cpp/src/reader/tsfile_series_scan_iterator.cc

/*
 * 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 "reader/tsfile_series_scan_iterator.h"

using namespace common;

namespace storage {

void TsFileSeriesScanIterator::destroy() {
    timeseries_index_pa_.destroy();
    chunk_reader_.destroy();
    if (tsblock_ != nullptr) {
        delete tsblock_;
        tsblock_ = nullptr;
    }
}

int TsFileSeriesScanIterator::get_next(TsBlock *&ret_tsblock, bool alloc,
                                       Filter *oneshoot_filter) {
    // TODO @filter
    int ret = E_OK;
    Filter *filter =
        (oneshoot_filter != nullptr) ? oneshoot_filter : time_filter_;
    if (!chunk_reader_.has_more_data()) {
        while (true) {
            if (!has_next_chunk()) {
                return E_NO_MORE_DATA;
            } else {
                advance_to_next_chunk();
                ChunkMeta *cm = get_current_chunk_meta();
                if (filter != nullptr && cm->statistic_ != nullptr &&
                    !filter->satisfy(cm->statistic_)) {
                    continue;
                }
                chunk_reader_.reset();
                if (RET_FAIL(chunk_reader_.load_by_meta(cm))) {
                }
            }
        }
    }
    if (IS_SUCC(ret)) {
        if (alloc) {
            ret_tsblock = alloc_tsblock();
        }
        ret = chunk_reader_.get_next_page(ret_tsblock, oneshoot_filter);
    }
    return ret;
}

void TsFileSeriesScanIterator::revert_tsblock() {
    if (tsblock_ == nullptr) {
        return;
    }
    delete tsblock_;
    tsblock_ = nullptr;
}

int TsFileSeriesScanIterator::init_chunk_reader() {
    int ret = E_OK;
    chunk_meta_cursor_ = timeseries_index_.get_chunk_meta_list()->begin();
    ChunkMeta *cm = chunk_meta_cursor_.get();
    ASSERT(!chunk_reader_.has_more_data());
    if (RET_FAIL(chunk_reader_.init(
            read_file_, timeseries_index_.get_measurement_name(),
            timeseries_index_.get_data_type(), time_filter_))) {
    } else if (RET_FAIL(chunk_reader_.load_by_meta(cm))) {
    } else {
        chunk_meta_cursor_++;
    }
    return ret;
}

TsBlock *TsFileSeriesScanIterator::alloc_tsblock() {
    ChunkHeader &ch = chunk_reader_.get_chunk_header();
    TsID dummy_ts_id;

    // TODO config
    ColumnDesc time_cd(common::INT64, TS_2DIFF, SNAPPY, INVALID_TTL, "time",
                       dummy_ts_id);
    ColumnDesc value_cd(ch.data_type_, ch.encoding_type_, ch.compression_type_,
                        INVALID_TTL, ch.measurement_name_, dummy_ts_id);

    tuple_desc_.push_back(time_cd);
    tuple_desc_.push_back(value_cd);

    tsblock_ = new TsBlock(&tuple_desc_);
    if (E_OK != tsblock_->init()) {
        delete tsblock_;
        tsblock_ = nullptr;
    }
    return tsblock_;
}

}  // end namespace storage