Wes McKinney created ARROW-7974:
-----------------------------------

             Summary: [Developer][C++] ResourceWarning in "make check-format"
                 Key: ARROW-7974
                 URL: https://issues.apache.org/jira/browse/ARROW-7974
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Developer Tools
            Reporter: Wes McKinney
             Fix For: 1.0.0


Related to ARROW-7973, I also see

{code}
$ ninja check-format
[1/1] cd /home/wesm/code/arrow/cpp/preflight...ce_dir 
/home/wesm/code/arrow/cpp/src --quiet
/home/wesm/code/arrow/cpp/build-support/run_clang_format.py:77: 
ResourceWarning: unclosed file <_io.TextIOWrapper 
name='/home/wesm/code/arrow/cpp/build-support/lint_exclusions.txt' mode='r' 
encoding='UTF-8'>
  for line in open(arguments.exclude_globs):
ResourceWarning: Enable tracemalloc to get the object allocation traceback
{code}



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