emkornfield commented on a change in pull request #12763:
URL: https://github.com/apache/arrow/pull/12763#discussion_r841092781



##########
File path: cpp/src/arrow/filesystem/gcsfs.cc
##########
@@ -33,13 +33,23 @@
 
 namespace arrow {
 namespace fs {
-struct GcsCredentials {
-  explicit GcsCredentials(std::shared_ptr<google::cloud::Credentials> c)
+struct GcsCredentialsHolder {
+  explicit GcsCredentialsHolder(std::shared_ptr<google::cloud::Credentials> c)
       : credentials(std::move(c)) {}
 
   std::shared_ptr<google::cloud::Credentials> credentials;
 };
 
+bool GcsCredentials::Equals(const GcsCredentials& other) const {
+  if (holder_->credentials == other.holder_->credentials) {
+    return true;
+  }
+  return anonymous_ == other.anonymous_ && access_token_ == 
other.access_token_ &&

Review comment:
       There seems to be an expectation of being able to serialize/deserialize 
the FS implementation via pickle.   I didn't see any method directly on 
credentials that would allow this, but happy to use this if one exists, along 
with this comes the need for deep equality I think.  Since credentials didn't 
support this keeping all inputs seemed like the only viable way of doing it.   




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