IMPALA-1027 - Fix overflow in row count summary returned by CTAS
IMPALA-1027 - Fix overflow in row count summary returned by CTAS

Change-Id: I1a538d4deec92db6a95166a081106f07e0787c1e
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2849
Reviewed-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>
Tested-by: jenkins

cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala