westonpace commented on code in PR #12672:
URL: https://github.com/apache/arrow/pull/12672#discussion_r845748534
##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -724,5 +728,99 @@ TEST(Substrait, ExtensionSetFromPlan) {
EXPECT_EQ(decoded_add_func.name, "add");
}
+TEST(Substrait, GetRecordBatchReader) {
+ const auto parquet_root = std::getenv("PARQUET_TEST_DATA");
Review Comment:
There is `GetEnvVar` in `io_util.cc` that returns `Result<std::string>`
which you can `ASSERT_OK_AND_ASSIGN`. That might lead to slightly clearer
errors in case the test data environment variable is not set. As it stands
`getenv` will return `nullptr` and then constructing a string with it will
trigger `std::exception`.
##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -724,5 +728,99 @@ TEST(Substrait, ExtensionSetFromPlan) {
EXPECT_EQ(decoded_add_func.name, "add");
}
+TEST(Substrait, GetRecordBatchReader) {
+ const auto parquet_root = std::getenv("PARQUET_TEST_DATA");
+ std::string dir_string(parquet_root);
+ std::stringstream ss;
+ ss << dir_string << "/binary.parquet";
+ auto file_path = ss.str();
Review Comment:
`/` isn't a valid directory separator on Windows. Maybe use something like
(not 100% sure this is correct)
`PlatformFilename::FromString(dir_string).Join("binary.parquet")`
##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -724,5 +728,99 @@ TEST(Substrait, ExtensionSetFromPlan) {
EXPECT_EQ(decoded_add_func.name, "add");
}
+TEST(Substrait, GetRecordBatchReader) {
+ const auto parquet_root = std::getenv("PARQUET_TEST_DATA");
+ std::string dir_string(parquet_root);
+ std::stringstream ss;
+ ss << dir_string << "/binary.parquet";
+ auto file_path = ss.str();
+
+ std::string substrait_json = R"({
+ "relations": [
+ {"rel": {
+ "read": {
+ "base_schema": {
+ "struct": {
+ "types": [
+ {"binary": {}}
+ ]
+ },
+ "names": [
+ "foo"
+ ]
+ },
+ "local_files": {
+ "items": [
+ {
+ "uri_file": "file://FILENAME_PLACEHOLDER",
+ "format": "FILE_FORMAT_PARQUET"
+ }
+ ]
+ }
+ }
+ }}
+ ]
+ })";
+
+ std::string filename_placeholder = "FILENAME_PLACEHOLDER";
+ substrait_json.replace(substrait_json.find(filename_placeholder),
+ filename_placeholder.size(), file_path);
+ AsyncGenerator<util::optional<cp::ExecBatch>> sink_gen;
+ cp::ExecContext exec_context(default_memory_pool(),
+ arrow::internal::GetCpuThreadPool());
+ ASSERT_OK_AND_ASSIGN(auto plan, cp::ExecPlan::Make());
+ engine::SubstraitExecutor executor(substrait_json, &sink_gen, plan,
+ exec_context);
+ ASSERT_OK_AND_ASSIGN(auto reader, executor.Execute());
+ ASSERT_OK(executor.Close());
+
+ ASSERT_OK_AND_ASSIGN(auto table, Table::FromRecordBatchReader(reader.get()));
+ EXPECT_GT(table->num_rows(), 0);
+}
+
+TEST(Substrait, GetRecordBatchReaderUtil) {
+ const auto parquet_root = std::getenv("PARQUET_TEST_DATA");
+ std::string dir_string(parquet_root);
+ std::stringstream ss;
+ ss << dir_string << "/binary.parquet";
+ auto file_path = ss.str();
Review Comment:
Same comments here as above. Also, you could maybe move this logic into a
helper function. Especially if we can avoid repeating the long substrait_json
string.
