DRILL-75 and DRILL-76
Adding parquet repository to project root POM.xml file.

Signed-off-by: Jacques Nadeau <jacques@apache.org>
Add sqlline launcher script.

Signed-off-by: Jacques Nadeau <jacques@apache.org>
Added support for the 'constant' operator, necessary to implement the SQL values operator.

Signed-off-by: Jacques Nadeau <jacques@apache.org>
Added Visitor for logical plan graph and accompanying accept methods in each of the LogicalOperator classes. Created basic optimizer for logical to physical plan coversion.

Signed-off-by: Jacques Nadeau <jacques@apache.org>
Merge branch 'master' into execwork.  Fix conflicts.

Conflicts:
	sandbox/prototype/common/src/test/resources/logback.xml
	sandbox/prototype/pom.xml
Added JSONScanPOP and JSONScanBatch