feat: Add a way to unset a file name in an object store path

object_store/src/path/file.rs

@@ -92,6 +92,11 @@ impl FilePath {
     pub fn parts_after_prefix(&self, prefix: &Self) -> Option<Vec<PathPart>> {
         self.inner.parts_after_prefix(&prefix.inner)
     }
+
+    /// Remove this path's file name, if there is one.
+    pub fn unset_file_name(&mut self) {
+        self.inner = mem::take(&mut self.inner).unset_file_name();
+    }
 }
 
 impl From<FilePath> for DirsAndFileName {
@@ -192,6 +197,13 @@ impl FilePathRepresentation {
         Self::Parsed(dirs_and_file_name)
     }
 
+    fn unset_file_name(self) -> Self {
+        let mut dirs_and_file_name: DirsAndFileName = self.into();
+
+        dirs_and_file_name.unset_file_name();
+        Self::Parsed(dirs_and_file_name)
+    }
+
     /// Add the parts of `path` to the end of this path. Notably does
     /// *not* behave as `PathBuf::push` does: there is no way to replace the
     /// root. If `self` has a file name, that will be removed, then the

object_store/src/path/parsed.rs

@@ -122,6 +122,11 @@ impl DirsAndFileName {
     pub(crate) fn push_part_as_dir(&mut self, part: &PathPart) {
         self.directories.push(part.to_owned());
     }
+
+    /// Remove the file name, if any.
+    pub(crate) fn unset_file_name(&mut self) {
+        self.file_name = None;
+    }
 }
 
 #[cfg(test)]