/test-data/column_join_in12.pileup

 10610009D07Rik	4	2.00	2.00	2.54	12/12	2	1
 20610010K14Rik	1	1.41	1.41	0.96	6/12	1	1
 31110002N22Rik	2	1.70	1.70	-0.06	10/12	2	1
 41110008L16Rik	6	2.45	2.45	0.68	12/12	2	1
 51110037F02Rik	1	2.45	2.45	2.13	2/12	1	1
 61190005F20Rik	4	2.18	2.18	0.28	11/12	2	1
 7Acot8	1	2.00	2.00	0.07	6/12	2	1
 8Acta1	2	1.54	1.54	0.63	11/12	2	1
 9Actb	2	1.89	1.89	1.35	9/12	2	1
10Actl6b	1	6.00	6.00	2.13	2/12	2	1
11Bend3	1	1.15	1.33	-0.51	9/12	1	1.33
12Bend5	1	3.46	3.46	3.17	1/12	1	1
13Brip1	2	1.73	1.73	0.58	8/12	1	1
14Btf3;Gm3531	1	4.00	4.00	1.67	3/12	2	1
15Bub3	1	1.33	1.33	-0.09	9/12	2	1
16C130039O16Rik	1	2.45	2.45	2.13	2/12	1	1
17C1d	1	1.73	1.73	0.87	4/12	1	1
18Caprin1	2	2.42	2.42	0.51	7/12	2	1
19Cbx3	2	1.54	1.54	0.75	11/12	2	1
20Eed	1	1.10	1.10	-0.47	10/12	1	1
21Efha1	1	3.46	3.46	3.17	1/12	1	1
22Exosc1	3	1.73	1.73	1.29	12/12	2	1
23Exosc10	25	5.00	5.00	1.03	12/12	2	1
24Gm189	2	1.70	1.70	2.12	10/12	2	1
25Gm3200	1	2.45	2.45	2.13	2/12	1	1
26Gm9855;Tdg	2	1.70	1.70	1.37	10/12	2	1
27Sfrs11	4	2.00	2.00	2.54	12/12	2	1
28Sfrs12	2	5.66	5.66	2.57	3/12	2	1
29Sin3a	1	1.31	1.31	-0.12	7/12	1	1
30Sirt7	1	2.00	2.00	1.67	3/12	1	1
31Skiv2l2	34	5.83	5.83	0.68	12/12	2	1
32Tubb2b	3	1.73	1.73	-0.10	12/12	2	1
33Tubb4	1	1.15	1.15	0.29	9/12	1	1
34Zscan4-ps2	1	12.00	12.00	3.17	1/12	2	1
35Zscan4e	2	2.83	2.83	2.12	6/12	2	1
36Zscan4f	2	1.70	1.70	1.00	10/12	2	1