// 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 "storage/tablet/tablet_reader.h"

#include <gen_cpp/olap_file.pb.h>

#include <gen_cpp/segment_v2.pb.h>

#include <thrift/protocol/TDebugProtocol.h>

#include <algorithm>

#include <functional>

#include <iterator>

#include <memory>

#include <numeric>

#include <ostream>

#include <set>

#include <shared_mutex>

#include <unordered_map>

#include "common/compiler_util.h" // IWYU pragma: keep

#include "common/config.h"

#include "common/exception.h"

#include "common/logging.h"

#include "common/status.h"

#include "core/arena.h"

#include "core/block/block.h"

#include "exec/common/variant_util.h"

#include "exprs/bloom_filter_func.h"

#include "exprs/create_predicate_function.h"

#include "exprs/hybrid_set.h"

#include "runtime/query_context.h"

#include "runtime/runtime_predicate.h"

#include "runtime/runtime_state.h"

#include "storage/delete/delete_handler.h"

#include "storage/index/bloom_filter/bloom_filter.h"

#include "storage/itoken_extractor.h"

#include "storage/olap_common.h"

#include "storage/olap_define.h"

#include "storage/predicate/block_column_predicate.h"

#include "storage/predicate/column_predicate.h"

#include "storage/predicate/like_column_predicate.h"

#include "storage/predicate/predicate_creator.h"

#include "storage/row_cursor.h"

#include "storage/schema.h"

#include "storage/tablet/tablet.h"

#include "storage/tablet/tablet_meta.h"

#include "storage/tablet/tablet_schema.h"

namespace doris {

using namespace ErrorCode;

void TabletReader::ReaderParams::check_validation() const {

    if (UNLIKELY(version.first == -1 && is_segcompaction == false)) {

        throw Exception(Status::FatalError("version is not set. tablet={}", tablet->tablet_id()));

    }

}

Status TabletReader::init(const ReaderParams& read_params) {

    Status res = _init_params(read_params);

    if (!res.ok()) {

        LOG(WARNING) << "fail to init reader when init params. res:" << res

                     << ", tablet_id:" << read_params.tablet->tablet_id()

                     << ", schema_hash:" << read_params.tablet->schema_hash()

                     << ", reader type:" << int(read_params.reader_type)

                     << ", version:" << read_params.version;

    }

    return res;

}

void TabletReader::remove_delete_columns_from_access_paths(

        const DeleteHandler& delete_handler, const TabletSchema& tablet_schema,

        std::map<int32_t, TColumnAccessPaths>& all_access_paths) {

    auto delete_predicates = AndBlockColumnPredicate::create_shared();

    std::unordered_map<int32_t, std::vector<std::shared_ptr<const ColumnPredicate>>>

            del_predicates_for_zone_map;

    delete_handler.get_delete_conditions_after_version(0, delete_predicates.get(),

                                                       &del_predicates_for_zone_map);

    std::set<ColumnId> delete_column_ids;

    delete_predicates->get_all_column_ids(delete_column_ids);

    for (auto cid : delete_column_ids) {

        all_access_paths.erase(tablet_schema.column(cid).unique_id());

    }

}

Status TabletReader::_capture_rs_readers(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_capture_rs_readers_timer_ns);

    if (read_params.rs_splits.empty()) {

        return Status::InternalError("fail to acquire data sources. tablet={}",

                                     _tablet->tablet_id());

    }

    bool eof = false;

    bool is_lower_key_included = _keys_param.start_key_include;

    bool is_upper_key_included = _keys_param.end_key_include;

    for (int i = 0; i < _keys_param.start_keys.size(); ++i) {

        // lower bound

        RowCursor& start_key = _keys_param.start_keys[i];

        RowCursor& end_key = _keys_param.end_keys[i];

        if (!is_lower_key_included) {

            if (compare_row_key(start_key, end_key) >= 0) {

                VLOG_NOTICE << "return EOF when lower key not include"

                            << ", start_key=" << start_key.to_string()

                            << ", end_key=" << end_key.to_string();

                eof = true;

                break;

            }

        } else {

            if (compare_row_key(start_key, end_key) > 0) {

                VLOG_NOTICE << "return EOF when lower key include="

                            << ", start_key=" << start_key.to_string()

                            << ", end_key=" << end_key.to_string();

                eof = true;

                break;

            }

        }

        _is_lower_keys_included.push_back(is_lower_key_included);

