2019-09-16 16:20:11.000	DateTime64(3, \'UTC\')
2019-09-16 19:20:11	DateTime64(0, \'UTC\')
2019-09-16 19:20:11.000	DateTime64(3, \'UTC\')
2019-09-16 19:20:11.000000000	DateTime64(9, \'UTC\')
non-const column
2019-09-16 19:20:11.000	DateTime64(3, \'UTC\')