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David Li authored and Micah Kornfield committed 3fc0cc0cdfc
ARROW-5255: [Java] Proof-of-concept of Java extension types Not quite sure that `ExtensionType` and `ExtensionTypeVector` are correct. Also, needs a more sophisticated example/more complete unit tests. Author: David Li <li.davidm96@gmail.com> Closes #4251 from lihalite/arrow-java-extension-types and squashes the following commits: 7c740ed76 <David Li> Proof-of-concept of Java extension types