westonpace commented on a change in pull request #12279:
URL: https://github.com/apache/arrow/pull/12279#discussion_r799929285



##########
File path: cpp/src/arrow/engine/substrait/serde.h
##########
@@ -0,0 +1,79 @@
+// 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.
+
+#pragma once
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "arrow/buffer.h"
+#include "arrow/compute/exec/exec_plan.h"
+#include "arrow/compute/exec/options.h"
+#include "arrow/engine/substrait/extension_set.h"
+#include "arrow/engine/visibility.h"
+#include "arrow/result.h"
+#include "arrow/util/string_view.h"
+
+namespace arrow {
+namespace engine {
+
+using ConsumerFactory = 
std::function<std::shared_ptr<compute::SinkNodeConsumer>()>;

Review comment:
       I've come to terms with it.  I think I need to understand / internalize 
more what it means for a Substrait plan to have multiple root relations.  Let's 
not worry about it now.  The comments you added are very helpful.




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