pitrou commented on code in PR #13577:
URL: https://github.com/apache/arrow/pull/13577#discussion_r920300795


##########
r/R/io.R:
##########
@@ -241,7 +241,9 @@ mmap_open <- function(path, mode = c("read", "write", 
"readwrite")) {
 make_readable_file <- function(file, mmap = TRUE, compression = NULL, 
filesystem = NULL) {
   if (inherits(file, "SubTreeFileSystem")) {
     filesystem <- file$base_fs
-    file <- file$base_path
+    # SubTreeFileSystem adds a slash to base_path, but filesystems will reject 
file names
+    # with trailing slashes, so we need to remove it here.
+    file <- sub("/$", "", file$base_path)

Review Comment:
   No, I am asking something else. It seems that this code is replacing `file` 
(a FileSystem instance) with a file path, is that right? And below, the file 
path `file` will be treated as a local filesystem path?



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