// 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 "load/delta_writer/push_handler.h"

#include <fmt/core.h>

#include <gen_cpp/AgentService_types.h>

#include <gen_cpp/Descriptors_types.h>

#include <gen_cpp/MasterService_types.h>

#include <gen_cpp/PaloInternalService_types.h>

#include <gen_cpp/PlanNodes_types.h>

#include <gen_cpp/Types_types.h>

#include <gen_cpp/olap_file.pb.h>

#include <gen_cpp/types.pb.h>

#include <glog/logging.h>

#include <algorithm>

#include <iostream>

#include <mutex>

#include <new>

#include <queue>

#include <shared_mutex>

#include <type_traits>

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

#include "common/config.h"

#include "common/logging.h"

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_with_type_and_name.h"

#include "core/data_type/data_type_bitmap.h"

#include "core/data_type/data_type_factory.hpp"

#include "core/data_type/data_type_nullable.h"

#include "exprs/function/function_helpers.h"

#include "exprs/function/simple_function_factory.h"

#include "exprs/vexpr_context.h"

#include "format/parquet/vparquet_reader.h"

#include "io/hdfs_builder.h"

#include "runtime/descriptors.h"

#include "runtime/exec_env.h"

#include "storage/compaction/cumulative_compaction_time_series_policy.h"

#include "storage/delete/delete_handler.h"

#include "storage/olap_define.h"

#include "storage/rowset/pending_rowset_helper.h"

#include "storage/rowset/rowset_writer.h"

#include "storage/rowset/rowset_writer_context.h"

#include "storage/storage_engine.h"

#include "storage/tablet/tablet.h"

#include "storage/tablet/tablet_manager.h"

#include "storage/tablet/tablet_schema.h"

#include "storage/txn/txn_manager.h"

#include "util/time.h"

namespace doris {

using namespace ErrorCode;

// Process push command, the main logical is as follows:

//    a. related tablets not exist:

//        current table isn't in schemachange state, only push for current

//        tablet

//    b. related tablets exist

//       I.  current tablet is old table (cur.creation_time <

//       related.creation_time):

//           push for current table and than convert data for related tables

//       II. current table is new table:

//           this usually means schema change is over,

//           clear schema change info in both current tablet and related

//           tablets, finally we will only push for current tablets. this is

//           very useful in rollup action.

Status PushHandler::process_streaming_ingestion(TabletSharedPtr tablet, const TPushReq& request,

                                                PushType push_type,

                                                std::vector<TTabletInfo>* tablet_info_vec) {

    LOG(INFO) << "begin to realtime push. tablet=" << tablet->tablet_id()

              << ", transaction_id=" << request.transaction_id;

    Status res = Status::OK();

    _request = request;

    RETURN_IF_ERROR(DescriptorTbl::create(&_pool, _request.desc_tbl, &_desc_tbl));

    res = _do_streaming_ingestion(tablet, request, push_type, tablet_info_vec);

    if (res.ok()) {

        if (tablet_info_vec != nullptr) {

            TTabletInfo tablet_info;

            tablet_info.tablet_id = tablet->tablet_id();

            tablet_info.schema_hash = tablet->schema_hash();

            RETURN_IF_ERROR(_engine.tablet_manager()->report_tablet_info(&tablet_info));

            tablet_info_vec->push_back(tablet_info);

        }

        LOG(INFO) << "process realtime push successfully. "

                  << "tablet=" << tablet->tablet_id() << ", partition_id=" << request.partition_id

                  << ", transaction_id=" << request.transaction_id;

    }

    return res;

}

Status PushHandler::_do_streaming_ingestion(TabletSharedPtr tablet, const TPushReq& request,

                                            PushType push_type,

                                            std::vector<TTabletInfo>* tablet_info_vec) {

    // add transaction in engine, then check sc status

    // lock, prevent sc handler checking transaction concurrently

    if (tablet == nullptr) {

        return Status::Error<TABLE_NOT_FOUND>(

                "PushHandler::_do_streaming_ingestion input tablet is nullptr");

