vibhatha commented on code in PR #41646:
URL: https://github.com/apache/arrow/pull/41646#discussion_r1605595990


##########
cpp/src/arrow/engine/substrait/extension_internal.cc:
##########
@@ -0,0 +1,51 @@
+// 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.
+
+// This API is EXPERIMENTAL.
+
+#include "arrow/engine/substrait/extension_internal.h"
+
+#include "substrait/algebra.pb.h"
+
+namespace arrow {
+namespace engine {
+
+Status FromProto(const substrait::extensions::AdvancedExtension& extension,
+                 std::unordered_map<std::string, std::string>& out) {
+  if (!extension.has_enhancement()) {
+    return Status::Invalid("AdvancedExtension does not have enhancement");
+  }
+  const auto& enhancement = extension.enhancement();
+  substrait::Expression_Literal literal;
+
+  if (!enhancement.UnpackTo(&literal)) {
+    return Status::Invalid("Unpack the literal failed");
+  }
+
+  if (!literal.has_map()) {
+    return Status::Invalid("Literal does not have map");

Review Comment:
   nit: 
   ```suggestion
       return Status::Invalid("Literal does not have a map");
   ```



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