[I] [Java] StructVector throws with ExtensionType [arrow-java]

[via GitHub]

FiV0 opened a new issue, #87:
URL: https://github.com/apache/arrow-java/issues/87

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Currently when creating a struct vector with a child being an extension type 
things throw:
   ```java
     @Test
     public void testStructVectorWithExtensionTypes() {
       TestExtensionType.UuidType uuidType = new TestExtensionType.UuidType();
       Field uuidField =  new Field("struct_child", 
FieldType.nullable(uuidType), null);
       Field structField = new Field("struct", FieldType.nullable(new 
ArrowType.Struct()), List.of(uuidField));
       // throws
       StructVector s1 = new StructVector(structField, allocator, null);
       // doesn't throw
       StructVector s2 = (StructVector) structField.createVector(allocator);
       s1.close();
       s2.close();
     }
   ```
   
   I am mainly running into this while trying to create a `TransferPair`.
   ```java
     @Test
     public void testStructVectorTransferPairWithExtensionType() {
       TestExtensionType.UuidType uuidType = new TestExtensionType.UuidType();
       Field uuidField =  new Field("uuid_child", FieldType.nullable(uuidType), 
null);
       Field structField = new Field("struct", FieldType.nullable(new 
ArrowType.Struct()), List.of(uuidField));
   
       StructVector s1 = (StructVector) structField.createVector(allocator);
       TestExtensionType.UuidVector uuidVector = s1.addOrGet("uuid_child", 
FieldType.nullable(uuidType), TestExtensionType.UuidVector.class);
       s1.setValueCount(1);
       uuidVector.set(0, new UUID(1, 2));
       s1.setIndexDefined(0);
   
       TransferPair tp = s1.getTransferPair(structField, allocator);
       final StructVector toVector = (StructVector) tp.getTo();
       assertEquals(s1.getField(), toVector.getField());
       assertEquals(s1.getField().getChildren().get(0), 
toVector.getField().getChildren().get(0));
       // also fails but probably another issue
   //    assertEquals(s1.getValueCount(), toVector.getValueCount());
   //    assertEquals(s1, toVector);
   
       s1.close();
       toVector.close();
     }
   ```
   
   ### Component(s)
   
   Java


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