    }

    PUniqueId load_id;

    load_id.set_hi(0);

    load_id.set_lo(0);

    RETURN_IF_ERROR(

            tablet->prepare_txn(request.partition_id, request.transaction_id, load_id, false));

    // not call validate request here, because realtime load does not

    // contain version info

    Status res;

    // check delete condition if push for delete

    std::queue<DeletePredicatePB> del_preds;

    if (push_type == PushType::PUSH_FOR_DELETE) {

        DeletePredicatePB del_pred;

        TabletSchema tablet_schema;

        tablet_schema.copy_from(*tablet->tablet_schema());

        if (!request.columns_desc.empty() && request.columns_desc[0].col_unique_id >= 0) {

            tablet_schema.clear_columns();

            for (const auto& column_desc : request.columns_desc) {

                tablet_schema.append_column(TabletColumn(column_desc));

            }

        }

        res = DeleteHandler::generate_delete_predicate(tablet_schema, request.delete_conditions,

                                                       &del_pred);

        del_preds.push(del_pred);

        if (!res.ok()) {

            LOG(WARNING) << "fail to generate delete condition. res=" << res

                         << ", tablet=" << tablet->tablet_id();

            return res;

        }

    }

    int32_t max_version_config = tablet->max_version_config();

    // check if version number exceed limit

    if (tablet->exceed_version_limit(max_version_config)) {

        return Status::Status::Error<TOO_MANY_VERSION>(

                "failed to push data. version count: {}, exceed limit: {}, tablet: {}. Please "

                "reduce the frequency of loading data or adjust the max_tablet_version_num or "

                "time_series_max_tablet_version_num in "

                "be.conf to a larger value.",

                tablet->version_count(), max_version_config, tablet->tablet_id());

    }

    auto version_count = tablet->version_count() + tablet->stale_version_count();

    if (tablet->avg_rs_meta_serialize_size() * version_count >

        config::tablet_meta_serialize_size_limit) {

        return Status::Error<TOO_MANY_VERSION>(

                "failed to init rowset builder. meta serialize size : {}, exceed limit: {}, "

                "tablet: {}. Please reduce the frequency of loading data or adjust the "

                "max_tablet_version_num in be.conf to a larger value.",

                tablet->avg_rs_meta_serialize_size() * version_count,

                config::tablet_meta_serialize_size_limit, tablet->tablet_id());

    }

    auto tablet_schema = std::make_shared<TabletSchema>();

    tablet_schema->copy_from(*tablet->tablet_schema());

    if (!request.columns_desc.empty() && request.columns_desc[0].col_unique_id >= 0) {

        tablet_schema->clear_columns();

        // TODO(lhy) handle variant

        for (const auto& column_desc : request.columns_desc) {

            tablet_schema->append_column(TabletColumn(column_desc));

        }

    }

    RowsetSharedPtr rowset_to_add;

    // writes

    res = _convert_v2(tablet, &rowset_to_add, tablet_schema, push_type);

    if (!res.ok()) {

        LOG(WARNING) << "fail to convert tmp file when realtime push. res=" << res

                     << ", failed to process realtime push."

                     << ", tablet=" << tablet->tablet_id()

                     << ", transaction_id=" << request.transaction_id;

        Status rollback_status = _engine.txn_manager()->rollback_txn(request.partition_id, *tablet,

                                                                     request.transaction_id);

        // has to check rollback status to ensure not delete a committed rowset

        if (rollback_status.ok()) {

            _engine.add_unused_rowset(rowset_to_add);

        }

        return res;

    }

    // add pending data to tablet

    if (push_type == PushType::PUSH_FOR_DELETE) {

        rowset_to_add->rowset_meta()->set_delete_predicate(std::move(del_preds.front()));

        del_preds.pop();

    }

    // Transfer ownership of `PendingRowsetGuard` to `TxnManager`

    Status commit_status = _engine.txn_manager()->commit_txn(

            request.partition_id, *tablet, request.transaction_id, load_id, rowset_to_add,

            std::move(_pending_rs_guard), false);

    if (!commit_status.ok() && !commit_status.is<PUSH_TRANSACTION_ALREADY_EXIST>()) {

        res = std::move(commit_status);

