (e.g., grouping columns in multi-level aggs). Improved explain output for constant selects. Change-Id: I96d1652c00d48e4093b85ae7fc8bad28d74b8b81 Reviewed-on: http://gerrit.ent.cloudera.com:8080/547 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Alex Behm <alex.behm@cloudera.com>