        _is_upper_keys_included.push_back(is_upper_key_included);

    }

    if (eof) {

        return Status::EndOfFile("reach end of scan range. tablet={}", _tablet->tablet_id());

    }

    bool need_ordered_result = true;

    if (read_params.reader_type == ReaderType::READER_QUERY ||

        read_params.reader_type == ReaderType::READER_BINLOG) {

        if (_tablet_schema->keys_type() == DUP_KEYS) {

            // duplicated keys are allowed, no need to merge sort keys in rowset

            need_ordered_result = false;

        }

        if (_tablet_schema->keys_type() == UNIQUE_KEYS &&

            _tablet->enable_unique_key_merge_on_write()) {

            // unique keys with merge on write, no need to merge sort keys in rowset

            need_ordered_result = false;

        }

        if (_aggregation) {

            // compute engine will aggregate rows with the same key,

            // it's ok for rowset to return unordered result

            need_ordered_result = false;

        }

        if (_direct_mode) {

            // direct mode indicates that the storage layer does not need to merge,

            // it's ok for rowset to return unordered result

            need_ordered_result = false;

        }

        if (read_params.read_orderby_key) {

            need_ordered_result = true;

        }

    }

    _reader_context.reader_type = read_params.reader_type;

    _reader_context.version = read_params.version;

    _reader_context.tablet_schema = _tablet_schema;

    _reader_context.need_ordered_result = need_ordered_result;

    _reader_context.topn_filter_source_node_ids = read_params.topn_filter_source_node_ids;

    _reader_context.topn_filter_target_node_id = read_params.topn_filter_target_node_id;

    _reader_context.read_orderby_key_reverse = read_params.read_orderby_key_reverse;

    _reader_context.use_insert_order_when_same =

            read_params.use_insert_order_when_same ||

            read_params.reader_type == ReaderType::READER_BINLOG ||

            read_params.reader_type == ReaderType::READER_BINLOG_COMPACTION;

    _reader_context.force_key_ordered_read = read_params.force_key_ordered_read;

    _reader_context.read_orderby_key_limit = read_params.read_orderby_key_limit;

    _reader_context.return_columns = &_return_columns;

    _reader_context.read_orderby_key_columns =

            !_orderby_key_columns.empty() ? &_orderby_key_columns : nullptr;

    _reader_context.predicates = &_col_predicates;

    _reader_context.value_predicates = &_value_col_predicates;

    _reader_context.lower_bound_keys = &_keys_param.start_keys;

    _reader_context.is_lower_keys_included = &_is_lower_keys_included;

    _reader_context.upper_bound_keys = &_keys_param.end_keys;

    _reader_context.is_upper_keys_included = &_is_upper_keys_included;

    _reader_context.delete_handler = &_delete_handler;

    _reader_context.stats = &_stats;

    _reader_context.use_page_cache = read_params.use_page_cache;

    _reader_context.sequence_id_idx = _sequence_col_idx;

    _reader_context.is_unique = tablet()->keys_type() == UNIQUE_KEYS;

    _reader_context.merged_rows = &_merged_rows;

    _reader_context.delete_bitmap = read_params.delete_bitmap;

    _reader_context.enable_unique_key_merge_on_write = tablet()->enable_unique_key_merge_on_write();

    _reader_context.enable_mor_value_predicate_pushdown =

            read_params.enable_mor_value_predicate_pushdown;

    _reader_context.record_rowids = read_params.record_rowids;

    _reader_context.rowid_conversion = read_params.rowid_conversion;

    _reader_context.is_key_column_group = read_params.is_key_column_group;

    _reader_context.common_expr_ctxs_push_down = read_params.common_expr_ctxs_push_down;

    _reader_context.output_columns = &read_params.output_columns;

    _reader_context.push_down_agg_type_opt = read_params.push_down_agg_type_opt;

    _reader_context.ttl_seconds = _tablet->ttl_seconds();

    _reader_context.score_runtime = read_params.score_runtime;

    _reader_context.collection_statistics = read_params.collection_statistics;

    _reader_context.virtual_column_exprs = read_params.virtual_column_exprs;

    _reader_context.vir_cid_to_idx_in_block = read_params.vir_cid_to_idx_in_block;

    _reader_context.vir_col_idx_to_type = read_params.vir_col_idx_to_type;

    _reader_context.ann_topn_runtime = read_params.ann_topn_runtime;

    _reader_context.condition_cache_digest = read_params.condition_cache_digest;