    }

    return res;

}

Status PushHandler::_convert_v2(TabletSharedPtr cur_tablet, RowsetSharedPtr* cur_rowset,

                                TabletSchemaSPtr tablet_schema, PushType push_type) {

    Status st = Status::OK();

    uint32_t num_rows = 0;

    PUniqueId load_id;

    load_id.set_hi(0);

    load_id.set_lo(0);

    do {

        VLOG_NOTICE << "start to convert delta file.";

        // 1. init RowsetBuilder of cur_tablet for current push

        VLOG_NOTICE << "init rowset builder. tablet=" << cur_tablet->tablet_id()

                    << ", block_row_size=" << tablet_schema->num_rows_per_row_block();

        // although the spark load output files are fully sorted,

        // but it depends on thirparty implementation, so we conservatively

        // set this value to OVERLAP_UNKNOWN

        RowsetWriterContext context;

        context.txn_id = _request.transaction_id;

        context.load_id = load_id;

        context.rowset_state = PREPARED;

        context.segments_overlap = OVERLAP_UNKNOWN;

        context.tablet_schema = tablet_schema;

        context.newest_write_timestamp = UnixSeconds();

        auto rowset_writer = DORIS_TRY(cur_tablet->create_rowset_writer(context, false));

        _pending_rs_guard = _engine.pending_local_rowsets().add(context.rowset_id);

        // 2. Init PushBrokerReader to read broker file if exist,

        //    in case of empty push this will be skipped.

        std::string path;

        // If it is push delete, the broker_scan_range is not set.

        if (push_type == PushType::PUSH_NORMAL_V2) {

            path = _request.broker_scan_range.ranges[0].path;

            LOG(INFO) << "tablet=" << cur_tablet->tablet_id() << ", file path=" << path

                      << ", file size=" << _request.broker_scan_range.ranges[0].file_size;

        }

        // For push load, this tablet maybe not need push data, so that the path maybe empty

        if (!path.empty()) {

            // init Reader

            std::unique_ptr<PushBrokerReader> reader =

                    PushBrokerReader::create_unique(_request.broker_scan_range, _request.desc_tbl);

            st = reader->init();

            if (reader == nullptr || !st.ok()) {

                st = Status::Error<PUSH_INIT_ERROR>("fail to init reader. st={}, tablet={}", st,

                                                    cur_tablet->tablet_id());

                break;

            }

            // 3. Init Block

            Block block;

            // 4. Read data from broker and write into cur_tablet

            VLOG_NOTICE << "start to convert etl file to delta.";

            while (!reader->eof()) {

                st = reader->next(&block);

                if (!st.ok()) {

                    LOG(WARNING) << "read next row failed."

                                 << " st=" << st << " read_rows=" << num_rows;

                    break;

                } else {

                    if (reader->eof()) {

                        break;

                    }

                    if (!(st = rowset_writer->add_block(&block)).ok()) {

                        LOG(WARNING) << "fail to attach block to rowset_writer. "

                                     << "st=" << st << ", tablet=" << cur_tablet->tablet_id()

                                     << ", read_rows=" << num_rows;

                        break;

                    }

                    num_rows++;

                }

            }

            reader->print_profile();

            RETURN_IF_ERROR(reader->close());

        }

        if (!st.ok()) {

            break;

        }

        if (!(st = rowset_writer->flush()).ok()) {

            LOG(WARNING) << "failed to finalize writer";

            break;

        }

        if (!(st = rowset_writer->build(*cur_rowset)).ok()) {

            LOG(WARNING) << "failed to build rowset";

            break;

        }

        _write_bytes += (*cur_rowset)->data_disk_size();

        _write_rows += (*cur_rowset)->num_rows();

    } while (false);

    VLOG_TRACE << "convert delta file end. st=" << st << ", tablet=" << cur_tablet->tablet_id()

               << ", processed_rows" << num_rows;

    return st;

