adamreeve opened a new issue, #41164:
URL: https://github.com/apache/arrow/issues/41164
### Describe the bug, including details regarding any error messages,
version, and platform.
Example unit test to reproduce:
```c#
[Fact]
public void TestConcatenateSlicedArrays()
{
Int32Array array0 = new Int32Array.Builder()
.Append(new []{0, 1, 2})
.AppendNull()
.Append(new []{3, 4})
.Build();
Int32Array array1 = new Int32Array.Builder()
.Append(new []{5, 6})
.AppendNull()
.Append(new [] {7, 8, 9})
.Build();
var concatenated = ArrowArrayConcatenator.Concatenate(new[]
{
ArrowArrayFactory.Slice(array0, 2, 3),
ArrowArrayFactory.Slice(array1, 2, 3),
});
var expected = new Int32Array.Builder()
.Append(2).AppendNull().Append(3)
.AppendNull().Append(new[] { 7, 8 })
.Build();
Assert.Equal(expected, (IReadOnlyList<int?>)concatenated);
}
```
This fails with:
```
Assert.Equal() Failure: Collections differ
↓ (pos 0)
Expected: [2, null, 3, null, 7, ···]
Actual: [0, 1, 2, 5, 6, ···]
↑ (pos 0)
```
### Component(s)
C#
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