Summation of ConstantArray of 0 with vector of 0's fails

DelayedArray::ConstantArray と HDF5Array::writeHDF5Array のエントリポイントから開始してゼロ値のケースを再現し、その後、レポートに示されている動作する組み合わせと比較します。ゼロの ConstantArray とゼロベクトルを正常に書き込めること、および既存の例が回帰チェックとして機能することを確認できれば完了です。

Hi,

I ran into a curious edge case, where summing a ConstantArray with a vector fails if both are zero and then writing it with HDF5Array::writeHDF5Array, but not in any other combination:

mat <- DelayedArray::ConstantArray(c(2, 4), value = 0)
res <- mat + rep(0, 2)
res
#> <2 x 4> sparse DelayedMatrix object of type "double":
#>      [,1] [,2] [,3] [,4]
#> [1,]    0    0    0    0
#> [2,]    0    0    0    0
HDF5Array::writeHDF5Array(res)
#> Error in .Arith_SVT1_v2(.Generic, e1, e2): "+" is not supported between a SparseArray object and a numeric vector
#>   (result wouldn't be sparse in general)

# All other combination seems to work
mat <- DelayedArray::ConstantArray(c(2, 4), value = 0)
res <- mat + rep(3, 2)
HDF5Array::writeHDF5Array(res)
#> <2 x 4> HDF5Matrix object of type "double":
#>      [,1] [,2] [,3] [,4]
#> [1,]    3    3    3    3
#> [2,]    3    3    3    3

mat <- DelayedArray::ConstantArray(c(2, 4), value = 17)
res <- mat + rep(0, 2)
HDF5Array::writeHDF5Array(res)
#> <2 x 4> HDF5Matrix object of type "double":
#>      [,1] [,2] [,3] [,4]
#> [1,]   17   17   17   17
#> [2,]   17   17   17   17

mat <- DelayedArray::ConstantArray(c(2, 4), value = 0)
res <- mat + 0
HDF5Array::writeHDF5Array(res)
#> <2 x 4> sparse HDF5Matrix object of type "double":
#>      [,1] [,2] [,3] [,4]
#> [1,]    0    0    0    0
#> [2,]    0    0    0    0

^{Created on 2025-03-05 with reprex v2.1.1}

I am not actually 100% this is an DelayedArray issue or if it might rather need to be moved to HDF5Array.

Best,
Constantin