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sparseconvert: copy falls back to copymutable for non-sparse SubArray #32249

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8 changes: 7 additions & 1 deletion stdlib/SparseArrays/src/sparseconvert.jl
Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,13 @@ unwrap(A::Any) = A
unwrap(A::AbstractMatrix) = iswrsparse(A) ? convert(SparseMatrixCSC, A) : convert(Array, A)

import Base.copy
copy(A::SubArray{T,2}) where T = getindex(unwrap(parent(A)), A.indices...)
function copy(A::SubArray{T,2,P}) where {T,P}
if iswrsparse(P)
getindex(unwrap(parent(A)), A.indices...)
else
Base.copymutable(A)
end
end

# For pure sparse matrices and vectors return A.
# For wrapped sparse matrices or vectors convert to SparseMatrixCSC.
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