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Heres, Daniel authored and Andrew Lamb committed 61b0cb1b474
ARROW-11358: [Rust] Add benchmark for concatenating small arrays This is a common usecase in DataFusion, for coalescing & hash aggregates. Closes #9302 from Dandandan/concat_perf Authored-by: Heres, Daniel <danielheres@gmail.com> Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>