Support Parquet fileformat for data-generator when running against Hive
Support Parquet fileformat for data-generator when running against Hive

Also add DDL logging to facilitate debugging.

Change-Id: If7600677ed8c491b68468cae4ddf5394499576ca
Reviewed-on: http://gerrit.cloudera.org:8080/688
Reviewed-by: Casey Ching <77bc9a9984e6786c5799d7a71768cf023120ef76@cloudera.com>
Tested-by: Internal Jenkins

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