join_use_nulls = 1
1	1
2	2
-
1	1
-
1	1	1	1
-
1	1
2	2
-
1	1	1	1
2	2	\N	\N
-
1	1	1	1
2	2	\N	\N
-
1	1	1	1
-
2	2
-
2	2	\N	\N
-
\N	\N
-
1	1	\N	\N
2	2	\N	\N
-
1	1	1	1
2	2	\N	\N
-
join_use_nulls = 0
1	1
2	2
-
1	1
-
1	1	1	1
-
1	1
2	2
-
1	1	1	1
2	2	0	0
-
1	1	1	1
2	2	0	0
-
1	1	1	1
-
-
-
-
1	1	0	0
2	2	0	0
-
1	1	1	1
2	2	0	0
-