}

PushBrokerReader::PushBrokerReader(const TBrokerScanRange& t_scan_range,

                                   const TDescriptorTable& t_desc_tbl)

        : _ready(false),

          _eof(false),

          _next_range(0),

          _t_desc_tbl(t_desc_tbl),

          _cur_reader_eof(false),

          _params(t_scan_range.params),

          _ranges(t_scan_range.ranges) {

    // change broker params to file params

    if (_ranges.empty()) {

        return;

    }

    _file_params.format_type = _ranges[0].format_type;

    _file_params.src_tuple_id = _params.src_tuple_id;

    _file_params.dest_tuple_id = _params.dest_tuple_id;

    _file_params.num_of_columns_from_file = _ranges[0].num_of_columns_from_file;

    _file_params.properties = _params.properties;

    _file_params.expr_of_dest_slot = _params.expr_of_dest_slot;

    _file_params.dest_sid_to_src_sid_without_trans = _params.dest_sid_to_src_sid_without_trans;

    _file_params.strict_mode = _params.strict_mode;

    if (_ranges[0].file_type == TFileType::FILE_HDFS) {

        _file_params.hdfs_params = parse_properties(_params.properties);

    } else {

        _file_params.__isset.broker_addresses = true;

        _file_params.broker_addresses = t_scan_range.broker_addresses;

    }

    for (const auto& range : _ranges) {

        TFileRangeDesc file_range;

        // TODO(cmy): in previous implementation, the file_type is set in _file_params

        // and it use _ranges[0].file_type.

        // Later, this field is moved to TFileRangeDesc, but here we still only use _ranges[0]'s

        // file_type.

        // Because I don't know if other range has this field, so just keep it same as before.

        file_range.__set_file_type(_ranges[0].file_type);

        file_range.__set_load_id(range.load_id);

        file_range.__set_path(range.path);

        file_range.__set_start_offset(range.start_offset);

        file_range.__set_size(range.size);

        file_range.__set_file_size(range.file_size);

        file_range.__set_columns_from_path(range.columns_from_path);

        _file_ranges.push_back(file_range);

    }

}

Status PushBrokerReader::init() {

    // init runtime state, runtime profile, counter

    TUniqueId dummy_id;

    dummy_id.hi = 0;

    dummy_id.lo = 0;

    TPlanFragmentExecParams params;

    params.fragment_instance_id = dummy_id;

    params.query_id = dummy_id;

    TQueryOptions query_options;

    TQueryGlobals query_globals;

    std::shared_ptr<MemTrackerLimiter> tracker = MemTrackerLimiter::create_shared(

            MemTrackerLimiter::Type::LOAD,

            fmt::format("PushBrokerReader:dummy_id={}", print_id(dummy_id)));

    _runtime_state = RuntimeState::create_unique(params, query_options, query_globals,

                                                 ExecEnv::GetInstance(), nullptr, tracker);

    DescriptorTbl* desc_tbl = nullptr;

    Status status = DescriptorTbl::create(_runtime_state->obj_pool(), _t_desc_tbl, &desc_tbl);

    if (UNLIKELY(!status.ok())) {

        return Status::Error<PUSH_INIT_ERROR>("Failed to create descriptor table, msg: {}", status);

    }

    _runtime_state->set_desc_tbl(desc_tbl);

    _runtime_profile = _runtime_state->runtime_profile();

    _runtime_profile->set_name("PushBrokerReader");

    _file_cache_statistics.reset(new io::FileCacheStatistics());

    _file_reader_stats.reset(new io::FileReaderStats());

    _io_ctx.reset(new io::IOContext());

    _io_ctx->file_cache_stats = _file_cache_statistics.get();

    _io_ctx->file_reader_stats = _file_reader_stats.get();

    _io_ctx->query_id = &_runtime_state->query_id();

    auto slot_descs = desc_tbl->get_tuple_descriptor(0)->slots();

    uint32_t idx = 0;

    for (auto& slot_desc : slot_descs) {

        _all_col_names.push_back(to_lower((slot_desc->col_name())));

        _col_name_to_block_idx.insert({to_lower(slot_desc->col_name()), idx++});