    _reader_context.all_access_paths = read_params.all_access_paths;

    _reader_context.predicate_access_paths = read_params.predicate_access_paths;

    // Force a full read of delete-condition columns: the FE can't see storage deletes and may

    // mark them meta-only (OFFSET/NULL), whose content-less read makes the delete predicate

    // match nothing and leak deleted rows.

    if (!_delete_handler.empty() && !_reader_context.all_access_paths.empty()) {

        remove_delete_columns_from_access_paths(_delete_handler, *_tablet_schema,

                                                _reader_context.all_access_paths);

    }

    // Propagate general read limit for DUP_KEYS and UNIQUE_KEYS with MOW

    _reader_context.general_read_limit = read_params.general_read_limit;

    // Multi-stage predicate lazy materialization (experimental)

    _reader_context.enable_multi_stage_predicate_lazy_materialization =

            read_params.enable_multi_stage_predicate_lazy_materialization;

    _reader_context.predicate_lm_stage1_column_ids = read_params.predicate_lm_stage1_column_ids;

    _reader_context.predicate_lm_stage1_survival_ratio_threshold =

            read_params.predicate_lm_stage1_survival_ratio_threshold;

    // Preserve the original requested output layout so BlockReader can map expanded storage

    // columns (for non-direct AGG/UNIQUE paths) back to the final output block.

    _reader_context.origin_return_columns = read_params.origin_return_columns;

    return Status::OK();

}

TabletColumn TabletReader::materialize_column(const TabletColumn& orig) {

    if (!orig.is_variant_type()) {

        return orig;

    }

    TabletColumn column_with_cast_type = orig;

    auto cast_type = _reader_context.target_cast_type_for_variants.at(orig.name());

    return variant_util::get_column_by_type(cast_type, orig.name(),

                                            {

                                                    .unique_id = orig.unique_id(),

                                                    .parent_unique_id = orig.parent_unique_id(),

                                                    .path_info = *orig.path_info_ptr(),

                                            });

}

Status TabletReader::_init_params(const ReaderParams& read_params) {

    read_params.check_validation();

    _direct_mode = read_params.direct_mode;

    _aggregation = read_params.aggregation;

    _reader_type = read_params.reader_type;

    _tablet = read_params.tablet;

    _tablet_schema = read_params.tablet_schema;

    _reader_context.runtime_state = read_params.runtime_state;

    _reader_context.target_cast_type_for_variants = read_params.target_cast_type_for_variants;

    RETURN_IF_ERROR(_init_conditions_param(read_params));

    Status res = _init_delete_condition(read_params);

    if (!res.ok()) {

        LOG(WARNING) << "fail to init delete param. res = " << res;

        return res;

    }

    res = _init_return_columns(read_params);

    if (!res.ok()) {

        LOG(WARNING) << "fail to init return columns. res = " << res;

        return res;

    }

    res = _init_keys_param(read_params);

    if (!res.ok()) {

        LOG(WARNING) << "fail to init keys param. res=" << res;

        return res;

    }

    res = _init_orderby_keys_param(read_params);

    if (!res.ok()) {

        LOG(WARNING) << "fail to init orderby keys param. res=" << res;

        return res;

    }

    if (_tablet_schema->has_sequence_col()) {

        auto sequence_col_idx = _tablet_schema->sequence_col_idx();

        DCHECK_NE(sequence_col_idx, -1);

        for (auto col : _return_columns) {

            // query has sequence col

            if (col == sequence_col_idx) {

                _sequence_col_idx = sequence_col_idx;

                break;

            }

        }

    }

    return res;

}

Status TabletReader::_init_return_columns(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_init_return_columns_timer_ns);

    if (read_params.reader_type == ReaderType::READER_QUERY ||

        read_params.reader_type == ReaderType::READER_BINLOG) {

        _return_columns = read_params.return_columns;

        _tablet_columns_convert_to_null_set = read_params.tablet_columns_convert_to_null_set;

        for (auto id : read_params.return_columns) {

            if (_tablet_schema->column(id).is_key()) {

                _key_cids.push_back(id);

            } else {

                _value_cids.push_back(id);

            }

        }

    } else if (read_params.return_columns.empty()) {

        for (uint32_t i = 0; i < _tablet_schema->num_columns(); ++i) {

            _return_columns.push_back(i);

            if (_tablet_schema->column(i).is_key()) {

                _key_cids.push_back(i);

            } else {

                _value_cids.push_back(i);

