Commits
Ryan Murray authored and Wes McKinney committed d2ddaa6cb67
ARROW-1692: [Java] UnionArray round trip not working This fixes the integration tests for Union Arrays. Both Dense and Sparse unions now work: * validity buffer added to Sparse Union * both Union types now track logical types rather than MinorType enum ordinal Dependent on #7289 for duplicate field names. Closes #7290 from rymurr/ARROW-1692 Authored-by: Ryan Murray <rymurr@dremio.com> Signed-off-by: Wes McKinney <wesm@apache.org>