[I] [Java] Nullability of struct child vectors not preserved in TransferPair [arrow]

[via GitHub]

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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