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Rossi Sun authored and GitHub committed 0aa622c52f9
GH-45196: [C++][Acero] Small refinement to hash join (#45197) ### Rationale for this change See #45196 ### What changes are included in this PR? Refine/simplify the code mentioned in the issue. ### Are these changes tested? Existing tests suffice. ### Are there any user-facing changes? None. * GitHub Issue: #45196 Authored-by: Rossi Sun <zanmato1984@gmail.com> Signed-off-by: Rossi Sun <zanmato1984@gmail.com>