    }

    RETURN_IF_ERROR(_init_expr_ctxes());

    _ready = true;

    return Status::OK();

}

Status PushBrokerReader::next(Block* block) {

    if (!_ready || block == nullptr) {

        return Status::Error<INVALID_ARGUMENT>("PushBrokerReader not ready or block is nullptr");

    }

    if (_cur_reader == nullptr || _cur_reader_eof) {

        RETURN_IF_ERROR(_get_next_reader());

        if (_eof) {

            return Status::OK();

        }

    }

    RETURN_IF_ERROR(_init_src_block());

    size_t read_rows = 0;

    RETURN_IF_ERROR(_cur_reader->get_next_block(_src_block_ptr, &read_rows, &_cur_reader_eof));

    if (read_rows > 0) {

        RETURN_IF_ERROR(_cast_to_input_block());

        RETURN_IF_ERROR(_convert_to_output_block(block));

    }

    return Status::OK();

}

Status PushBrokerReader::close() {

    _ready = false;

    return Status::OK();

}

Status PushBrokerReader::_init_src_block() {

    _src_block.clear();

    int idx = 0;

    for (auto& slot : _src_slot_descs) {

        DataTypePtr data_type;

        auto it = _name_to_col_type.find(slot->col_name());

        if (it == _name_to_col_type.end()) {

            // not exist in file, using type from _input_tuple_desc

            data_type = slot->get_data_type_ptr();

        } else {

            data_type = it->second;

        }

        if (data_type == nullptr) {

            return Status::NotSupported("Not support data type {} for column {}",

                                        it == _name_to_col_type.end() ? slot->type()->get_name()

                                                                      : it->second->get_name(),

                                        slot->col_name());

        }

        MutableColumnPtr data_column = data_type->create_column();

        _src_block.insert(

                ColumnWithTypeAndName(std::move(data_column), data_type, slot->col_name()));

        _src_block_name_to_idx.emplace(slot->col_name(), idx++);

    }

    _src_block_ptr = &_src_block;

    return Status::OK();

}

Status PushBrokerReader::_cast_to_input_block() {

    uint32_t idx = 0;

    for (auto& slot_desc : _src_slot_descs) {

        if (_name_to_col_type.find(slot_desc->col_name()) == _name_to_col_type.end()) {

            continue;

        }

        if (slot_desc->type()->get_primitive_type() == PrimitiveType::TYPE_VARIANT) {

            continue;

        }

        // remove nullable here, let the get_function decide whether nullable

        auto return_type = slot_desc->get_data_type_ptr();

        idx = _src_block_name_to_idx[slot_desc->col_name()];

        auto& arg = _src_block_ptr->get_by_position(idx);

        // bitmap convert：src -> to_base64 -> bitmap_from_base64

        if (slot_desc->type()->get_primitive_type() == TYPE_BITMAP) {

            auto base64_return_type = DataTypeFactory::instance().create_data_type(

                    PrimitiveType::TYPE_STRING, slot_desc->is_nullable());

            auto func_to_base64 = SimpleFunctionFactory::instance().get_function(

                    "to_base64", {arg}, base64_return_type);

            RETURN_IF_ERROR(func_to_base64->execute(nullptr, *_src_block_ptr, {idx}, idx,

                                                    arg.column->size()));

            _src_block_ptr->get_by_position(idx).type = std::move(base64_return_type);

            auto& arg_base64 = _src_block_ptr->get_by_position(idx);

            auto func_bitmap_from_base64 = SimpleFunctionFactory::instance().get_function(

                    "bitmap_from_base64", {arg_base64}, return_type);

            RETURN_IF_ERROR(func_bitmap_from_base64->execute(nullptr, *_src_block_ptr, {idx}, idx,

                                                             arg_base64.column->size()));

            _src_block_ptr->get_by_position(idx).type = std::move(return_type);

        } else {

            ColumnsWithTypeAndName arguments {

                    arg,

                    {DataTypeString().create_column_const(

                             arg.column->size(),

                             Field::create_field<TYPE_STRING>(

                                     is_decimal(return_type->get_primitive_type())

