fix the isseue with grouping match
added average aggregation column
changes to support avg for group by columns match
added the changes for average
removed the avg changes
average table scan optimization
fix UTs
fix UTs
add UTs
added UTs
fix UTs
added UT
added UTs
changed the UTs
edited UTs
edited UTs
added the session startree false in UTs
changes for group by match prior to cube scan node
avg aggregator source symbol changes
segregated the unit tests
checkstyle fixes
changes for Unit Tests, lineitem table replace the nation table
UTs are divided into smaller methods
added documentation comments for test method
changed the UT tests
changes for group match
updated hetu-docs
edits the create cubes of the UTs
fixes for avg aggregation
fix uts
1. Block INSERT INTO CUBE if source table has been updated.
2. Block duplicate data insert into the cube
3. Insert entire data from source table into cube
4. Updated hetu docs
Debasatwa Dutta