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an empty select-project-join block This commit fixes an issue where an aggregation expr may reference a non-materialized slot if the query contains an empty select-project-join block. This fix ensures that all the exprs in an aggregation reference materialized slots/tuples. Change-Id: Ic2cc9818061b3f06ab1d1cebf4e604352c2df6d1 Reviewed-on: http://gerrit.cloudera.org:8080/348 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com> Tested-by: Internal Jenkins