                                             ? "Decimal"

                                             : remove_nullable(return_type)->get_family_name())),

                     std::make_shared<DataTypeString>(), ""}};

            auto func_cast =

                    SimpleFunctionFactory::instance().get_function("CAST", arguments, return_type);

            RETURN_IF_ERROR(

                    func_cast->execute(nullptr, *_src_block_ptr, {idx}, idx, arg.column->size()));

            _src_block_ptr->get_by_position(idx).type = std::move(return_type);

        }

    }

    return Status::OK();

}

Status PushBrokerReader::_convert_to_output_block(Block* block) {

    block->clear();

    int ctx_idx = 0;

    size_t rows = _src_block.rows();

    auto filter_column = ColumnUInt8::create(rows, 1);

    for (auto* slot_desc : _dest_tuple_desc->slots()) {

        int dest_index = ctx_idx++;

        ColumnPtr column_ptr;

        auto& ctx = _dest_expr_ctxs[dest_index];

        // PT1 => dest primitive type

        RETURN_IF_ERROR(ctx->execute(&_src_block, column_ptr));

        // column_ptr maybe a ColumnConst, convert it to a normal column

        column_ptr = column_ptr->convert_to_full_column_if_const();

        DCHECK(column_ptr);

        // because of src_slot_desc is always be nullable, so the column_ptr after do dest_expr

        // is likely to be nullable

        if (LIKELY(column_ptr->is_nullable())) {

            if (!slot_desc->is_nullable()) {

                column_ptr = remove_nullable(column_ptr);

            }

        } else if (slot_desc->is_nullable()) {

            column_ptr = make_nullable(column_ptr);

        }

        block->insert(dest_index, ColumnWithTypeAndName(column_ptr, slot_desc->get_data_type_ptr(),

                                                        slot_desc->col_name()));

    }

    _src_block.clear();

    size_t dest_size = block->columns();

    block->insert(ColumnWithTypeAndName(std::move(filter_column), std::make_shared<DataTypeUInt8>(),

                                        "filter column"));

    RETURN_IF_ERROR(Block::filter_block(block, dest_size, dest_size));

    return Status::OK();

}

void PushBrokerReader::print_profile() {

    std::stringstream ss;

    _runtime_profile->pretty_print(&ss);

    LOG(INFO) << ss.str();

}

Status PushBrokerReader::_init_expr_ctxes() {

    // Construct _src_slot_descs

    const TupleDescriptor* src_tuple_desc =

            _runtime_state->desc_tbl().get_tuple_descriptor(_params.src_tuple_id);

    if (src_tuple_desc == nullptr) {

        return Status::InternalError("Unknown source tuple descriptor, tuple_id={}",

                                     _params.src_tuple_id);

    }

    std::map<SlotId, SlotDescriptor*> src_slot_desc_map;

    std::unordered_map<SlotDescriptor*, int> src_slot_desc_to_index {};

    for (size_t i = 0, len = src_tuple_desc->slots().size(); i < len; ++i) {

        auto* slot_desc = src_tuple_desc->slots()[i];

        src_slot_desc_to_index.emplace(slot_desc, i);

        src_slot_desc_map.emplace(slot_desc->id(), slot_desc);

    }

    for (auto slot_id : _params.src_slot_ids) {

        auto it = src_slot_desc_map.find(slot_id);

        if (it == std::end(src_slot_desc_map)) {

            return Status::InternalError("Unknown source slot descriptor, slot_id={}", slot_id);

        }

        _src_slot_descs.emplace_back(it->second);

    }

    _row_desc.reset(new RowDescriptor(_runtime_state->desc_tbl(),

                                      std::vector<TupleId>({_params.src_tuple_id})));

    if (!_pre_filter_texprs.empty()) {

        DCHECK(_pre_filter_texprs.size() == 1);

        RETURN_IF_ERROR(VExpr::create_expr_tree(_pre_filter_texprs[0], _pre_filter_ctx_ptr));

        RETURN_IF_ERROR(_pre_filter_ctx_ptr->prepare(_runtime_state.get(), *_row_desc));

