**Reporter**: [Li Jin](https://issues.apache.org/jira/browse/ARROW-1815) / @icexelloss **Assignee**: [Bryan Cutler](https://issues.apache.org/jira/browse/ARROW-1815) / @BryanCutler #### Related issues: - [[Java] Combine MapVector and NonNullableMapVector Classes](https://github.com/apache/arrow/issues/17859) (is blocked by) #### PRs and other links: - [GitHub Pull Request #1490](https://github.com/apache/arrow/pull/1490) <sub>**Note**: *This issue was originally created as [ARROW-1815](https://issues.apache.org/jira/browse/ARROW-1815). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>