[GitHub] [arrow] westonpace commented on a diff in pull request #14974: ARROW-18436: [C++] Ensure correct (un)escaping of special characters in URI paths

[GitBox <gi...@apache.org>]

westonpace commented on code in PR #14974:
URL: https://github.com/apache/arrow/pull/14974#discussion_r1050139903


##########
cpp/src/arrow/util/uri.cc:
##########
@@ -306,14 +311,29 @@ Status Uri::Parse(const std::string& uri_string) {
   return Status::OK();
 }
 
-std::string UriFromAbsolutePath(const std::string& path) {
+Result<std::string> UriFromAbsolutePath(const std::string_view& path) {
+  if (path.empty()) {
+    return Status::Invalid(
+        "UriFromAbsolutePath expected an absolute path, got an empty string");
+  }
+  std::string out;
 #ifdef _WIN32
-  // Path is supposed to start with "X:/..."
-  return "file:///" + path;
+  // Turn "/" separators into "\", as Windows recognizes both but uriparser
+  // only the latter.
+  std::string fixed_path(path);
+  std::replace(fixed_path.begin(), fixed_path.end(), '/', '\\');
+  out.resize(8 + 3 * fixed_path.length() + 1);

Review Comment:
   Minor nit: Maybe a comment explaining this math?  Probably not needed if this is a normal Windows thing.



##########
cpp/src/arrow/util/uri.cc:
##########
@@ -58,10 +59,10 @@ bool IsDriveSpec(const std::string_view s) {
 
 }  // namespace
 
-std::string UriEscape(const std::string& s) {
+std::string UriEscape(const std::string_view& s) {

Review Comment:
   Minor nit: I think we've been preferring to pass `string_view` by value in Substrait per https://quuxplusone.github.io/blog/2021/11/09/pass-string-view-by-value/ and @bkietz 's advice



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