// 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 "exec/scan/file_scanner_v2.h"

#include <gen_cpp/Exprs_types.h>

#include <gen_cpp/PlanNodes_types.h>

#include <algorithm>

#include <map>

#include <memory>

#include <optional>

#include <string>

#include <utility>

#include "common/cast_set.h"

#include "common/config.h"

#include "common/consts.h"

#include "common/status.h"

#include "core/assert_cast.h"

#include "core/block/column_with_type_and_name.h"

#include "core/column/column.h"

#include "core/data_type/data_type.h"

#include "core/data_type/data_type_nullable.h"

#include "core/data_type_serde/data_type_serde.h"

#include "core/string_ref.h"

#include "exec/common/util.hpp"

#include "exec/operator/scan_operator.h"

#include "exec/scan/access_path_parser.h"

#include "exprs/runtime_filter_expr.h"

#include "exprs/vexpr.h"

#include "exprs/vexpr_context.h"

#include "exprs/vslot_ref.h"

#include "format/format_common.h"

#include "format_v2/column_mapper.h"

#include "format_v2/jni/iceberg_sys_table_reader.h"

#include "format_v2/jni/jdbc_reader.h"

#include "format_v2/jni/max_compute_jni_reader.h"

#include "format_v2/jni/trino_connector_jni_reader.h"

#include "format_v2/table/hive_reader.h"

#include "format_v2/table/hudi_reader.h"

#include "format_v2/table/iceberg_reader.h"

#include "format_v2/table/paimon_reader.h"

#include "format_v2/table/remote_doris_reader.h"

#include "format_v2/table_reader.h"

#include "io/fs/file_meta_cache.h"

#include "io/io_common.h"

#include "runtime/descriptors.h"

#include "runtime/exec_env.h"

#include "runtime/runtime_state.h"

#include "service/backend_options.h"

#include "storage/id_manager.h"

namespace doris {

namespace {

std::string table_format_name(const TFileRangeDesc& range) {

    return range.__isset.table_format_params ? range.table_format_params.table_format_type

                                             : "NotSet";

}

TFileFormatType::type get_range_format_type(const TFileScanRangeParams& params,

                                            const TFileRangeDesc& range) {

    return range.__isset.format_type ? range.format_type : params.format_type;

}

bool is_supported_table_format(const TFileRangeDesc& range) {

    const auto table_format = table_format_name(range);

    if (table_format == "hudi" && range.__isset.table_format_params &&

        range.table_format_params.__isset.hudi_params &&

        range.table_format_params.hudi_params.__isset.delta_logs &&

        !range.table_format_params.hudi_params.delta_logs.empty()) {

        // Hudi MOR splits need log-file merge semantics and must stay on the existing JNI path.

        // FileScannerV2 currently supports native Parquet data files only.

        return false;

    }

    return table_format == "NotSet" || table_format == "tvf" || table_format == "hive" ||

           table_format == "iceberg" || table_format == "paimon" || table_format == "hudi";

}

bool is_supported_arrow_table_format(const TFileRangeDesc& range) {

    return table_format_name(range) == "remote_doris";

}

bool is_supported_jni_table_format(const TFileRangeDesc& range) {

    const auto table_format = table_format_name(range);

    if (table_format == "paimon") {

        return range.__isset.table_format_params &&

               range.table_format_params.__isset.paimon_params &&

               range.table_format_params.paimon_params.__isset.reader_type &&

               range.table_format_params.paimon_params.reader_type == TPaimonReaderType::PAIMON_JNI;

    }

    return table_format == "jdbc" || table_format == "iceberg" || table_format == "hudi" ||

           table_format == "max_compute" || table_format == "trino_connector";

}

bool is_csv_format(TFileFormatType::type format_type) {

    switch (format_type) {

    case TFileFormatType::FORMAT_CSV_PLAIN:

    case TFileFormatType::FORMAT_CSV_GZ:

    case TFileFormatType::FORMAT_CSV_BZ2:

    case TFileFormatType::FORMAT_CSV_LZ4FRAME:

    case TFileFormatType::FORMAT_CSV_LZ4BLOCK:

    case TFileFormatType::FORMAT_CSV_LZOP:

    case TFileFormatType::FORMAT_CSV_DEFLATE:

    case TFileFormatType::FORMAT_CSV_SNAPPYBLOCK:

    case TFileFormatType::FORMAT_PROTO:

        return true;

    default:

        return false;

    }

}

bool is_text_format(TFileFormatType::type format_type) {

    return format_type == TFileFormatType::FORMAT_TEXT;

