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src/a/n/anapsid-HEAD/ANAPSID/Planner/Plan.py   anapsid(Download)
from ANAPSID.NonBlockingOperators.NestedHashJoinFilter import NestedHashJoinFilter as NestedHashJoin
#from ANAPSID.NonBlockingOperators.NestedHashOptional import NestedHashOptional
from ANAPSID.NonBlockingOperators.NestedHashOptionalFilter import NestedHashOptionalFilter as NestedHashOptional
from ANAPSID.BlockingOperators.HashJoin import HashJoin
from ANAPSID.BlockingOperators.HashOptional import HashOptional
            # Case 1: left operator is highly selective and right operator is low selective
            if not(lowSelectivityLeft) and lowSelectivityRight and not(isinstance(right, TreePlan)):
                l = TreePlan(NestedHashOptional(left.vars, right.vars), all_variables, l, right)
                dependent_op = True
                #print "Planner CASE 1: nested optional"
 
            # Case 2: left operator is low selective and right operator is highly selective
            elif lowSelectivityLeft and not(lowSelectivityRight) and not(isinstance(right, TreePlan)):
                l = TreePlan(NestedHashOptional(left.vars, right.vars), all_variables, right, l)
                #print "Planner CASE 2: nested loop optional swapping plan"
            elif not(lowSelectivityLeft) and lowSelectivityRight  and not(isinstance(left, TreePlan) and (left.operator.__class__.__name__ == "NestedHashJoin" or left.operator.__class__.__name__ == "Xgjoin")) and not(isinstance(right,IndependentOperator)) and not(right.operator.__class__.__name__ == "NestedHashJoin" or right.operator.__class__.__name__ == "Xgjoin") and  (right.operator.__class__.__name__ == "Xunion"):
                l = TreePlan(NestedHashOptional(left.vars, right.vars), all_variables, l, right)
                dependent_op = True
            # Case 3: both operators are low selective