jarohen opened a new issue, #40999:
URL: https://github.com/apache/arrow/issues/40999
### Describe the bug, including details regarding any error messages,
version, and platform.
If a `DenseUnionVector` is contained within a nullable `StructVector`, and
that struct has nullable entries, trying to `splitAndTransfer` fails with an
`ArrayIndexOutOfBoundsException`.
Within a struct vector, if an entry is null, then the entries in its
children vectors are undefined, so DUV cannot always expect `typeId >= 0`, and
should guard against it where necessary.
Test case:
```java
@Test
public void testSplitAndTransferDuvInStruct() {
try (StructVector struct = StructVector.empty("struct", allocator)) {
DenseUnionVector duv = struct.addOrGet("duv",
FieldType.notNullable(MinorType.DENSEUNION.getType()),
DenseUnionVector.class);
byte i32TypeId = duv.registerNewTypeId(Field.notNullable("i32",
MinorType.INT.getType()));
duv.addVector(i32TypeId, new IntVector("i32", allocator));
struct.setIndexDefined(0);
duv.setTypeId(0, i32TypeId);
duv.setSafe(0, newIntHolder(42));
struct.setNull(1);
struct.setValueCount(2);
try (StructVector dest = StructVector.empty("dest", allocator)) {
TransferPair pair = struct.makeTransferPair(dest);
pair.splitAndTransfer(0, 2);
assertEquals(2, dest.getValueCount());
assertFalse(dest.isNull(0));
assertEquals(42, dest.getObject(0).get("duv"));
assertTrue(dest.isNull(1));
}
}
}
```
(PR incoming)
### Component(s)
Java
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