// 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.

// This file is copied from

// https://github.com/apache/impala/blob/branch-2.9.0/be/src/runtime/descriptors.cc

// and modified by Doris

#include "runtime/descriptors.h"

#include <fmt/format.h>

#include <gen_cpp/Descriptors_types.h>

#include <gen_cpp/Types_types.h>

#include <gen_cpp/descriptors.pb.h>

#include <stddef.h>

#include <thrift/protocol/TDebugProtocol.h>

#include <algorithm>

#include <boost/algorithm/string/join.hpp>

#include "common/exception.h"

#include "common/object_pool.h"

#include "core/column/column_nothing.h"

#include "core/data_type/data_type_array.h"

#include "core/data_type/data_type_decimal.h"

#include "core/data_type/data_type_factory.hpp"

#include "core/data_type/data_type_map.h"

#include "core/data_type/data_type_struct.h"

#include "core/types.h"

#include "exec/common/util.hpp"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/function/function_helpers.h"

#include "exprs/vexpr.h"

#include "util/string_util.h"

namespace doris {

SlotDescriptor::SlotDescriptor(const TSlotDescriptor& tdesc)

        : _id(tdesc.id),

          _type(DataTypeFactory::instance().create_data_type(tdesc.slotType,

                                                             tdesc.nullIndicatorBit != -1)),

          _parent(tdesc.parent),

          _col_pos(tdesc.columnPos),

          _col_name(tdesc.colName),

          _col_name_lower_case(to_lower(tdesc.colName)),

          _col_unique_id(tdesc.col_unique_id),

          _slot_idx(tdesc.slotIdx),

          _field_idx(-1),

          _is_key(tdesc.is_key),

          _column_paths(tdesc.column_paths),

          _all_access_paths(tdesc.__isset.all_access_paths ? tdesc.all_access_paths

                                                           : TColumnAccessPaths {}),

          _predicate_access_paths(tdesc.__isset.predicate_access_paths

                                          ? tdesc.predicate_access_paths

                                          : TColumnAccessPaths {}),

          _is_auto_increment(tdesc.__isset.is_auto_increment ? tdesc.is_auto_increment : false),

          _col_default_value(tdesc.__isset.col_default_value ? tdesc.col_default_value : "") {

    if (tdesc.__isset.virtual_column_expr) {

        // Make sure virtual column is valid.

        if (tdesc.virtual_column_expr.nodes.empty()) {

            throw doris::Exception(doris::ErrorCode::FATAL_ERROR,

                                   "Virtual column expr node is empty, col_name: {}, "

                                   "col_unique_id: {}",

                                   tdesc.colName, tdesc.col_unique_id);

        }

        const auto& node = tdesc.virtual_column_expr.nodes[0];

        if (node.node_type == TExprNodeType::SLOT_REF) {

            throw doris::Exception(doris::ErrorCode::FATAL_ERROR,

                                   "Virtual column expr node is slot ref, col_name: {}, "

                                   "col_unique_id: {}",

                                   tdesc.colName, tdesc.col_unique_id);

        }

        this->virtual_column_expr = std::make_shared<doris::TExpr>(tdesc.virtual_column_expr);

    }

}

SlotDescriptor::SlotDescriptor(const PSlotDescriptor& pdesc)

        : _id(pdesc.id()),

          _type(DataTypeFactory::instance().create_data_type(pdesc.slot_type(),

                                                             pdesc.null_indicator_bit() != -1)),

          _parent(pdesc.parent()),

          _col_pos(pdesc.column_pos()),

          _col_name(pdesc.col_name()),

          _col_name_lower_case(to_lower(pdesc.col_name())),

          _col_unique_id(pdesc.col_unique_id()),

          _slot_idx(pdesc.slot_idx()),

          _field_idx(-1),

          _is_key(pdesc.is_key()),

          _column_paths(pdesc.column_paths().begin(), pdesc.column_paths().end()),

          _is_auto_increment(pdesc.is_auto_increment()) {

    auto convert_to_thrift_column_access_path = [](const PColumnAccessPath& pb_path) {