##########
cpp/src/arrow/engine/substrait/util.h:
##########
@@ -0,0 +1,89 @@
+// 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 <memory>
+#include <string>
+#include <vector>
+#include "arrow/compute/type_fwd.h"
+#include "arrow/engine/api.h"
+#include "arrow/util/async_generator.h"
+#include "arrow/util/iterator.h"
+#include "arrow/util/optional.h"
+
+namespace arrow {
+
+namespace cp = arrow::compute;
+
+namespace engine {
+
+/// \brief A SinkNodeConsumer specialized to output ExecBatches via
PushGenerator
+class ARROW_ENGINE_EXPORT SubstraitSinkConsumer : public cp::SinkNodeConsumer {
+ public:
+ explicit SubstraitSinkConsumer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* generator,
+ arrow::util::BackpressureOptions backpressure = {})
+ : producer_(MakeProducer(generator, std::move(backpressure))) {}
+
+ Status Consume(cp::ExecBatch batch) override;
+
+ static arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+ MakeProducer(AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure);
+
+ Future<> Finish() override;
+
+ private:
+ PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer producer_;
+};
+
+/// \brief An executor to run a Substrait Query
+/// This interface is provided as a utility when creating language
+/// bindings for consuming a Substrait plan.
+class ARROW_ENGINE_EXPORT SubstraitExecutor {
+ public:
+ explicit SubstraitExecutor(
+ std::string substrait_json,
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* generator,
+ std::shared_ptr<cp::ExecPlan> plan,
Review Comment:
Why do I need to provide `generator` and `plan`? I would think that this
class should take care of those things for me.
##########
cpp/src/arrow/engine/substrait/util.cc:
##########
@@ -0,0 +1,100 @@
+// 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.
+
+#include "arrow/engine/substrait/util.h"
+
+namespace arrow {
+
+namespace engine {
+
+Status SubstraitSinkConsumer::Consume(cp::ExecBatch batch) {
+ // Consume a batch of data
+ bool did_push = producer_.Push(batch);
+ if (!did_push) return Status::ExecutionError("Producer closed already");
+ return Status::OK();
+}
+
+Future<> SubstraitSinkConsumer::Finish() {
+ producer_.Push(IterationEnd<arrow::util::optional<cp::ExecBatch>>());
+ if (producer_.Close()) {
+ return Future<>::MakeFinished();
+ }
+ return Future<>::MakeFinished(
+ Status::ExecutionError("Error occurred in closing the batch producer"));
+}
+
+Status SubstraitExecutor::MakePlan() {
+ ARROW_ASSIGN_OR_RAISE(auto serialized_plan,
+ engine::internal::SubstraitFromJSON("Plan",
substrait_json_));
+ RETURN_NOT_OK(engine::internal::SubstraitToJSON("Plan", *serialized_plan));
+ std::vector<std::shared_ptr<cp::SinkNodeConsumer>> consumers;
+ std::function<std::shared_ptr<cp::SinkNodeConsumer>()> consumer_factory =
[&] {
+ consumers.emplace_back(new SubstraitSinkConsumer{generator_});
+ return consumers.back();
+ };
Review Comment:
```suggestion
std::function<std::shared_ptr<cp::SinkNodeConsumer>()> consumer_factory =
[&] {
return std::make_shared<SubstraitSinkConsumer>(generator_);
};
```
The created `declarations_` will manage ownerhsip of the consumer (I'm
pretty sure). Either way, this vector isn't keeping the consumers alive for
very long and I don't think it is needed.
##########
cpp/src/arrow/engine/substrait/util.cc:
##########
@@ -0,0 +1,100 @@
+// 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.
