bkietz commented on pull request #9471:
URL: https://github.com/apache/arrow/pull/9471#issuecomment-777589915
Consider the following test case:
```c++
TEST(TestCompareKernel, AdHoc) {
int32_t definitely_not_init[4];
Int32Array null_int32s(4, Buffer::Wrap(definitely_not_init, 4),
*AllocateEmptyBitmap(4));
auto null_bools = CallFunction("equal", {
null_int32s.data(),
ArrayFromJSON(int32(), "[1,2,3,4]"),
})->array_as<BooleanArray>();
ASSERT_EQ(null_bools->null_count(), 4);
}
```
We don't make guarantees about `null_bools->Value(2)`; its value is allowed
to be indeterminate. If we want to take responsibility for never accessing
values under null bits that will be a much larger project
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