            }

        }

        VLOG_NOTICE << "return column is empty, using full column as default.";

    } else if ((read_params.reader_type == ReaderType::READER_CUMULATIVE_COMPACTION ||

                read_params.reader_type == ReaderType::READER_SEGMENT_COMPACTION ||

                read_params.reader_type == ReaderType::READER_BASE_COMPACTION ||

                read_params.reader_type == ReaderType::READER_FULL_COMPACTION ||

                read_params.reader_type == ReaderType::READER_BINLOG_COMPACTION ||

                read_params.reader_type == ReaderType::READER_COLD_DATA_COMPACTION ||

                read_params.reader_type == ReaderType::READER_ALTER_TABLE) &&

               !read_params.return_columns.empty()) {

        _return_columns = read_params.return_columns;

        for (auto id : read_params.return_columns) {

            if (_tablet_schema->column(id).is_key()) {

                _key_cids.push_back(id);

            } else {

                _value_cids.push_back(id);

            }

        }

    } else if (read_params.reader_type == ReaderType::READER_CHECKSUM) {

        _return_columns = read_params.return_columns;

        for (auto id : read_params.return_columns) {

            if (_tablet_schema->column(id).is_key()) {

                _key_cids.push_back(id);

            } else {

                _value_cids.push_back(id);

            }

        }

    } else {

        return Status::Error<INVALID_ARGUMENT>(

                "fail to init return columns. reader_type={}, return_columns_size={}",

                int(read_params.reader_type), read_params.return_columns.size());

    }

    std::sort(_key_cids.begin(), _key_cids.end(), std::greater<>());

    return Status::OK();

}

Status TabletReader::_init_keys_param(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_init_keys_param_timer_ns);

    if (read_params.start_key.empty()) {

        return Status::OK();

    }

    _keys_param.start_key_include = read_params.start_key_include;

    _keys_param.end_key_include = read_params.end_key_include;

    size_t start_key_size = read_params.start_key.size();

    //_keys_param.start_keys.resize(start_key_size);

    std::vector<RowCursor>(start_key_size).swap(_keys_param.start_keys);

    size_t scan_key_size = read_params.start_key.front().size();

    if (scan_key_size > _tablet_schema->num_columns()) {

        return Status::Error<INVALID_ARGUMENT>(

                "Input param are invalid. Column count is bigger than num_columns of schema. "

                "column_count={}, schema.num_columns={}",

                scan_key_size, _tablet_schema->num_columns());

    }

    for (size_t i = 0; i < start_key_size; ++i) {

        if (read_params.start_key[i].size() != scan_key_size) {

            return Status::Error<INVALID_ARGUMENT>(

                    "The start_key.at({}).size={}, not equals the scan_key_size={}", i,

                    read_params.start_key[i].size(), scan_key_size);

        }

        Status res = _keys_param.start_keys[i].init(_tablet_schema, read_params.start_key[i]);

        if (!res.ok()) {

            LOG(WARNING) << "fail to init row cursor. res = " << res;

            return res;

        }

    }

    size_t end_key_size = read_params.end_key.size();

    //_keys_param.end_keys.resize(end_key_size);

    std::vector<RowCursor>(end_key_size).swap(_keys_param.end_keys);

    for (size_t i = 0; i < end_key_size; ++i) {

        if (read_params.end_key[i].size() != scan_key_size) {

            return Status::Error<INVALID_ARGUMENT>(

                    "The end_key.at({}).size={}, not equals the scan_key_size={}", i,

                    read_params.end_key[i].size(), scan_key_size);

        }

        Status res = _keys_param.end_keys[i].init(_tablet_schema, read_params.end_key[i]);

        if (!res.ok()) {

            LOG(WARNING) << "fail to init row cursor. res = " << res;

            return res;

        }

    }

    //TODO:check the valid of start_key and end_key.(eg. start_key <= end_key)

    return Status::OK();

}

Status TabletReader::_init_orderby_keys_param(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_init_orderby_keys_param_timer_ns);

    // UNIQUE_KEYS will compare all keys as before

    if (_tablet_schema->keys_type() == DUP_KEYS || (_tablet_schema->keys_type() == UNIQUE_KEYS &&

