TAJO-554: LogicalPlanner should allow additional expressions with asterisk in select list. (jihoon)
TAJO-598: Refactoring Tajo RPC. (jinho)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into TAJO-595_CC

Conflicts:
	tajo-core/tajo-core-backend/src/test/java/org/apache/tajo/engine/query/TestSelectQuery.java
	tajo-core/tajo-core-backend/src/test/resources/queries/TestSelectQuery/testSelectAsterisk4.sql
	tajo-core/tajo-core-backend/src/test/resources/results/TestSelectQuery/testSelectAsterisk4.result
renamed field to column.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into TAJO-595_CC
Renamed.
added some comments.