JuliaStats/DataFrames.jl — pull request #632 by hayd (2014-06-22 07:03:09+00:00)
Title: convert 2dim DataArray to multi-column DataFrame

Previously:
```
julia> @data([1 NA; 3 4; 5 6])
3x2 DataArray{Int64,2}:
1 NA
3 4
5 6

julia> convert(DataFrame, ans)
6x1 DataFrame
|-------|----|
| Row # | x1 |
| 1 | 1 |
| 2 | NA |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
```

I think it's expected that these should be converted to multiple columns:
```
julia> convert(DataFrame, ans)
2x3 DataFrame
|-------|----|----|----|
| Row # | x1 | x2 | x3 |
| 1 | 1 | 3 | 5 |
| 2 | NA | 4 | 6 |
```