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Qingping HouChao Sun
46040c9189c
Qingping Hou authored and Chao Sun committed 021ff20044a
ARROW-8752: [Rust] remove unused hashmaps in build_array_reader

Closes #7139 from houqp/qp_cleanup

Authored-by: Qingping Hou <dave2008713@gmail.com>
Signed-off-by: Chao Sun <sunchao@apache.org>