At the moment we use select(t, All()) to select everything, and select(t, All(args...)) to select the union of the selectors in args. This is a bit inconsistent, as the empty union is empty, which is not what All() does.
The fix recommended in https://github.com/JuliaData/DataAPI.jl/issues/27 is use : to mean everything, and to replace All(args...) with Cols(args...), which now always means the union. Thus, IIUC, as selectors, Cols(:) == : == All().
This issue is to see whether there are concerns about supporting : as a selector to replace All(). My only concern is that select(t, :) and select(t, 1:3) would do very different things (the latter returns 1:3), but it is IMO not a deal breaker.
At the moment we use
select(t, All())to select everything, andselect(t, All(args...))to select the union of the selectors inargs. This is a bit inconsistent, as the empty union is empty, which is not whatAll()does.The fix recommended in https://github.com/JuliaData/DataAPI.jl/issues/27 is use
:to mean everything, and to replaceAll(args...)withCols(args...), which now always means the union. Thus, IIUC, as selectors,Cols(:) == : == All().This issue is to see whether there are concerns about supporting
:as a selector to replaceAll(). My only concern is thatselect(t, :)andselect(t, 1:3)would do very different things (the latter returns1:3), but it is IMO not a deal breaker.