Haowei Yu created ARROW-15782:
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Summary: [C++] Findre2Alt.cmake did not honor RE2_ROOT
Key: ARROW-15782
URL: https://issues.apache.org/jira/browse/ARROW-15782
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 7.0.0
Reporter: Haowei Yu
In Findre2Alt.cmake, cmake module find re2 package config first, which is
likely to find system re2 package first over my customized re2 library. We
should check RE2_ROOT variable first, and if there is no value existed, then we
should search for system re2.
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