myegorov opened a new pull request, #44631:
URL: https://github.com/apache/arrow/pull/44631
### Rationale for this change
Do not throw [UnsupportedOperationException("Tried to get allocator from
NullVector")](https://github.com/apache/arrow/blob/release-18.0.0-rc0/java/vector/src/main/java/org/apache/arrow/vector/NullVector.java#L160)
from
[VectorSchemaRoot.slice()](https://github.com/apache/arrow/blob/release-18.0.0-rc0/java/vector/src/main/java/org/apache/arrow/vector/VectorSchemaRoot.java#L341)
when slicing a VSR containing a NullVector or ZeroVector. Details in
https://github.com/apache/arrow/issues/44344
### Are these changes tested?
Added unit test that would trigger an UnsupportedOperationException on the
legacy path.
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