yingcai-cy commented on code in PR #80:
URL: https://github.com/apache/iceberg-cpp/pull/80#discussion_r2055226952


##########
src/iceberg/catalog/memory_catalog.h:
##########
@@ -0,0 +1,204 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#pragma once
+
+#include <mutex>
+#include <optional>
+#include <unordered_map>
+
+#include "iceberg/catalog.h"
+
+namespace iceberg {
+
+class NamespaceContainer;
+
+class ICEBERG_EXPORT MemoryCatalog : public Catalog {
+ public:
+  MemoryCatalog(std::shared_ptr<FileIO> file_io, std::string 
warehouse_location);
+
+  void Initialize(
+      const std::string& name,
+      const std::unordered_map<std::string, std::string>& properties) override;
+
+  std::string_view name() const override;
+
+  Result<std::vector<TableIdentifier>> ListTables(const Namespace& ns) const 
override;
+
+  Result<std::unique_ptr<Table>> CreateTable(
+      const TableIdentifier& identifier, const Schema& schema, const 
PartitionSpec& spec,
+      const std::string& location,
+      const std::unordered_map<std::string, std::string>& properties) override;
+
+  Result<std::unique_ptr<Table>> UpdateTable(
+      const TableIdentifier& identifier,
+      const std::vector<std::unique_ptr<UpdateRequirement>>& requirements,
+      const std::vector<std::unique_ptr<MetadataUpdate>>& updates) override;
+
+  Result<std::shared_ptr<Transaction>> StageCreateTable(
+      const TableIdentifier& identifier, const Schema& schema, const 
PartitionSpec& spec,
+      const std::string& location,
+      const std::unordered_map<std::string, std::string>& properties) override;
+
+  bool TableExists(const TableIdentifier& identifier) const override;

Review Comment:
   Can these two interfaces also return a result like above, so that we can 
return clear errors like backend database errors.



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