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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