FiV0 opened a new issue, #41686:
URL: https://github.com/apache/arrow/issues/41686
### Describe the bug, including details regarding any error messages,
version, and platform.
When copying a struct vector via a transfer pair the nullability of the
children is not preserved
```java
@Test
public void testMakeTransferPairPreserveNullability() {
Field intField = new Field("int",
FieldType.notNullable(MinorType.INT.getType()), null);
Field structField = new Field("struct",
FieldType.notNullable(Struct.INSTANCE), List.of(intField));
FieldVector vec = structField.createVector(allocator);
TransferPair tp = vec.getTransferPair(new Field("struct",
FieldType.nullable(Struct.INSTANCE), List.of(intField)), allocator);
tp.transfer();
FieldVector res = (FieldVector) tp.getTo();
// passes
assertEquals(intField, vec.getField().getChildren().get(0));
// fails
assertEquals(intField, res.getField().getChildren().get(0));
}
```
results in the failure
```
Expected :int: Int(32, true) not null
Actual :int: Int(32, true)
```
### Component(s)
Java
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