81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <cstdint>
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#include <functional>
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#include <memory>
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#include <vector>
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#include "arrow/acero/exec_plan.h"
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#include "arrow/acero/util.h"
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#include "arrow/acero/visibility.h"
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#include "arrow/compute/type_fwd.h"
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#include "arrow/status.h"
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#include "arrow/type_fwd.h"
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#include "arrow/util/cancel.h"
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#include "arrow/util/type_fwd.h"
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namespace arrow {
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namespace acero {
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/// A utility base class for simple exec nodes with one input
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///
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/// Pause/Resume Producing are forwarded appropriately
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/// There is nothing to do in StopProducingImpl
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///
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/// An AtomicCounter is used to keep track of when all data has arrived. When it
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/// has the Finish() method will be invoked
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class ARROW_ACERO_EXPORT MapNode : public ExecNode, public TracedNode {
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public:
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MapNode(ExecPlan* plan, std::vector<ExecNode*> inputs,
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std::shared_ptr<Schema> output_schema);
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Status InputFinished(ExecNode* input, int total_batches) override;
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Status StartProducing() override;
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void PauseProducing(ExecNode* output, int32_t counter) override;
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void ResumeProducing(ExecNode* output, int32_t counter) override;
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Status InputReceived(ExecNode* input, ExecBatch batch) override;
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const Ordering& ordering() const override;
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protected:
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Status StopProducingImpl() override;
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/// Transform a batch
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///
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/// The output batch will have the same guarantee as the input batch
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/// If this was the last batch this call may trigger Finish()
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virtual Result<ExecBatch> ProcessBatch(ExecBatch batch) = 0;
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/// Function called after all data has been received
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///
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/// By default this does nothing. Override this to provide a custom implementation.
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virtual void Finish();
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protected:
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// Counter for the number of batches received
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AtomicCounter input_counter_;
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};
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} // namespace acero
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} // namespace arrow
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