+
+#include "arrow/engine/substrait/util.h"
+
+namespace arrow {
+
+namespace engine {
+
+Status SubstraitSinkConsumer::Consume(cp::ExecBatch batch) {
+ // Consume a batch of data
+ bool did_push = producer_.Push(batch);
+ if (!did_push) return Status::ExecutionError("Producer closed already");
+ return Status::OK();
+}
+
+Future<> SubstraitSinkConsumer::Finish() {
+ producer_.Push(IterationEnd<arrow::util::optional<cp::ExecBatch>>());
+ if (producer_.Close()) {
+ return Future<>::MakeFinished();
+ }
+ return Future<>::MakeFinished(
+ Status::ExecutionError("Error occurred in closing the batch producer"));
+}
+
+Status SubstraitExecutor::MakePlan() {
+ ARROW_ASSIGN_OR_RAISE(auto serialized_plan,
+ engine::internal::SubstraitFromJSON("Plan",
substrait_json_));
+ RETURN_NOT_OK(engine::internal::SubstraitToJSON("Plan", *serialized_plan));
+ std::vector<std::shared_ptr<cp::SinkNodeConsumer>> consumers;
+ std::function<std::shared_ptr<cp::SinkNodeConsumer>()> consumer_factory =
[&] {
+ consumers.emplace_back(new SubstraitSinkConsumer{generator_});
+ return consumers.back();
+ };
+ ARROW_ASSIGN_OR_RAISE(declarations_,
+ engine::DeserializePlan(*serialized_plan,
consumer_factory));
+ return Status::OK();
+}
+
+arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+SubstraitSinkConsumer::MakeProducer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure) {
+ arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>> push_gen(
+ std::move(backpressure));
+ auto out = push_gen.producer();
+ *out_gen = std::move(push_gen);
+ return out;
+}
+
+Result<std::shared_ptr<RecordBatchReader>> SubstraitExecutor::Execute() {
+ RETURN_NOT_OK(SubstraitExecutor::MakePlan());
+ for (const cp::Declaration& decl : declarations_) {
+ RETURN_NOT_OK(decl.AddToPlan(plan_.get()).status());
+ }
+ ARROW_RETURN_NOT_OK(plan_->Validate());
+ ARROW_RETURN_NOT_OK(plan_->StartProducing());
+ auto schema = plan_->sinks()[0]->output_schema();
+ std::shared_ptr<RecordBatchReader> sink_reader = cp::MakeGeneratorReader(
+ schema, std::move(*generator_), exec_context_.memory_pool());
+ return sink_reader;
+}
+
+Status SubstraitExecutor::Close() {
+ ARROW_RETURN_NOT_OK(plan_->finished().status());
+ return Status::OK();
+}
Review Comment:
```suggestion
Status SubstraitExecutor::Close() {
return plan_->finished().status();
}
```
##########
cpp/src/arrow/engine/substrait/util.cc:
##########
@@ -0,0 +1,100 @@
+// 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.
+
+#include "arrow/engine/substrait/util.h"
+
+namespace arrow {
+
+namespace engine {
+
+Status SubstraitSinkConsumer::Consume(cp::ExecBatch batch) {
+ // Consume a batch of data
+ bool did_push = producer_.Push(batch);
+ if (!did_push) return Status::ExecutionError("Producer closed already");
+ return Status::OK();
+}
+
+Future<> SubstraitSinkConsumer::Finish() {
+ producer_.Push(IterationEnd<arrow::util::optional<cp::ExecBatch>>());
+ if (producer_.Close()) {
+ return Future<>::MakeFinished();
+ }
+ return Future<>::MakeFinished(
+ Status::ExecutionError("Error occurred in closing the batch producer"));
+}
+
+Status SubstraitExecutor::MakePlan() {
+ ARROW_ASSIGN_OR_RAISE(auto serialized_plan,
+ engine::internal::SubstraitFromJSON("Plan",
substrait_json_));
+ RETURN_NOT_OK(engine::internal::SubstraitToJSON("Plan", *serialized_plan));
+ std::vector<std::shared_ptr<cp::SinkNodeConsumer>> consumers;
+ std::function<std::shared_ptr<cp::SinkNodeConsumer>()> consumer_factory =
[&] {
+ consumers.emplace_back(new SubstraitSinkConsumer{generator_});
+ return consumers.back();
+ };
+ ARROW_ASSIGN_OR_RAISE(declarations_,
+ engine::DeserializePlan(*serialized_plan,
consumer_factory));
+ return Status::OK();
+}
+
+arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+SubstraitSinkConsumer::MakeProducer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure) {
+ arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>> push_gen(
+ std::move(backpressure));
