jarohen opened a new issue, #40773:
URL: https://github.com/apache/arrow/issues/40773
### Describe the bug, including details regarding any error messages,
version, and platform.
I cannot create a StructVector with a dense-union child - it fails with the
following stack trace:
```
java.lang.UnsupportedOperationException: Unknown type: DENSEUNION
at
org.apache.arrow.vector.complex.impl.NullableStructWriter.<init>(NullableStructWriter.java:258)
at
org.apache.arrow.vector.complex.StructVector.<init>(StructVector.java:69)
at xtdb.vector.StructVectorWriterTest.struct with DUV
child(StructVectorWriterTest.kt:101)
```
Test code is essentially:
```java
Field child = new Field("child", FieldType.notNullable(new
ArrowType.Union(UnionMode.Dense, null)), emptyList());
Field struct = new Field("foo",
FieldType.notNullable(ArrowType.Struct.INSTANCE), List.of(child));
try(RootAllocator allocator = new RootAllocator();
StructVector structVec = new StructVector(struct, allocator,
null)) {
System.out.println("working!");
}
```
I suspect it's a case of adding `DENSEUNION` to the `switch` in the
`NullableStructWriter` constructor, with a similar implementation to the sparse
`UNION`?
Cheers,
James
### Component(s)
Java
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