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fix(arrow/tensor): default nil dimension names to empty strings #999

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Merged
zeroshade merged 1 commit into from
Jul 27, 2026
+22 −0
Merged

fix(arrow/tensor): default nil dimension names to empty strings #999

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4 changes: 4 additions & 0 deletions arrow/tensor/tensor.go
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,10 @@ func New(data arrow.ArrayData, shape, strides []int64, names []string) Interface
}

func newTensor(dtype arrow.DataType, data arrow.ArrayData, shape, strides []int64, names []string) *tensorBase {
if names == nil {
names = make([]string, len(shape))
}

tb := tensorBase{
dtype: dtype,
bw: int64(dtype.(arrow.FixedWidthDataType).BitWidth()) / 8,
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18 changes: 18 additions & 0 deletions arrow/tensor/tensor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -164,3 +164,21 @@ func TestInvalidTensor(t *testing.T) {
})

}

func TestTensorWithNilDimensionNames(t *testing.T) {
bld := array.NewFloat64Builder(memory.DefaultAllocator)
defer bld.Release()
bld.AppendValues([]float64{1, 2}, nil)
arr := bld.NewFloat64Array()
defer arr.Release()

tsr := tensor.New(arr.Data(), []int64{2}, nil, nil)
defer tsr.Release()

if got, want := tsr.DimNames(), []string{""}; !reflect.DeepEqual(got, want) {
t.Fatalf("invalid dim-names: got=%v, want=%v", got, want)
}
if got := tsr.DimName(0); got != "" {
t.Fatalf("invalid dim-name[0]: got=%q, want empty string", got)
}
}
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