Merge pull request #480 from JuliaDataCubes/fg/skip_vars

Add option to skip keys when opening datasets

src/DatasetAPI/Datasets.jl

@@ -392,7 +392,8 @@ function open_mfdataset(vec::DD.DimVector{<:AbstractString};kwargs...)
     alldatasets = open_dataset.(vec;kwargs...);
     fi = first(alldatasets)
     mergedim = DD.dims(alldatasets) |> only
-    ars = map(collect(keys(fi.cubes))) do var
+    vars_to_merge = collect(keys(fi.cubes))
+    ars = map(vars_to_merge) do var
         cfi = fi.cubes[var]
         mergedar = if DD.dims(cfi,mergedim) !== nothing
             merge_existing_axis(alldatasets,cfi,var,mergedim) 
@@ -411,14 +412,16 @@ end
 Open the dataset at `g` with the given `driver`.
 The default driver will search for available drivers and tries to detect the useable driver from the filename extension.
 """
-function open_dataset(g; driver = :all)
+function open_dataset(g; skip_keys=(), driver = :all)
+    str_skipkeys = string.(skip_keys)
     dsopen = YAXArrayBase.to_dataset(g, driver = driver)
     YAXArrayBase.open_dataset_handle(dsopen) do g 
         isempty(get_varnames(g)) && throw(ArgumentError("Group does not contain datasets."))
         dimlist = collectdims(g)
         dnames = string.(keys(dimlist))
         varlist = filter(get_varnames(g)) do vn
             upname = uppercase(vn)
+            !in(vn, str_skipkeys) &&
             !occursin("BNDS", upname) &&
             !occursin("BOUNDS", upname) &&
             !any(i -> isequal(upname, uppercase(i)), dnames)

test/Datasets/datasets.jl

@@ -413,6 +413,12 @@ end
     @test ds2.c.data[:, :] == ds.c.data
     @test ds2.c.chunks == DiskArrays.GridChunks(size(a), (5, 10))
 
+    #Test if skip_keys works
+    ds3 = open_dataset(f, driver=:zarr, skip_keys = (:c,))
+    @test :a in keys(ds3.cubes)
+    @test :b in keys(ds3.cubes)
+    @test !in(:c,keys(ds3.cubes))
+
 end
 
 @testset "Saving, OutDims" begin