random_page_cost	(100000,200000,3000), index for dep_a	(310000,200000,3000), index for dep_a	(360000,200000,3000), index for dep_a	(370000,200000,3000), index for dep_a	(1000000,200000,3000), index for dep_a	(1100000,200000,3000), index for dep_a
4	slow(HashJoin)	slow(HashJoin)	slow(HashJoin)	medium(MergeJoin)	medium(MergeJoin)	(MergeJoin)
3	slow(HashJoin)	slow(HashJoin)	medium(MergeJoin)	medium(MergeJoin)	medium(MergeJoin)	(MergeJoin)
2	slow(HashJoin)	medium(MergeJoin)	medium(MergeJoin)	medium(MergeJoin)	medium(MergeJoin)	(MergeJoin)
1	fast(nestloop)	fast(nestloop)	fast(nestloop)	fast(nestloop)	fast(nestloop)	(MergeJoin)
	(100000,200000,3200), index for dep_a	(200000,200000,3000), index for dep_a	(360000,200000,5000), index for dep_a			
4	same(HashJoin)	slow(HashJoin)	slow(HashJoin)			
3	same(HashJoin)	slow(HashJoin)	medium(MergeJoin)			
2	same(HashJoin)	slow(HashJoin)	medium(MergeJoin)			
1	same(HashJoin)	fast(nestloop)	fast(nestloop)			
			(360000,200000,6000), index for dep_a			
			(HashJoin)			
			(MergeJoin)			
			(MergeJoin)			
			(MergeJoin)