Benjamin Kietzman created ARROW-4515:
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Summary: [C++, lint] Use clang-format more efficiently in
`check-format` target
Key: ARROW-4515
URL: https://issues.apache.org/jira/browse/ARROW-4515
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Benjamin Kietzman
Assignee: Benjamin Kietzman
`clang-format` supports command line option `-output-replacements-xml` which
(in the case of no required changes) outputs:
```
<?xml version='1.0'?>
<replacements xml:space='preserve' incomplete_format='false'>
</replacements>
```
Using this option during `check-format` instead of using python to compute a
diff between formatted and on-disk should speed up that target significantly
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