                                                    _tablet->enable_unique_key_merge_on_write())) {

        if (!_tablet_schema->cluster_key_uids().empty()) {

            if (read_params.read_orderby_key_num_prefix_columns >

                _tablet_schema->cluster_key_uids().size()) {

                return Status::Error<ErrorCode::INTERNAL_ERROR>(

                        "read_orderby_key_num_prefix_columns={} > cluster_keys.size()={}",

                        read_params.read_orderby_key_num_prefix_columns,

                        _tablet_schema->cluster_key_uids().size());

            }

            for (uint32_t i = 0; i < read_params.read_orderby_key_num_prefix_columns; i++) {

                auto cid = _tablet_schema->cluster_key_uids()[i];

                auto index = _tablet_schema->field_index(cid);

                if (index < 0) {

                    return Status::Error<ErrorCode::INTERNAL_ERROR>(

                            "could not find cluster key column with unique_id=" +

                            std::to_string(cid) +

                            " in tablet schema, tablet_id=" + std::to_string(_tablet->tablet_id()));

                }

                for (uint32_t idx = 0; idx < _return_columns.size(); idx++) {

                    if (_return_columns[idx] == index) {

                        _orderby_key_columns.push_back(idx);

                        break;

                    }

                }

            }

        } else {

            // find index in vector _return_columns

            //   for the read_orderby_key_num_prefix_columns orderby keys

            for (uint32_t i = 0; i < read_params.read_orderby_key_num_prefix_columns; i++) {

                for (uint32_t idx = 0; idx < _return_columns.size(); idx++) {

                    if (_return_columns[idx] == i) {

                        _orderby_key_columns.push_back(idx);

                        break;

                    }

                }

            }

        }

        if (read_params.read_orderby_key_num_prefix_columns != _orderby_key_columns.size()) {

            return Status::Error<ErrorCode::INTERNAL_ERROR>(

                    "read_orderby_key_num_prefix_columns != _orderby_key_columns.size, "

                    "read_params.read_orderby_key_num_prefix_columns={}, "

                    "_orderby_key_columns.size()={}",

                    read_params.read_orderby_key_num_prefix_columns, _orderby_key_columns.size());

        }

    }

    return Status::OK();

}

Status TabletReader::_init_conditions_param(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_init_conditions_param_timer_ns);

    std::vector<std::shared_ptr<ColumnPredicate>> predicates;

    std::copy(read_params.predicates.cbegin(), read_params.predicates.cend(),

              std::inserter(predicates, predicates.begin()));

    // Function filter push down to storage engine

    auto is_like_predicate = [](std::shared_ptr<ColumnPredicate> _pred) {

        return dynamic_cast<LikeColumnPredicate*>(_pred.get()) != nullptr;

    };

    for (const auto& filter : read_params.function_filters) {

        predicates.emplace_back(_parse_to_predicate(filter));

        auto pred = predicates.back();

        const auto& col = _tablet_schema->column(pred->column_id());

        const auto* tablet_index = _tablet_schema->get_ngram_bf_index(col.unique_id());

        if (is_like_predicate(pred) && tablet_index && config::enable_query_like_bloom_filter) {

            std::unique_ptr<segment_v2::BloomFilter> ng_bf;

            std::string pattern = pred->get_search_str();

            auto gram_bf_size = tablet_index->get_gram_bf_size();

            auto gram_size = tablet_index->get_gram_size();

            RETURN_IF_ERROR(segment_v2::BloomFilter::create(segment_v2::NGRAM_BLOOM_FILTER, &ng_bf,

                                                            gram_bf_size));

            NgramTokenExtractor _token_extractor(gram_size);

            if (_token_extractor.string_like_to_bloom_filter(pattern.data(), pattern.length(),

                                                             *ng_bf)) {

                pred->set_page_ng_bf(std::move(ng_bf));

            }

        }

    }

    int32_t delete_sign_idx = _tablet_schema->delete_sign_idx();

    for (auto predicate : predicates) {

        auto column = _tablet_schema->column(predicate->column_id());

        if (column.aggregation() != FieldAggregationMethod::OLAP_FIELD_AGGREGATION_NONE) {

            // When MOR value predicate pushdown is enabled, drop __DORIS_DELETE_SIGN__

            // from storage-layer predicates entirely. Delete sign must only be evaluated

            // post-merge via VExpr to prevent deleted rows from reappearing.

            if (read_params.enable_mor_value_predicate_pushdown && delete_sign_idx >= 0 &&

                predicate->column_id() == static_cast<uint32_t>(delete_sign_idx)) {

                continue;

            }

            _value_col_predicates.push_back(predicate);