}

bool is_json_format(TFileFormatType::type format_type) {

    return format_type == TFileFormatType::FORMAT_JSON;

}

bool is_native_format(TFileFormatType::type format_type) {

    return format_type == TFileFormatType::FORMAT_NATIVE;

}

bool is_partition_slot(const TFileScanSlotInfo& slot_info, const std::string& column_name) {

    if (column_name.starts_with(BeConsts::GLOBAL_ROWID_COL) ||

        column_name == BeConsts::ICEBERG_ROWID_COL) {

        return false;

    }

    return slot_info.__isset.category ? slot_info.category == TColumnCategory::PARTITION_KEY

                                      : !slot_info.is_file_slot;

}

bool is_data_file_slot(const TFileScanSlotInfo& slot_info, const std::string& column_name) {

    if (column_name.starts_with(BeConsts::GLOBAL_ROWID_COL) ||

        column_name == BeConsts::ICEBERG_ROWID_COL) {

        return false;

    }

    // CSV and other non-self-describing formats need FE slot descriptors for only the columns that

    // are physically read from the file. Partition/default/virtual columns stay in TableReader's

    // mapping layer and are materialized after the file-local block is read. New FE provides an

    // explicit category; old FE falls back to `is_file_slot`.

    if (slot_info.__isset.category) {

        return slot_info.category == TColumnCategory::REGULAR ||

               slot_info.category == TColumnCategory::GENERATED;

    }

    return slot_info.is_file_slot;

}

Status rewrite_slot_refs_to_global_index(

        VExprSPtr* expr,

        const std::unordered_map<int32_t, format::GlobalIndex>& slot_id_to_global_index) {

    DORIS_CHECK(expr != nullptr);

    if (*expr == nullptr) {

        return Status::OK();

    }

    if (auto* runtime_filter = dynamic_cast<RuntimeFilterExpr*>(expr->get());

        runtime_filter != nullptr) {

        auto impl = runtime_filter->get_impl();

        DORIS_CHECK(impl != nullptr);

        RETURN_IF_ERROR(rewrite_slot_refs_to_global_index(&impl, slot_id_to_global_index));

        runtime_filter->set_impl(std::move(impl));

        return Status::OK();

    }

    if ((*expr)->is_slot_ref()) {

        const auto* slot_ref = assert_cast<const VSlotRef*>(expr->get());

        const auto global_index_it = slot_id_to_global_index.find(slot_ref->slot_id());

        if (global_index_it == slot_id_to_global_index.end()) {

            DORIS_CHECK(slot_ref->slot_id() >= 0);

            const auto global_index = format::GlobalIndex(cast_set<size_t>(slot_ref->slot_id()));

            *expr = VSlotRef::create_shared(cast_set<int>(global_index.value()),

                                            cast_set<int>(global_index.value()), -1,

                                            slot_ref->data_type(), slot_ref->column_name());

            RETURN_IF_ERROR(expr->get()->prepare(nullptr, RowDescriptor(), nullptr));

            return Status::OK();

        }

        const auto global_index = global_index_it->second;

        *expr = VSlotRef::create_shared(cast_set<int>(global_index.value()),

                                        cast_set<int>(global_index.value()), -1,

                                        slot_ref->data_type(), slot_ref->column_name());

        RETURN_IF_ERROR(expr->get()->prepare(nullptr, RowDescriptor(), nullptr));

        return Status::OK();

    }

    auto children = (*expr)->children();

    for (auto& child : children) {

        if (child == nullptr) {

            continue;

        }

        RETURN_IF_ERROR(rewrite_slot_refs_to_global_index(&child, slot_id_to_global_index));

    }

    (*expr)->set_children(std::move(children));

    return Status::OK();

}

} // namespace

#ifdef BE_TEST

Status FileScannerV2::TEST_to_file_format(TFileFormatType::type format_type,

                                          format::FileFormat* file_format) {

    return _to_file_format(format_type, file_format);

}

bool FileScannerV2::TEST_is_partition_slot(const TFileScanSlotInfo& slot_info,

                                           const std::string& column_name) {

    return is_partition_slot(slot_info, column_name);

}

bool FileScannerV2::TEST_is_data_file_slot(const TFileScanSlotInfo& slot_info,

                                           const std::string& column_name) {

    return is_data_file_slot(slot_info, column_name);

}

Status FileScannerV2::TEST_rewrite_slot_refs_to_global_index(

        VExprSPtr* expr,

        const std::unordered_map<int32_t, format::GlobalIndex>& slot_id_to_global_index) {

    return rewrite_slot_refs_to_global_index(expr, slot_id_to_global_index);