        TColumnAccessPath thrift_path;

        thrift_path.type = (TAccessPathType::type)pb_path.type();

        if (pb_path.has_version()) {

            thrift_path.__set_version(pb_path.version());

        }

        if (pb_path.has_data_access_path()) {

            thrift_path.__isset.data_access_path = true;

            for (int i = 0; i < pb_path.data_access_path().path_size(); ++i) {

                thrift_path.data_access_path.path.push_back(pb_path.data_access_path().path(i));

            }

        }

        if (pb_path.has_meta_access_path()) {

            thrift_path.__isset.meta_access_path = true;

            for (int i = 0; i < pb_path.meta_access_path().path_size(); ++i) {

                thrift_path.meta_access_path.path.push_back(pb_path.meta_access_path().path(i));

            }

        }

        return thrift_path;

    };

    for (const auto& pb_path : pdesc.all_access_paths()) {

        _all_access_paths.push_back(convert_to_thrift_column_access_path(pb_path));

    }

    for (const auto& pb_path : pdesc.predicate_access_paths()) {

        _predicate_access_paths.push_back(convert_to_thrift_column_access_path(pb_path));

    }

}

#ifdef BE_TEST

SlotDescriptor::SlotDescriptor()

        : _id(0),

          _type(nullptr),

          _parent(0),

          _col_pos(0),

          _col_unique_id(0),

          _slot_idx(0),

          _field_idx(-1),

          _is_key(false),

          _is_auto_increment(false) {}

#endif

void SlotDescriptor::to_protobuf(PSlotDescriptor* pslot) const {

    pslot->set_id(_id);

    pslot->set_parent(_parent);

    _type->to_protobuf(pslot->mutable_slot_type());

    pslot->set_column_pos(_col_pos);

    pslot->set_byte_offset(0);

    pslot->set_null_indicator_byte(0);

    pslot->set_null_indicator_bit(_type->is_nullable() ? 0 : -1);

    pslot->set_col_name(_col_name);

    pslot->set_slot_idx(_slot_idx);

    pslot->set_col_unique_id(_col_unique_id);

    pslot->set_is_key(_is_key);

    pslot->set_is_auto_increment(_is_auto_increment);

    pslot->set_col_type(_type->get_primitive_type());

    for (const std::string& path : _column_paths) {

        pslot->add_column_paths(path);

    }

    auto convert_to_protobuf_column_access_path = [](const TColumnAccessPath& thrift_path,

                                                     doris::PColumnAccessPath* pb_path) {

        pb_path->Clear();

        pb_path->set_type((PAccessPathType)thrift_path.type); // 使用 reinterpret_cast 进行类型转换

        if (thrift_path.__isset.version) {

            pb_path->set_version(thrift_path.version);

        }

        if (thrift_path.__isset.data_access_path) {

            auto* pb_data = pb_path->mutable_data_access_path();

            pb_data->Clear();

            for (const auto& s : thrift_path.data_access_path.path) {

                pb_data->add_path(s);

            }

        }

        if (thrift_path.__isset.meta_access_path) {

            auto* pb_meta = pb_path->mutable_meta_access_path();

            pb_meta->Clear();

            for (const auto& s : thrift_path.meta_access_path.path) {

                pb_meta->add_path(s);

            }

        }

    };

    for (const auto& path : _all_access_paths) {

        auto* pb_path = pslot->add_all_access_paths();

        convert_to_protobuf_column_access_path(path, pb_path);

    }

    for (const auto& path : _predicate_access_paths) {

        auto* pb_path = pslot->add_predicate_access_paths();

        convert_to_protobuf_column_access_path(path, pb_path);

    }

}

DataTypePtr SlotDescriptor::get_data_type_ptr() const {

    return get_data_type_with_default_argument(type());

}

MutableColumnPtr SlotDescriptor::get_empty_mutable_column() const {

    if (this->get_virtual_column_expr() != nullptr) {

        return ColumnNothing::create(0);

