hadrian-reppas opened a new issue, #50262:
URL: https://github.com/apache/arrow/issues/50262
### Describe the bug, including details regarding any error messages,
version, and platform.
```
ArrayVector children{ArrayFromJSON(int64(), "[1, 2]"),
ArrayFromJSON(int8(), "[null, 3]")};
auto type_ids = ArrayFromJSON(int8(), "[0, 1]");
auto type = sparse_union({field("a", int64()), field("b", int8())});
auto array =
std::make_shared<SparseUnionArray>(type, 2, children,
type_ids->data()->buffers[1]);
auto slice = array->Slice(1);
ASSERT_FALSE(array->IsNull(0));
ASSERT_FALSE(array->IsNull(1));
ASSERT_FALSE(slice->IsNull(0)); // This should succeeded, but it fails
ASSERT_OK_AND_ASSIGN(auto expected, array->GetScalar(1));
ASSERT_OK_AND_ASSIGN(auto actual, slice->GetScalar(0));
AssertScalarsEqual(*expected, *actual); // This should succeeded, but it
fails
```
### Component(s)
C++
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