examples/column_operations/output.txt
+------------+-------------+-------------+-------+--------+
| date | high | low | range | double |
+------------+-------------+-------------+-------+--------+
| 2015-03-11 | 2050.080078 | 2039.689941 | 10.39 | 21 |
| 2015-03-12 | 2066.409912 | 2041.099976 | 25.31 | 51 |
| 2015-03-13 | 2064.560059 | 2041.170044 | 23.39 | 47 |
| 2015-03-16 | 2081.409912 | 2055.350098 | 26.06 | 52 |
| 2015-03-17 | 2080.590088 | 2065.080078 | 15.51 | 31 |
| 2015-03-18 | 2106.850098 | 2061.22998 | 45.62 | 91 |
| 2015-03-19 | 2098.689941 | 2085.560059 | 13.13 | 26 |
| 2015-03-20 | 2113.919922 | 2090.320068 | 23.6 | 47 |
| 2015-03-23 | 2114.860107 | 2104.419922 | 10.44 | 21 |
| 2015-03-24 | 2107.629883 | 2091.5 | 16.13 | 32 |
+------------+-------------+-------------+-------+--------+