    }

    return type()->create_column();

}

bool SlotDescriptor::is_nullable() const {

    return _type->is_nullable();

}

PrimitiveType SlotDescriptor::col_type() const {

    return _type->get_primitive_type();

}

std::string SlotDescriptor::debug_string() const {

    const bool is_virtual = this->get_virtual_column_expr() != nullptr;

    return fmt::format(

            "SlotDescriptor(id={}, type={}, col_name={}, col_unique_id={}, "

            "is_virtual={})",

            _id, _type->get_name(), _col_name, _col_unique_id, is_virtual);

}

TableDescriptor::TableDescriptor(const TTableDescriptor& tdesc)

        : _table_type(tdesc.tableType),

          _name(tdesc.tableName),

          _database(tdesc.dbName),

          _table_id(tdesc.id),

          _num_cols(tdesc.numCols),

          _num_clustering_cols(tdesc.numClusteringCols) {}

std::string TableDescriptor::debug_string() const {

    std::stringstream out;

    out << "#cols=" << _num_cols << " #clustering_cols=" << _num_clustering_cols;

    return out.str();

}

OlapTableDescriptor::OlapTableDescriptor(const TTableDescriptor& tdesc) : TableDescriptor(tdesc) {}

std::string OlapTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "OlapTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

DictionaryTableDescriptor::DictionaryTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc) {}

std::string DictionaryTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "Dictionary(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

SchemaTableDescriptor::SchemaTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc), _schema_table_type(tdesc.schemaTable.tableType) {}

SchemaTableDescriptor::~SchemaTableDescriptor() = default;

std::string SchemaTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "SchemaTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

BrokerTableDescriptor::BrokerTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc) {}

BrokerTableDescriptor::~BrokerTableDescriptor() = default;

std::string BrokerTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "BrokerTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

HiveTableDescriptor::HiveTableDescriptor(const TTableDescriptor& tdesc) : TableDescriptor(tdesc) {}

HiveTableDescriptor::~HiveTableDescriptor() = default;

std::string HiveTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "HiveTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

IcebergTableDescriptor::IcebergTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc) {}

IcebergTableDescriptor::~IcebergTableDescriptor() = default;

std::string IcebergTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "IcebergTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

MaxComputeTableDescriptor::MaxComputeTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc),

          _region(tdesc.mcTable.region),

          _project(tdesc.mcTable.project),

          _table(tdesc.mcTable.table),

          _odps_url(tdesc.mcTable.odps_url),

          _tunnel_url(tdesc.mcTable.tunnel_url),

          _access_key(tdesc.mcTable.access_key),

          _secret_key(tdesc.mcTable.secret_key),

          _public_access(tdesc.mcTable.public_access) {

    if (tdesc.mcTable.__isset.endpoint) {

        _endpoint = tdesc.mcTable.endpoint;

    } else {

        _init_status = Status::InvalidArgument(

                "fail to init MaxComputeTableDescriptor, missing endpoint.");

    }

    if (tdesc.mcTable.__isset.quota) {

        _quota = tdesc.mcTable.quota;

    } else {

        _init_status =

                Status::InvalidArgument("fail to init MaxComputeTableDescriptor, missing quota.");

    }

    if (tdesc.mcTable.__isset.properties) [[likely]] {

        _props = tdesc.mcTable.properties;

    } else {

        static const std::string MC_ACCESS_KEY = "mc.access_key";

        static const std::string MC_SECRET_KEY = "mc.secret_key";

        _props.insert({MC_ACCESS_KEY, _access_key});

        _props.insert({MC_SECRET_KEY, _secret_key});

    }

}

MaxComputeTableDescriptor::~MaxComputeTableDescriptor() = default;

std::string MaxComputeTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "MaxComputeTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

TrinoConnectorTableDescriptor::TrinoConnectorTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc) {}

TrinoConnectorTableDescriptor::~TrinoConnectorTableDescriptor() = default;

std::string TrinoConnectorTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "TrinoConnectorTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