}

#endif

bool FileScannerV2::is_supported(const TFileScanRangeParams& params, const TFileRangeDesc& range) {

    const auto format_type = get_range_format_type(params, range);

    if (format_type == TFileFormatType::FORMAT_PARQUET) {

        return is_supported_table_format(range);

    } else if (format_type == TFileFormatType::FORMAT_ARROW) {

        return is_supported_arrow_table_format(range);

    } else if (format_type == TFileFormatType::FORMAT_JNI) {

        return is_supported_jni_table_format(range);

    } else if (is_csv_format(format_type) || is_text_format(format_type) ||

               is_json_format(format_type) || is_native_format(format_type)) {

        return is_supported_table_format(range);

    } else {

        LOG(WARNING) << "Unsupported file format type " << format_type << " for file scanner v2";

        return false;

    }

}

FileScannerV2::FileScannerV2(RuntimeState* state, FileScanLocalState* local_state, int64_t limit,

                             std::shared_ptr<SplitSourceConnector> split_source,

                             RuntimeProfile* profile, ShardedKVCache* kv_cache,

                             const std::unordered_map<std::string, int>* colname_to_slot_id)

        : Scanner(state, local_state, limit, profile),

          _split_source(std::move(split_source)),

          _kv_cache(kv_cache) {

    (void)colname_to_slot_id;

    if (state->get_query_ctx() != nullptr &&

        state->get_query_ctx()->file_scan_range_params_map.count(local_state->parent_id()) > 0) {

        _params = &(state->get_query_ctx()->file_scan_range_params_map[local_state->parent_id()]);

    } else {

        _params = _split_source->get_params();

    }

}

Status FileScannerV2::init(RuntimeState* state, const VExprContextSPtrs& conjuncts) {

    RETURN_IF_ERROR(Scanner::init(state, conjuncts));

    _get_block_timer =

            ADD_TIMER_WITH_LEVEL(_local_state->scanner_profile(), "FileScannerV2GetBlockTime", 1);

    _file_counter =

            ADD_COUNTER_WITH_LEVEL(_local_state->scanner_profile(), "FileNumber", TUnit::UNIT, 1);

    _file_read_bytes_counter = ADD_COUNTER_WITH_LEVEL(_local_state->scanner_profile(),

                                                      "FileReadBytes", TUnit::BYTES, 1);

    _file_read_calls_counter = ADD_COUNTER_WITH_LEVEL(_local_state->scanner_profile(),

                                                      "FileReadCalls", TUnit::UNIT, 1);

    _file_read_time_counter =

            ADD_TIMER_WITH_LEVEL(_local_state->scanner_profile(), "FileReadTime", 1);

    _adaptive_batch_predicted_rows_counter = ADD_COUNTER_WITH_LEVEL(

            _local_state->scanner_profile(), "AdaptiveBatchPredictedRows", TUnit::UNIT, 1);

    _adaptive_batch_actual_bytes_counter = ADD_COUNTER_WITH_LEVEL(

            _local_state->scanner_profile(), "AdaptiveBatchActualBytes", TUnit::BYTES, 1);

    _adaptive_batch_probe_count_counter = ADD_COUNTER_WITH_LEVEL(

            _local_state->scanner_profile(), "AdaptiveBatchProbeCount", TUnit::UNIT, 1);

    _file_cache_statistics = std::make_unique<io::FileCacheStatistics>();

    _file_reader_stats = std::make_unique<io::FileReaderStats>();

    RETURN_IF_ERROR(_init_io_ctx());

    _io_ctx->file_cache_stats = _file_cache_statistics.get();

    _io_ctx->file_reader_stats = _file_reader_stats.get();

    _io_ctx->is_disposable = _state->query_options().disable_file_cache;

    return Status::OK();

}

Status FileScannerV2::_open_impl(RuntimeState* state) {

    RETURN_IF_CANCELLED(state);

    RETURN_IF_ERROR(Scanner::_open_impl(state));

    RETURN_IF_ERROR(_split_source->get_next(&_first_scan_range, &_current_range));

    if (_first_scan_range) {

        RETURN_IF_ERROR(_create_table_reader_for_format(_current_range, &_table_reader));

        DORIS_CHECK(_table_reader != nullptr);

        RETURN_IF_ERROR(_init_expr_ctxes());

        RETURN_IF_ERROR(_init_table_reader(_current_range));

    }

    return Status::OK();

