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Marcel spotted that nested TPCH-Q18 can be expressed with more efficient SQL. Results on nested TPCH-300: Before 160s After 100s Change-Id: I8b351b7f467e8bef0c256dc43cea325d7f177edf Reviewed-on: http://gerrit.cloudera.org:8080/2418 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Internal Jenkins