        } else {

            _col_predicates.push_back(predicate);

        }

    }

    return Status::OK();

}

std::shared_ptr<ColumnPredicate> TabletReader::_parse_to_predicate(

        const FunctionFilter& function_filter) {

    int32_t index = _tablet_schema->field_index(function_filter._col_name);

    if (index < 0) {

        throw Exception(Status::InternalError("Column {} not found in tablet schema",

                                              function_filter._col_name));

        return nullptr;

    }

    const TabletColumn& column = materialize_column(_tablet_schema->column(index));

    return create_column_predicate(index, std::make_shared<FunctionFilter>(function_filter),

                                   column.type(), &column);

}

Status TabletReader::_init_delete_condition(const ReaderParams& read_params) {

    SCOPED_RAW_TIMER(&_stats.tablet_reader_init_delete_condition_param_timer_ns);

    // If it's cumu and not allow do delete when cumu

    if (read_params.reader_type == ReaderType::READER_SEGMENT_COMPACTION ||

        (read_params.reader_type == ReaderType::READER_CUMULATIVE_COMPACTION &&

         !config::enable_delete_when_cumu_compaction)) {

        return Status::OK();

    }

    bool cumu_delete = read_params.reader_type == ReaderType::READER_CUMULATIVE_COMPACTION &&

                       config::enable_delete_when_cumu_compaction;

    // Delete sign could not be applied when delete on cumu compaction is enabled, bucause it is meant for delete with predicates.

    // If delete design is applied on cumu compaction, it will lose effect when doing base compaction.

    // `_delete_sign_available` indicates the condition where we could apply delete signs to data.

    _delete_sign_available = (((read_params.reader_type == ReaderType::READER_BASE_COMPACTION ||

                                read_params.reader_type == ReaderType::READER_FULL_COMPACTION) &&

                               config::enable_prune_delete_sign_when_base_compaction) ||

                              read_params.reader_type == ReaderType::READER_COLD_DATA_COMPACTION ||

                              read_params.reader_type == ReaderType::READER_CHECKSUM);

    // `_filter_delete` indicates the condition where we should execlude deleted tuples when reading data.

    // However, queries will not use this condition but generate special where predicates to filter data.

    // (Though a lille bit confused, it is how the current logic working...)

    _filter_delete = _delete_sign_available || cumu_delete;

    return _delete_handler.init(_tablet_schema, read_params.delete_predicates,

                                read_params.version.second);

}

Status TabletReader::init_reader_params_and_create_block(

        TabletSharedPtr tablet, ReaderType reader_type,

        const std::vector<RowsetSharedPtr>& input_rowsets,

        TabletReader::ReaderParams* reader_params, Block* block) {

    reader_params->tablet = tablet;

    reader_params->reader_type = reader_type;

    reader_params->version =

            Version(input_rowsets.front()->start_version(), input_rowsets.back()->end_version());

    TabletReadSource read_source;

    for (const auto& rowset : input_rowsets) {

        RowsetReaderSharedPtr rs_reader;

        RETURN_IF_ERROR(rowset->create_reader(&rs_reader));

        read_source.rs_splits.emplace_back(std::move(rs_reader));

    }

    read_source.fill_delete_predicates();

    reader_params->set_read_source(std::move(read_source));

    std::vector<RowsetMetaSharedPtr> rowset_metas(input_rowsets.size());

    std::transform(input_rowsets.begin(), input_rowsets.end(), rowset_metas.begin(),

                   [](const RowsetSharedPtr& rowset) { return rowset->rowset_meta(); });

    TabletSchemaSPtr read_tablet_schema =

            tablet->tablet_schema_with_merged_max_schema_version(rowset_metas);

    TabletSchemaSPtr merge_tablet_schema = std::make_shared<TabletSchema>();

    merge_tablet_schema->copy_from(*read_tablet_schema);

    // Merge the columns in delete predicate that not in latest schema in to current tablet schema

    for (auto& del_pred : reader_params->delete_predicates) {

        merge_tablet_schema->merge_dropped_columns(*del_pred->tablet_schema());

    }

    reader_params->tablet_schema = merge_tablet_schema;

    reader_params->return_columns.resize(read_tablet_schema->num_columns());

    std::iota(reader_params->return_columns.begin(), reader_params->return_columns.end(), 0);

    reader_params->origin_return_columns = &reader_params->return_columns;

    *block = read_tablet_schema->create_block();

    return Status::OK();

}

} // namespace doris