pitrou commented on code in PR #39067:
URL: https://github.com/apache/arrow/pull/39067#discussion_r1507840757


##########
cpp/src/arrow/filesystem/filesystem.h:
##########
@@ -519,6 +574,82 @@ Result<std::shared_ptr<FileSystem>> 
FileSystemFromUriOrPath(
 
 /// @}
 
+/// \defgroup filesystem-factory-registration Helpers for FileSystem 
registration
+///
+/// @{
+
+/// \brief Register a Filesystem factory
+///
+/// Support for custom Uri schemes can be added by registering a factory
+/// for the corresponding FileSystem.
+///
+/// \param[in] scheme a Uri scheme which the factory will handle.
+///            If a factory has already been registered for a scheme,
+///            the new factory will be ignored.

Review Comment:
   This is orthogonal with wanting an eager error return, though.



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