Generation of rudimentary distributed plans for analytic exprs.

Change-Id: I14038a34371ccf74a1e2d174203f7a5898a31819
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4034
Reviewed-by: Marcel Kornacker <marcel@cloudera.com>
Tested-by: jenkins
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4050