felipecrv commented on code in PR #40147:
URL: https://github.com/apache/arrow/pull/40147#discussion_r1513129138


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cpp/src/arrow/filesystem/s3fs.cc:
##########
@@ -2145,7 +2166,10 @@ class S3FileSystem::Impl : public 
std::enable_shared_from_this<S3FileSystem::Imp
           child_path_ss << bucket << kSep << child_key;
           child_key = child_path_ss.str();
           if (obj.GetSize() > 0 || !had_trailing_slash) {
-            // We found a real file
+            // We found a real file.
+            // XXX Ideally, for 0-sized files we would also check the 
Content-Type
+            // against kAwsDirectoryContentType, but ListObjectsV2 does not 
give
+            // that information.

Review Comment:
   > I agree it's not very pretty, but if it solves a real issue for users, 
then we should probably do it IMHO.
   
   The restriction I'm asking for doesn't prevent the issue to be fixed. We can 
support directories on paths not ending with a `/`. I'm asking to not expand 
the scope of the fix to also allow files on paths with trailing `/`.



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