zinfo(z) fails when no chunks of z are initialized #197
Description
The output of something like z = zcreate(Int64, 5, chunks=(1,), path="test.zarr") produces an error if you run zinfo(z)
ERROR: ArgumentError: reducing over an empty collection is not allowed; consider supplying `init` to the reducer
Stacktrace:
[1] _empty_reduce_error()
@ Base ./reduce.jl:319
[2] mapreduce_empty(f::Function, op::Function, T::Type)
@ Base ./reduce.jl:321
[3] reduce_empty(op::Base.MappingRF{Zarr.var"#17#19"{DirectoryStore, String}, typeof(Base.add_sum)}, ::Type{String})
@ Base ./reduce.jl:358
[4] reduce_empty_iter
@ ./reduce.jl:381 [inlined]
[5] mapreduce_empty_iter(f::Function, op::Function, itr::Vector{String}, ItrEltype::Base.HasEltype)
@ Base ./reduce.jl:377
[6] _mapreduce(f::Zarr.var"#17#19"{DirectoryStore, String}, op::typeof(Base.add_sum), ::IndexLinear, A::Vector{String})
@ Base ./reduce.jl:429
[7] _mapreduce_dim
@ ./reducedim.jl:337 [inlined]
[8] mapreduce
@ ./reducedim.jl:329 [inlined]
[9] _sum
@ ./reducedim.jl:987 [inlined]
[10] sum
@ ./reducedim.jl:983 [inlined]
[11] storagesize(d::DirectoryStore, p::String)
@ Zarr ~/Documents/GitHub/Zarr.jl/src/Storage/directorystore.jl:38
[12] storagesize
@ ~/Documents/GitHub/Zarr.jl/src/ZArray.jl:71 [inlined]
[13] zinfo(io::Base.TTY, z::ZArray{Int64, 1, Zarr.BloscCompressor, DirectoryStore})
@ Zarr ~/Documents/GitHub/Zarr.jl/src/ZArray.jl:91
[14] zinfo(z::ZArray{Int64, 1, Zarr.BloscCompressor, DirectoryStore})
@ Zarr ~/Documents/GitHub/Zarr.jl/src/ZArray.jl:86
[15] top-level scope
@ REPL[7]:1
Due to the implementation of storagesize(d::DirectoryStore,p). This could be fixed by using reduce instead of sum to give an explicit init value of 0. The issue is not present with the DictStore version:
julia> zinfo(zcreate(Int64, 5, chunks=(1,)))
Type : ZArray
Data type : Int64
Shape : (5,)
Chunk Shape : (1,)
Order : C
Read-Only : false
Compressor : Zarr.BloscCompressor(0, 5, "lz4", 1)
Filters : nothing
Store type : Dictionary Storage
No. bytes : 40
No. bytes stored : 0
Storage ratio : Inf
Chunks initialized : 0/5