const column
2019-09-16 19:20:12.345	1568650812345	1568650812345000	1568650812345000000
2019-09-16 19:20:12.345678	1568650812345	1568650812345678	1568650812345678000
2019-09-16 19:20:12.345678910	1568650812345	1568650812345678	1568650812345678910
non-const column
2019-09-16 19:20:12.345	1568650812345	1568650812345000	1568650812345000000
2019-09-16 19:20:12.345678	1568650812345	1568650812345678	1568650812345678000
2019-09-16 19:20:12.345678910	1568650812345	1568650812345678	1568650812345678910