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Tai Le Manh authored and GitHub committed f8d3b10b4b8
GH-41590: [Java] Improve BaseRepeatedValueVector function on isEmpty and isNull operations (#41601) ### Rationale for this change Resolves #41590 . ### What changes are included in this PR? Make `abstract` on `isNull` and `isEmpty` of `BaseRepeatedValueVector`. ### Are these changes tested? Existing tests pass. ### Are there any user-facing changes? No. * GitHub Issue: #41590 Authored-by: Tai Le Manh <manhtai.lmt@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>