More decimal overflow fixes.

Change-Id: I77a7047a37e8aed9d5709a764bfe0ad94f05205c
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3090
Reviewed-by: Nong Li <nong@cloudera.com>
Tested-by: jenkins
Changes to row-batch.cc and Data.thrift interface.

This change will allow row-batch.cc to use LZ4 codec.
It will be implemented in a following patch.

Change-Id: I9302da1b72c83fcf8420724138d40ad0d82c554b
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3030
Reviewed-by: Paden Tomasello <paden.tomasello@cloudera.com>
Tested-by: jenkins
Fix misleading test to unblock full data loading.

Change-Id: I98c218188a0cf459cacb96363e7a65ebb4525f07
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3099
Reviewed-by: Nong Li <nong@cloudera.com>
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Alex Behm <alex.behm@cloudera.com>