EsTableDescriptor::EsTableDescriptor(const TTableDescriptor& tdesc) : TableDescriptor(tdesc) {}

EsTableDescriptor::~EsTableDescriptor() = default;

std::string EsTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "EsTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

MySQLTableDescriptor::MySQLTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc),

          _mysql_db(tdesc.mysqlTable.db),

          _mysql_table(tdesc.mysqlTable.table),

          _host(tdesc.mysqlTable.host),

          _port(tdesc.mysqlTable.port),

          _user(tdesc.mysqlTable.user),

          _passwd(tdesc.mysqlTable.passwd),

          _charset(tdesc.mysqlTable.charset) {}

std::string MySQLTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "MySQLTable(" << TableDescriptor::debug_string() << " _db" << _mysql_db

        << " table=" << _mysql_table << " host=" << _host << " port=" << _port << " user=" << _user

        << " passwd=" << _passwd << " charset=" << _charset;

    return out.str();

}

JdbcTableDescriptor::JdbcTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc),

          _jdbc_catalog_id(tdesc.jdbcTable.catalog_id),

          _jdbc_resource_name(tdesc.jdbcTable.jdbc_resource_name),

          _jdbc_driver_url(tdesc.jdbcTable.jdbc_driver_url),

          _jdbc_driver_class(tdesc.jdbcTable.jdbc_driver_class),

          _jdbc_driver_checksum(tdesc.jdbcTable.jdbc_driver_checksum),

          _jdbc_url(tdesc.jdbcTable.jdbc_url),

          _jdbc_table_name(tdesc.jdbcTable.jdbc_table_name),

          _jdbc_user(tdesc.jdbcTable.jdbc_user),

          _jdbc_passwd(tdesc.jdbcTable.jdbc_password),

          _connection_pool_min_size(tdesc.jdbcTable.connection_pool_min_size),

          _connection_pool_max_size(tdesc.jdbcTable.connection_pool_max_size),

          _connection_pool_max_wait_time(tdesc.jdbcTable.connection_pool_max_wait_time),

          _connection_pool_max_life_time(tdesc.jdbcTable.connection_pool_max_life_time),

          _connection_pool_keep_alive(tdesc.jdbcTable.connection_pool_keep_alive) {}

std::string JdbcTableDescriptor::debug_string() const {

    fmt::memory_buffer buf;

    fmt::format_to(

            buf,

            "JDBCTable({} ,_jdbc_catalog_id = {}, _jdbc_resource_name={} ,_jdbc_driver_url={} "

            ",_jdbc_driver_class={} ,_jdbc_driver_checksum={} ,_jdbc_url={} "

            ",_jdbc_table_name={} ,_jdbc_user={} ,_jdbc_passwd={} ,_connection_pool_min_size={} "

            ",_connection_pool_max_size={} ,_connection_pool_max_wait_time={} "

            ",_connection_pool_max_life_time={} ,_connection_pool_keep_alive={})",

            TableDescriptor::debug_string(), _jdbc_catalog_id, _jdbc_resource_name,

            _jdbc_driver_url, _jdbc_driver_class, _jdbc_driver_checksum, _jdbc_url,

            _jdbc_table_name, _jdbc_user, _jdbc_passwd, _connection_pool_min_size,

            _connection_pool_max_size, _connection_pool_max_wait_time,

            _connection_pool_max_life_time, _connection_pool_keep_alive);

    return fmt::to_string(buf);

}

RemoteDorisTableDescriptor::RemoteDorisTableDescriptor(const TTableDescriptor& tdesc)

        : TableDescriptor(tdesc) {}

RemoteDorisTableDescriptor::~RemoteDorisTableDescriptor() = default;

std::string RemoteDorisTableDescriptor::debug_string() const {

    std::stringstream out;

    out << "RemoteDorisTable(" << TableDescriptor::debug_string() << ")";

    return out.str();

}

TupleDescriptor::TupleDescriptor(const TTupleDescriptor& tdesc, bool own_slots)