+ auto out = push_gen.producer();
+ *out_gen = std::move(push_gen);
+ return out;
+}
+
+Result<std::shared_ptr<RecordBatchReader>> SubstraitExecutor::Execute() {
+ RETURN_NOT_OK(SubstraitExecutor::MakePlan());
+ for (const cp::Declaration& decl : declarations_) {
+ RETURN_NOT_OK(decl.AddToPlan(plan_.get()).status());
+ }
+ ARROW_RETURN_NOT_OK(plan_->Validate());
+ ARROW_RETURN_NOT_OK(plan_->StartProducing());
+ auto schema = plan_->sinks()[0]->output_schema();
+ std::shared_ptr<RecordBatchReader> sink_reader = cp::MakeGeneratorReader(
+ schema, std::move(*generator_), exec_context_.memory_pool());
+ return sink_reader;
+}
+
+Status SubstraitExecutor::Close() {
+ ARROW_RETURN_NOT_OK(plan_->finished().status());
+ return Status::OK();
+}
+
+Result<std::shared_ptr<RecordBatchReader>>
SubstraitExecutor::GetRecordBatchReader(
+ std::string& substrait_json) {
+ cp::ExecContext exec_context(arrow::default_memory_pool(),
+ ::arrow::internal::GetCpuThreadPool());
+
+ arrow::AsyncGenerator<arrow::util::optional<cp::ExecBatch>> sink_gen;
+ ARROW_ASSIGN_OR_RAISE(auto plan, cp::ExecPlan::Make());
+ arrow::engine::SubstraitExecutor executor(substrait_json, &sink_gen, plan,
+ exec_context);
+ RETURN_NOT_OK(executor.MakePlan());
+ ARROW_ASSIGN_OR_RAISE(auto sink_reader, executor.Execute());
Review Comment:
Minor nit: It might be slightly simpler to have `executor.Execute()` make
the call to `MakePlan` and `Close`. That way `SubstraitExecutor` only has one
public method there's less coupling between this static method and the class.
On the other hand, if you want to keep it this way, I would change the
method `MakePlan` to be named `Init`.
##########
cpp/src/arrow/engine/substrait/util.cc:
##########
@@ -0,0 +1,100 @@
+// 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.
+
+#include "arrow/engine/substrait/util.h"
+
+namespace arrow {
+
+namespace engine {
+
+Status SubstraitSinkConsumer::Consume(cp::ExecBatch batch) {
+ // Consume a batch of data
+ bool did_push = producer_.Push(batch);
+ if (!did_push) return Status::ExecutionError("Producer closed already");
+ return Status::OK();
+}
+
+Future<> SubstraitSinkConsumer::Finish() {
+ producer_.Push(IterationEnd<arrow::util::optional<cp::ExecBatch>>());
+ if (producer_.Close()) {
+ return Future<>::MakeFinished();
+ }
+ return Future<>::MakeFinished(
+ Status::ExecutionError("Error occurred in closing the batch producer"));
+}
+
+Status SubstraitExecutor::MakePlan() {
+ ARROW_ASSIGN_OR_RAISE(auto serialized_plan,
+ engine::internal::SubstraitFromJSON("Plan",
substrait_json_));
+ RETURN_NOT_OK(engine::internal::SubstraitToJSON("Plan", *serialized_plan));
+ std::vector<std::shared_ptr<cp::SinkNodeConsumer>> consumers;
+ std::function<std::shared_ptr<cp::SinkNodeConsumer>()> consumer_factory =
[&] {
+ consumers.emplace_back(new SubstraitSinkConsumer{generator_});
+ return consumers.back();
+ };
+ ARROW_ASSIGN_OR_RAISE(declarations_,
+ engine::DeserializePlan(*serialized_plan,
consumer_factory));
+ return Status::OK();
+}
+
+arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+SubstraitSinkConsumer::MakeProducer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure) {
+ arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>> push_gen(
+ std::move(backpressure));
+ auto out = push_gen.producer();
+ *out_gen = std::move(push_gen);
+ return out;
+}
+
+Result<std::shared_ptr<RecordBatchReader>> SubstraitExecutor::Execute() {
+ RETURN_NOT_OK(SubstraitExecutor::MakePlan());
+ for (const cp::Declaration& decl : declarations_) {
+ RETURN_NOT_OK(decl.AddToPlan(plan_.get()).status());
+ }
+ ARROW_RETURN_NOT_OK(plan_->Validate());
+ ARROW_RETURN_NOT_OK(plan_->StartProducing());
+ auto schema = plan_->sinks()[0]->output_schema();
+ std::shared_ptr<RecordBatchReader> sink_reader = cp::MakeGeneratorReader(
+ schema, std::move(*generator_), exec_context_.memory_pool());
Review Comment:
We shouldn't have to grab the `output_schema` from the sink.