}

Status FileScannerV2::_get_block_impl(RuntimeState* state, Block* block, bool* eof) {

    while (true) {

        RETURN_IF_CANCELLED(state);

        if (!_has_prepared_split) {

            RETURN_IF_ERROR(_prepare_next_split(eof));

            if (*eof) {

                return Status::OK();

            }

        }

        {

            SCOPED_TIMER(_get_block_timer);

            if (_should_run_adaptive_batch_size()) {

                _table_reader->set_batch_size(_predict_reader_batch_rows());

            }

            RETURN_IF_ERROR(_table_reader->get_block(block, eof));

        }

        if (*eof) {

            _state->update_num_finished_scan_range(1);

            _has_prepared_split = false;

            *eof = false;

            continue;

        }

        _update_adaptive_batch_size(*block);

        return Status::OK();

    }

}

Status FileScannerV2::_prepare_next_split(bool* eos) {

    bool has_next = _first_scan_range;

    if (!_first_scan_range) {

        RETURN_IF_ERROR(_split_source->get_next(&has_next, &_current_range));

    }

    _first_scan_range = false;

    if (!has_next || _should_stop) {

        *eos = true;

        return Status::OK();

    }

    DORIS_CHECK(_table_reader != nullptr);

    _current_range_path = _current_range.path;

    _init_adaptive_batch_size_state(get_range_format_type(*_params, _current_range));

    RETURN_IF_ERROR(_prepare_table_reader_split(_current_range));

    COUNTER_UPDATE(_file_counter, 1);

    _has_prepared_split = true;

    *eos = false;

    return Status::OK();

}

Status FileScannerV2::_init_table_reader(const TFileRangeDesc& range) {

    const auto format_type = get_range_format_type(*_params, range);

    format::FileFormat file_format;

    RETURN_IF_ERROR(_to_file_format(format_type, &file_format));

    DORIS_CHECK(_table_reader != nullptr);

    format::TableColumnPredicates table_column_predicates;

    RETURN_IF_ERROR(_build_table_column_predicates(&table_column_predicates));

    VExprContextSPtrs table_conjuncts;

    RETURN_IF_ERROR(_build_table_conjuncts(&table_conjuncts));

    RETURN_IF_ERROR(_table_reader->init({

            .projected_columns = _projected_columns,

            .column_predicates = std::move(table_column_predicates),

            .conjuncts = std::move(table_conjuncts),

            .format = file_format,

            .scan_params = const_cast<TFileScanRangeParams*>(_params),

            .io_ctx = _io_ctx,

            .runtime_state = _state,

            .scanner_profile = _local_state->scanner_profile(),

            .file_slot_descs = &_file_slot_descs,

            .push_down_agg_type = _local_state->get_push_down_agg_type(),

            .condition_cache_digest = _local_state->get_condition_cache_digest(),

    }));

    return Status::OK();

}

Status FileScannerV2::_create_table_reader_for_format(

        const TFileRangeDesc& range, std::unique_ptr<format::TableReader>* reader) const {

    DORIS_CHECK(reader != nullptr);

    const auto table_format = table_format_name(range);

    if (table_format == "NotSet" || table_format == "tvf") {

        *reader = std::make_unique<format::TableReader>();

    } else if (table_format == "hive") {

        *reader = format::hive::HiveReader::create_unique();

    } else if (table_format == "iceberg") {

        if (get_range_format_type(*_params, range) == TFileFormatType::FORMAT_JNI) {

            *reader = std::make_unique<format::iceberg::IcebergSysTableJniReader>();

        } else {

            *reader = std::make_unique<format::iceberg::IcebergTableReader>();

        }

    } else if (table_format == "paimon") {

        *reader = std::make_unique<format::paimon::PaimonHybridReader>();

    } else if (table_format == "hudi") {

        *reader = std::make_unique<format::hudi::HudiHybridReader>();

    } else if (table_format == "jdbc") {

        *reader = std::make_unique<format::jdbc::JdbcJniReader>();

    } else if (table_format == "max_compute") {

        const auto* mc_desc =

                static_cast<const MaxComputeTableDescriptor*>(_output_tuple_desc->table_desc());

        RETURN_IF_ERROR(mc_desc->init_status());

        *reader = std::make_unique<format::max_compute::MaxComputeJniReader>(mc_desc);

    } else if (table_format == "trino_connector") {

        *reader = std::make_unique<format::trino_connector::TrinoConnectorJniReader>();

    } else if (table_format == "remote_doris") {

        *reader = std::make_unique<format::remote_doris::RemoteDorisReader>();