        : _id(tdesc.id),

          _num_materialized_slots(0),

          _has_varlen_slots(false),

          _own_slots(own_slots) {}

TupleDescriptor::TupleDescriptor(const PTupleDescriptor& pdesc, bool own_slots)

        : _id(pdesc.id()),

          _num_materialized_slots(0),

          _has_varlen_slots(false),

          _own_slots(own_slots) {}

void TupleDescriptor::add_slot(SlotDescriptor* slot) {

    _slots.push_back(slot);

    ++_num_materialized_slots;

    if (is_complex_type(slot->type()->get_primitive_type()) ||

        is_var_len_object(slot->type()->get_primitive_type()) ||

        is_string_type(slot->type()->get_primitive_type())) {

        _has_varlen_slots = true;

    }

}

void TupleDescriptor::to_protobuf(PTupleDescriptor* ptuple) const {

    ptuple->Clear();

    ptuple->set_id(_id);

    // Useless not set

    ptuple->set_byte_size(0);

    ptuple->set_table_id(-1);

    ptuple->set_num_null_bytes(0);

}

std::string TupleDescriptor::debug_string() const {

    std::stringstream out;

    out << "Tuple(id=" << _id;

    if (_table_desc != nullptr) {

        //out << " " << _table_desc->debug_string();

    }

    out << " slots=[";

    for (size_t i = 0; i < _slots.size(); ++i) {

        if (i > 0) {

            out << ", ";

        }

        out << _slots[i]->debug_string();

    }

    out << "]";

    out << " has_varlen_slots=" << _has_varlen_slots;

    out << ")";

    return out.str();

}

int TupleDescriptor::get_column_id(SlotId slot_id) const {

    for (int column_id = 0; auto* slot : slots()) {

        if (slot->id() == slot_id) {

            return column_id;

        }

        ++column_id;

    }

    return -1;

}

RowDescriptor::RowDescriptor(const DescriptorTbl& desc_tbl,

                             const std::vector<TTupleId>& row_tuples) {

    DCHECK_GT(row_tuples.size(), 0);

    for (int row_tuple : row_tuples) {

        TupleDescriptor* tupleDesc = desc_tbl.get_tuple_descriptor(row_tuple);

        _tuple_desc_map.push_back(tupleDesc);

        DCHECK(_tuple_desc_map.back() != nullptr);

    }

}

RowDescriptor::RowDescriptor(TupleDescriptor* tuple_desc) : _tuple_desc_map(1, tuple_desc) {}

int RowDescriptor::num_slots() const {

    int count = 0;

    for (const auto* tuple_desc : _tuple_desc_map) {

        count += tuple_desc->slots().size();

    }

    return count;

}

std::string RowDescriptor::debug_string() const {

    std::stringstream ss;

    ss << "tuple_desc_map: [";

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

        ss << _tuple_desc_map[i]->debug_string();

        if (i != _tuple_desc_map.size() - 1) {

            ss << ", ";

        }

    }

    ss << "] ";

    return ss.str();

}

int RowDescriptor::get_column_id(int slot_id) const {

    int column_id_counter = 0;

    for (auto* const tuple_desc : _tuple_desc_map) {

        int tuple_column_id = tuple_desc->get_column_id(slot_id);

        if (tuple_column_id != -1) {

            return column_id_counter + tuple_column_id;

        }

        column_id_counter += tuple_desc->slots().size();

    }

    return -1;

}

Status DescriptorTbl::create(ObjectPool* pool, const TDescriptorTable& thrift_tbl,

                             DescriptorTbl** tbl) {

    *tbl = pool->add(new DescriptorTbl());

