pitrou commented on code in PR #13115:
URL: https://github.com/apache/arrow/pull/13115#discussion_r871513128
##########
docs/source/format/CDataInterface.rst:
##########
@@ -292,6 +295,8 @@ are available under the Apache License 2.0.
void* private_data;
};
+ #endif // ARROW_C_DATA_H
+
Review Comment:
We could add an explanation here, feel free to elaborate on this suggestion
```suggestion
.. note::
The canonical guard ``ARROW_C_DATA_INTERFACE`` is meant to avoid duplicate
definitions if two projects copy the C data interface definitions in
their own headers,
and a third-party project includes from these two projects.
It is therefore important that this guard is kept exactly as-is when
these definitions
are copied.
```
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