Sort results from ls_with_sizes LocalFS helper.

Author: shaunrd0

tiledb/sm/filesystem/local.cc

@@ -126,6 +126,11 @@ LsObjects LocalFilesystem::ls_filtered_v2(
 
 Status LocalFilesystem::ls(
     const std::string& path, std::vector<std::string>* paths) const {
+  // Noop if the parent ` path ` is not a directory, do not error out.
+  if (!is_dir(URI(path))) {
+    return Status::Ok();
+  }
+
   for (auto& fs : ls_with_sizes(URI(path), false)) {
     paths->emplace_back(fs.path().native());
   }

tiledb/sm/filesystem/vfs.cc

@@ -364,12 +364,21 @@ bool VFS::is_bucket(const URI& uri) const {
 Status VFS::ls(const URI& parent, std::vector<URI>* uris) const {
   stats_->add_counter("ls_num", 1);
 
-  const auto entries = parent.is_file() ? local_.ls_with_sizes(parent, false) :
-                                          ls_with_sizes(parent);
+  auto entries = parent.is_file() ? local_.ls_with_sizes(parent, false) :
+                                    ls_with_sizes(parent);
+  if (parent.is_file()) {
+    parallel_sort(
+        compute_tp_,
+        entries.begin(),
+        entries.end(),
+        [](const directory_entry& l, const directory_entry& r) {
+          return l.path().native() < r.path().native();
+        });
+  }
+
   for (const auto& fs : entries) {
     uris->emplace_back(fs.path().native());
   }
-
   return Status::Ok();
 }