be/src/storage/segment/empty_segment_iterator.h

// 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 "common/status.h"
#include "storage/iterators.h"
#include "storage/schema.h"

namespace doris {
class Block;

namespace segment_v2 {

class EmptySegmentIterator : public RowwiseIterator {
public:
    explicit EmptySegmentIterator(const Schema& schema);
    ~EmptySegmentIterator() override {}
    Status init(const StorageReadOptions& opts) override { return Status::OK(); }
    const Schema& schema() const override { return _schema; }
    Status next_batch(Block* block) override;
    bool empty() const override { return true; }

private:
    const Schema& _schema;
};

} // namespace segment_v2
} // namespace doris