##########
cpp/src/arrow/engine/substrait/util.h:
##########
@@ -0,0 +1,89 @@
+// 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 <memory>
+#include <string>
+#include <vector>
+#include "arrow/compute/type_fwd.h"
+#include "arrow/engine/api.h"
+#include "arrow/util/async_generator.h"
+#include "arrow/util/iterator.h"
+#include "arrow/util/optional.h"
+
+namespace arrow {
+
+namespace cp = arrow::compute;
+
+namespace engine {
+
+/// \brief A SinkNodeConsumer specialized to output ExecBatches via
PushGenerator
+class ARROW_ENGINE_EXPORT SubstraitSinkConsumer : public cp::SinkNodeConsumer {
+ public:
+ explicit SubstraitSinkConsumer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* generator,
+ arrow::util::BackpressureOptions backpressure = {})
+ : producer_(MakeProducer(generator, std::move(backpressure))) {}
+
+ Status Consume(cp::ExecBatch batch) override;
+
+ static arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+ MakeProducer(AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure);
+
+ Future<> Finish() override;
+
+ private:
+ PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer producer_;
+};
+
+/// \brief An executor to run a Substrait Query
+/// This interface is provided as a utility when creating language
+/// bindings for consuming a Substrait plan.
+class ARROW_ENGINE_EXPORT SubstraitExecutor {
Review Comment:
Can we move this class into the `.cc` file? It should be an implementation
detail. Then take the static method `GetRecordBatchReader` and make it a
file-scoped function (i.e. global static function). This way the user never
has to know about the `SubstraitExecutor`.
##########
cpp/src/arrow/engine/substrait/util.h:
##########
@@ -0,0 +1,89 @@
+// 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 <memory>
+#include <string>
+#include <vector>
+#include "arrow/compute/type_fwd.h"
+#include "arrow/engine/api.h"
+#include "arrow/util/async_generator.h"
+#include "arrow/util/iterator.h"
+#include "arrow/util/optional.h"
+
+namespace arrow {
+
+namespace cp = arrow::compute;
+
+namespace engine {
+
+/// \brief A SinkNodeConsumer specialized to output ExecBatches via
PushGenerator
+class ARROW_ENGINE_EXPORT SubstraitSinkConsumer : public cp::SinkNodeConsumer {
+ public:
+ explicit SubstraitSinkConsumer(
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* generator,
+ arrow::util::BackpressureOptions backpressure = {})
+ : producer_(MakeProducer(generator, std::move(backpressure))) {}
+
+ Status Consume(cp::ExecBatch batch) override;
+
+ static arrow::PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer
+ MakeProducer(AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* out_gen,
+ arrow::util::BackpressureOptions backpressure);
+
+ Future<> Finish() override;
+
+ private:
+ PushGenerator<arrow::util::optional<cp::ExecBatch>>::Producer producer_;
+};
+
+/// \brief An executor to run a Substrait Query
+/// This interface is provided as a utility when creating language
+/// bindings for consuming a Substrait plan.
+class ARROW_ENGINE_EXPORT SubstraitExecutor {
+ public:
+ explicit SubstraitExecutor(
+ std::string substrait_json,
+ AsyncGenerator<arrow::util::optional<cp::ExecBatch>>* generator,
+ std::shared_ptr<cp::ExecPlan> plan,
+ cp::ExecContext exec_context)
+ : substrait_json_(substrait_json),
+ generator_(generator),
+ plan_(std::move(plan)),
+ exec_context_(exec_context) {}
+
+ Result<std::shared_ptr<RecordBatchReader>> Execute();
+
+ Status Close();
+
+ static Result<std::shared_ptr<RecordBatchReader>> GetRecordBatchReader(
+ std::string& substrait_json);
Review Comment:
We should have another overload that takes a buffer. We're using json a lot
for testing purposes but in real cases we will be passing substrait plans
around in protobuf binary form (e.g. buffer). Then we just skip the
"deserialize from json" step.
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