emkornfield commented on a change in pull request #11436:
URL: https://github.com/apache/arrow/pull/11436#discussion_r732186429



##########
File path: cpp/src/arrow/filesystem/gcsfs.cc
##########
@@ -58,9 +61,48 @@ struct GcsPath {
   }
 };
 
-}  // namespace
+class GcsInputStream : public arrow::io::InputStream {
+ public:
+  explicit GcsInputStream(gcs::ObjectReadStream stream) : 
stream_(std::move(stream)) {}
 
-namespace gcs = google::cloud::storage;
+  ~GcsInputStream() override = default;
+
+  Status Close() override {
+    stream_.Close();

Review comment:
       Just wanted to check if stream_.Close() is idempotent (not sure if this 
is a requirement but I believe all of the other interface implementations allow 
it). e.g. 
[S3](https://github.com/apache/arrow/blob/700ac1e783fad0107e812318c4edadfb5856e45b/cpp/src/arrow/filesystem/s3fs.cc#L926)




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