Yibo Cai created ARROW-8537:
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Summary: [C++] Performance regression from ARROW-8523
Key: ARROW-8537
URL: https://issues.apache.org/jira/browse/ARROW-8537
Project: Apache Arrow
Issue Type: Bug
Reporter: Yibo Cai
I optimized BitmapReader in [this PR|https://github.com/apache/arrow/pull/6986]
and see performance uplift of BitmapReader test case. I didn't check other test
cases as this change looks trivial.
I reviewed all test cases just now and see big performance drop of 4 cases,
details at [PR
link|https://github.com/apache/arrow/pull/6986#issuecomment-616915079].
I also compared performance of code using BitmapReader, no obvious changes
found. Looks we should revert that PR.
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