TAJO-488: Data fetcher doesn't close small file in shuffle. (jinho)
TAJO-485: 'CREATE TABLE AS' does not work properly with partition. (jinho)
Added projection push down first version.
Add sort unit tests. Fixed many projection bugs.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into LogicalPlanRefactor
Before refactoring groupby.
Fixed unit tests.
Fixed unit tests.