cpp/src/reader/qds_without_timegenerator.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.
 */

#ifndef READER_QDS_WITHOUT_TIMEGENERATOR_H
#define READER_QDS_WITHOUT_TIMEGENERATOR_H

#include <map>
#include <vector>

#include "expression.h"
#include "file/tsfile_io_reader.h"
#include "result_set.h"

namespace storage {

class QDSWithoutTimeGenerator : public ResultSet {
   public:
    QDSWithoutTimeGenerator()
        : result_set_metadata_(nullptr),
          io_reader_(nullptr),
          qe_(nullptr),
          ssi_vec_(),
          tsblocks_(),
          time_iters_(),
          value_iters_(),
          heap_time_(),
          remaining_offset_(0),
          remaining_limit_(-1),
          is_single_path_(false) {}
    ~QDSWithoutTimeGenerator() { close(); }
    int init(TsFileIOReader* io_reader, QueryExpression* qe);
    int init(TsFileIOReader* io_reader, QueryExpression* qe, int offset,
             int limit);
    void close();
    int next(bool& has_next);
    bool is_null(const std::string& column_name);
    bool is_null(uint32_t column_index);
    RowRecord* get_row_record();
    std::shared_ptr<ResultSetMetadata> get_metadata();

   private:
    int init_internal(TsFileIOReader* io_reader, QueryExpression* qe);
    int get_next_tsblock(uint32_t index, bool alloc_mem);
    int get_next_tsblock_with_hint(uint32_t index, bool alloc_mem,
                                   int64_t min_time_hint);

   private:
    std::shared_ptr<ResultSetMetadata> result_set_metadata_;
    TsFileIOReader* io_reader_;
    QueryExpression* qe_;
    std::vector<TsFileSeriesScanIterator*> ssi_vec_;
    std::vector<common::TsBlock*> tsblocks_;
    std::vector<common::ColIterator*> time_iters_;
    std::vector<common::ColIterator*> value_iters_;
    std::multimap<int64_t, uint32_t>
        heap_time_;  // key-->time, value-->path_index
    int remaining_offset_;
    int remaining_limit_;
    bool is_single_path_;
};

}  // namespace storage

#endif  // READER_QDS_WITHOUT_TIMEGENERATOR_H