pitrou commented on code in PR #36266:
URL: https://github.com/apache/arrow/pull/36266#discussion_r1403415485
##########
cpp/src/arrow/compute/kernels/scalar_cast_test.cc:
##########
@@ -2104,6 +2104,11 @@ TEST(Cast, BinaryToString) {
// ARROW-16757: we no longer zero copy, but the contents are equal
ASSERT_NE(invalid_utf8->data()->buffers[1].get(),
strings->data()->buffers[2].get());
ASSERT_TRUE(invalid_utf8->data()->buffers[1]->Equals(*strings->data()->buffers[2]));
+
+ // ARROW-35901: check that casting with first buffer being a `nullptr`
works
+ auto fixed_array_null = ArrayFromJSON(from_type, "[]");
+ fixed_array_null->data()->buffers[0] = NULLPTR;
Review Comment:
Let's make sure that this is a valid array?
```suggestion
fixed_array_null->data()->buffers[0] = NULLPTR;
ASSERT_OK(fixed_array_null->ValidateFull());
```
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