        RETURN_IF_ERROR(_pre_filter_ctx_ptr->open(_runtime_state.get()));

    }

    _dest_tuple_desc = _runtime_state->desc_tbl().get_tuple_descriptor(_params.dest_tuple_id);

    if (_dest_tuple_desc == nullptr) {

        return Status::InternalError("Unknown dest tuple descriptor, tuple_id={}",

                                     _params.dest_tuple_id);

    }

    bool has_slot_id_map = _params.__isset.dest_sid_to_src_sid_without_trans;

    for (auto slot_desc : _dest_tuple_desc->slots()) {

        auto it = _params.expr_of_dest_slot.find(slot_desc->id());

        if (it == std::end(_params.expr_of_dest_slot)) {

            return Status::InternalError("No expr for dest slot, id={}, name={}", slot_desc->id(),

                                         slot_desc->col_name());

        }

        VExprContextSPtr ctx;

        RETURN_IF_ERROR(VExpr::create_expr_tree(it->second, ctx));

        RETURN_IF_ERROR(ctx->prepare(_runtime_state.get(), *_row_desc.get()));

        RETURN_IF_ERROR(ctx->open(_runtime_state.get()));

        _dest_expr_ctxs.emplace_back(ctx);

        if (has_slot_id_map) {

            auto it1 = _params.dest_sid_to_src_sid_without_trans.find(slot_desc->id());

            if (it1 == std::end(_params.dest_sid_to_src_sid_without_trans)) {

                _src_slot_descs_order_by_dest.emplace_back(nullptr);

            } else {

                auto _src_slot_it = src_slot_desc_map.find(it1->second);

                if (_src_slot_it == std::end(src_slot_desc_map)) {

                    return Status::InternalError("No src slot {} in src slot descs", it1->second);

                }

                _dest_slot_to_src_slot_index.emplace(_src_slot_descs_order_by_dest.size(),

                                                     src_slot_desc_to_index[_src_slot_it->second]);

                _src_slot_descs_order_by_dest.emplace_back(_src_slot_it->second);

            }

        }

    }

    return Status::OK();

}

Status PushBrokerReader::_get_next_reader() {

    _cur_reader.reset(nullptr);

    if (_next_range >= _file_ranges.size()) {

        _eof = true;

        return Status::OK();

    }

    const TFileRangeDesc& range = _file_ranges[_next_range++];

    Status init_status;

    switch (_file_params.format_type) {

    case TFileFormatType::FORMAT_PARQUET: {

        std::unique_ptr<ParquetReader> parquet_reader = ParquetReader::create_unique(

                _runtime_profile, _file_params, range, _runtime_state->query_options().batch_size,

                &_runtime_state->timezone_obj(), _io_ctx.get(), _runtime_state.get());

        init_status = parquet_reader->init_reader(

                _all_col_names, &_col_name_to_block_idx, _push_down_exprs, _slot_id_to_predicates,

                _real_tuple_desc, _default_val_row_desc.get(), _col_name_to_slot_id,

                &_not_single_slot_filter_conjuncts, &_slot_id_to_filter_conjuncts,

                TableSchemaChangeHelper::ConstNode::get_instance(), false);

        _cur_reader = std::move(parquet_reader);

        if (!init_status.ok()) {

            return Status::InternalError("failed to init reader for file {}, err: {}", range.path,

                                         init_status.to_string());

        }

        std::unordered_map<std::string, std::tuple<std::string, const SlotDescriptor*>>

                partition_columns;

        std::unordered_map<std::string, VExprContextSPtr> missing_columns;

        RETURN_IF_ERROR(_cur_reader->get_columns(&_name_to_col_type, &_missing_cols));

        RETURN_IF_ERROR(_cur_reader->set_fill_columns(partition_columns, missing_columns));

        break;

    }

    default:

        return Status::Error<PUSH_INIT_ERROR>("Unsupported file format type: {}",

                                              _file_params.format_type);

    }

    _cur_reader_eof = false;

    return Status::OK();

}

} // namespace doris