    // deserialize table descriptors first, they are being referenced by tuple descriptors

    for (const auto& tdesc : thrift_tbl.tableDescriptors) {

        TableDescriptor* desc = nullptr;

        switch (tdesc.tableType) {

        case TTableType::MYSQL_TABLE:

            desc = pool->add(new MySQLTableDescriptor(tdesc));

            break;

        case TTableType::OLAP_TABLE:

            desc = pool->add(new OlapTableDescriptor(tdesc));

            break;

        case TTableType::SCHEMA_TABLE:

            desc = pool->add(new SchemaTableDescriptor(tdesc));

            break;

        case TTableType::BROKER_TABLE:

            desc = pool->add(new BrokerTableDescriptor(tdesc));

            break;

        case TTableType::ES_TABLE:

            desc = pool->add(new EsTableDescriptor(tdesc));

            break;

        case TTableType::HIVE_TABLE:

            desc = pool->add(new HiveTableDescriptor(tdesc));

            break;

        case TTableType::ICEBERG_TABLE:

            desc = pool->add(new IcebergTableDescriptor(tdesc));

            break;

        case TTableType::JDBC_TABLE:

            desc = pool->add(new JdbcTableDescriptor(tdesc));

            break;

        case TTableType::MAX_COMPUTE_TABLE:

            desc = pool->add(new MaxComputeTableDescriptor(tdesc));

            break;

        case TTableType::TRINO_CONNECTOR_TABLE:

            desc = pool->add(new TrinoConnectorTableDescriptor(tdesc));

            break;

        case TTableType::DICTIONARY_TABLE:

            desc = pool->add(new DictionaryTableDescriptor(tdesc));

            break;

        case TTableType::REMOTE_DORIS_TABLE:

            desc = pool->add(new RemoteDorisTableDescriptor(tdesc));

            break;

        default:

            DCHECK(false) << "invalid table type: " << tdesc.tableType;

        }

        (*tbl)->_tbl_desc_map[static_cast<int32_t>(tdesc.id)] = desc;

    }

    for (const auto& tdesc : thrift_tbl.tupleDescriptors) {

        TupleDescriptor* desc = pool->add(new TupleDescriptor(tdesc));

        // fix up table pointer

        if (tdesc.__isset.tableId) {

            desc->_table_desc = (*tbl)->get_table_descriptor(static_cast<int32_t>(tdesc.tableId));

            DCHECK(desc->_table_desc != nullptr);

        }

        (*tbl)->_tuple_desc_map[tdesc.id] = desc;

        (*tbl)->_row_tuples.emplace_back(tdesc.id);

    }

    for (const auto& tdesc : thrift_tbl.slotDescriptors) {

        SlotDescriptor* slot_d = pool->add(new SlotDescriptor(tdesc));

        (*tbl)->_slot_desc_map[tdesc.id] = slot_d;

        // link to parent

        auto entry = (*tbl)->_tuple_desc_map.find(tdesc.parent);

        if (entry == (*tbl)->_tuple_desc_map.end()) {

            return Status::InternalError("unknown tid in slot descriptor msg");

        }

        entry->second->add_slot(slot_d);

    }

    return Status::OK();

}

TableDescriptor* DescriptorTbl::get_table_descriptor(TableId id) const {

    // TODO: is there some boost function to do exactly this?

    auto i = _tbl_desc_map.find(id);

    if (i == _tbl_desc_map.end()) {

        return nullptr;

    } else {

        return i->second;

    }

}

TupleDescriptor* DescriptorTbl::get_tuple_descriptor(TupleId id) const {

    // TODO: is there some boost function to do exactly this?

    auto i = _tuple_desc_map.find(id);

    if (i == _tuple_desc_map.end()) {

        return nullptr;

    } else {

        return i->second;

    }

}

SlotDescriptor* DescriptorTbl::get_slot_descriptor(SlotId id) const {

    // TODO: is there some boost function to do exactly this?

    auto i = _slot_desc_map.find(id);

    if (i == _slot_desc_map.end()) {

        return nullptr;

    } else {

        return i->second;

    }

}

std::string DescriptorTbl::debug_string() const {

    std::stringstream out;

    out << "tuples:\n";

    for (auto i : _tuple_desc_map) {

        out << i.second->debug_string() << '\n';

    }

    return out.str();

}

} // namespace doris