HIVE-1511

Summary: Hive Plan Serialization

Test Plan: Regression test suite

Reviewers: brock

Reviewed By: brock

Differential Revision: https://reviews.facebook.net/D12789

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1521110 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HIVE-4779-trunk-gd