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Kenta MurataWes McKinney
1fcbc6dc0cb
Kenta Murata authored and Wes McKinney committed 954547adf14
ARROW-9499: [C++] AdaptiveIntBuilder::AppendNull does not increment the null count

I found that both `AdaptiveIntBuilder::AppendNull` and `AdaptiveUIntBuilder::AppendNull` did not  increment its `null_count_`.

By the way, I inserted additional assertions to check builder's `null_count` some appropriate places.

Closes #7780 from mrkn/ARROW-9499

Authored-by: Kenta Murata <mrkn@mrkn.jp>
Signed-off-by: Wes McKinney <wesm@apache.org>