Signed-off-by: tianyuli <tli@wpi.edu>
Merge branch 'task2' of github.com:buzouxun/SimpleDB_2.10 into task2
Signed-off-by: tianyuli <tli@wpi.edu>
Merge branch 'task2' of github.com:buzouxun/SimpleDB_2.10 into task2
Basic implementation of task2, not tested yet

Signed-off-by: tianyuli <tli@wpi.edu>