Originally posted by **Ossifragus** January 26, 2022
The relative order of the loaded columns seem to be always the same of the relative order the whole data (Is the order specified in the metadata?). For example with a `data` consisting two columns `"col1"` and `"col2"`, the code `JDF.load(data; cols = ["col1", "col2"])` loads the data correctly, but with `JDF.load(data; cols = ["col2", "col1"])` the data columns and their names would not match.
Please see the following example:
```julia
using RDatasets, JDF, DataFrames
JDF.save("iris.jdf", dataset("datasets", "iris"))
a = DataFrame(JDF.load("iris.jdf"))
c1 = ["Species", "PetalWidth"]
a1 = DataFrame(JDF.load("iris.jdf"; cols = c1)) # column mis-match
julia> first(a1, 5)
5×2 DataFrame
Row │ Species PetalWidth
│ Float64 Cat…
─────┼─────────────────────
1 │ 0.2 setosa
2 │ 0.2 setosa
3 │ 0.2 setosa
4 │ 0.2 setosa
5 │ 0.2 setosa
c2 = ["PetalWidth", "Species"]
a2 = DataFrame(JDF.load("iris.jdf"; cols = c2)) # column match
julia> first(a2, 5)
5×2 DataFrame
Row │ PetalWidth Species
│ Float64 Cat…
─────┼─────────────────────
1 │ 0.2 setosa
2 │ 0.2 setosa
3 │ 0.2 setosa
4 │ 0.2 setosa
5 │ 0.2 setosa
```
Discussed in https://github.com/xiaodaigh/JDF.jl/discussions/78