For each tuple, get the name of the first column which is non-zero

I have a table in Hive which looks like:

| Name | 1990 | 1991 | 1992 | 1993 | 1994 |
| Rex  | 0    | 0    | 1    | 1    | 1    |
| Max  | 0    | 0    | 0    | 0    | 1    |
| Phil | 1    | 1    | 1    | 1    | 1    |

I would like to get, for each row, the name of the first column which is non-zero, so something like:

| Name | Column |
| Rex  | 1992   |
| Max  | 1994   |
| Phil | 1990   |

For each row, it is guaranteed that: * There is at least one column with "1"; and * If column X has is "1", for each column Y > X, column Y will also have a "1".