This continues some of the discussion in #53, esp. #53 (comment). See also JuliaArrays/StructArrays.jl#241 for a PR to use this package in StructArrays.
In StructArrays one generally needs to figure out a type not from fieldvalues (which ConstructionBase can deal with) but from arrays of field values. For example, starting from the type Pair and the columns [1, 2, 3], ["a", "b", 2], I would like to figure out that the eltype for the resulting StructArray (which should be Pair{Int, Any}). Could ConstructionBase be extended to support something like this?
There is a second issue in this example. In this Pair{Int, Any} scenario, the default constructorof would "lie" about the element type. In other words:
julia> constructorof(Pair{Int, Any})(1, "a") isa Pair{Int, Any}
falseWould it be feasible to add a version of constructorof that respects the type parameters? Ideally, that would also address #58 as well as other problematic types (such as types with inner constructors).
This continues some of the discussion in #53, esp. #53 (comment). See also JuliaArrays/StructArrays.jl#241 for a PR to use this package in StructArrays.
In StructArrays one generally needs to figure out a type not from fieldvalues (which ConstructionBase can deal with) but from arrays of field values. For example, starting from the type
Pairand the columns[1, 2, 3],["a", "b", 2], I would like to figure out that theeltypefor the resultingStructArray(which should bePair{Int, Any}). Could ConstructionBase be extended to support something like this?There is a second issue in this example. In this
Pair{Int, Any}scenario, the defaultconstructorofwould "lie" about the element type. In other words:Would it be feasible to add a version of
constructorofthat respects the type parameters? Ideally, that would also address #58 as well as other problematic types (such as types with inner constructors).