    } else {

        return Status::NotSupported("FileScannerV2 does not support table format {}", table_format);

    }

    return Status::OK();

}

Status FileScannerV2::_prepare_table_reader_split(const TFileRangeDesc& range) {

    std::map<std::string, Field> partition_values;

    RETURN_IF_ERROR(_generate_partition_values(range, &partition_values));

    format::FileFormat current_split_format;

    RETURN_IF_ERROR(_to_file_format(get_range_format_type(*_params, range), &current_split_format));

    RETURN_IF_ERROR(_table_reader->prepare_split({

            .partition_values = std::move(partition_values),

            .cache = _kv_cache,

            .current_range = range,

            .current_split_format = current_split_format,

            .global_rowid_context = _create_global_rowid_context(range),

    }));

    return Status::OK();

}

bool FileScannerV2::_should_enable_file_meta_cache() const {

    return ExecEnv::GetInstance()->file_meta_cache()->enabled() &&

           _split_source->num_scan_ranges() < config::max_external_file_meta_cache_num / 3;

}

std::optional<format::GlobalRowIdContext> FileScannerV2::_create_global_rowid_context(

        const TFileRangeDesc& range) const {

    if (!_need_global_rowid_column) {

        return std::nullopt;

    }

    auto& id_file_map = _state->get_id_file_map();

    DORIS_CHECK(id_file_map != nullptr);

    const auto file_id = id_file_map->get_file_mapping_id(

            std::make_shared<FileMapping>(_local_state->cast<FileScanLocalState>().parent_id(),

                                          range, _should_enable_file_meta_cache()));

    return format::GlobalRowIdContext {

            .version = IdManager::ID_VERSION,

            .backend_id = BackendOptions::get_backend_id(),

            .file_id = file_id,

    };

}

Status FileScannerV2::_generate_partition_values(

        const TFileRangeDesc& range, std::map<std::string, Field>* partition_values) const {

    DORIS_CHECK(partition_values != nullptr);

    partition_values->clear();

    if (!range.__isset.columns_from_path_keys || !range.__isset.columns_from_path) {

        return Status::OK();

    }

    DORIS_CHECK(range.columns_from_path_keys.size() == range.columns_from_path.size());

    for (size_t idx = 0; idx < range.columns_from_path_keys.size(); ++idx) {

        const auto& key = range.columns_from_path_keys[idx];

        const auto it = _partition_slot_descs.find(key);

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

            continue;

        }

        const auto& value = range.columns_from_path[idx];

        const bool is_null = range.__isset.columns_from_path_is_null &&

                             idx < range.columns_from_path_is_null.size() &&

                             range.columns_from_path_is_null[idx];

        Field field;

        DORIS_CHECK(it->second.slot_desc != nullptr);

        RETURN_IF_ERROR(_parse_partition_value(it->second.slot_desc, value, is_null, &field));

        partition_values->emplace(it->second.canonical_name, std::move(field));

    }

    return Status::OK();

}

Status FileScannerV2::_parse_partition_value(const SlotDescriptor* slot_desc,

                                             const std::string& value, bool is_null,

                                             Field* field) const {

    DORIS_CHECK(slot_desc != nullptr);

    DORIS_CHECK(field != nullptr);

    if (is_null) {

        *field = Field::create_field<TYPE_NULL>(Null());

        return Status::OK();

    }

    const auto data_type = remove_nullable(slot_desc->get_data_type_ptr());

    auto column = data_type->create_column();

    auto serde = data_type->get_serde();

    DataTypeSerDe::FormatOptions options;

    options.converted_from_string = true;

    StringRef ref(value.data(), value.size());

    RETURN_IF_ERROR(serde->from_string(ref, *column, options));

    DORIS_CHECK(column->size() == 1);

    *field = (*column)[0];

    return Status::OK();

}

Status FileScannerV2::_init_expr_ctxes() {

    _slot_id_to_desc.clear();

    _slot_id_to_global_index.clear();

    _partition_slot_descs.clear();

    _file_slot_descs.clear();

    for (const auto* slot_desc : _output_tuple_desc->slots()) {

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

    }

    DORIS_CHECK(_table_reader != nullptr);

    RETURN_IF_ERROR(_build_projected_columns(*_table_reader));

    return Status::OK();

}

Status FileScannerV2::_build_projected_columns(const format::TableReader& table_reader) {

    _projected_columns.clear();

    _projected_columns.reserve(_params->required_slots.size());

    _need_global_rowid_column = false;

    format::ProjectedColumnBuildContext build_context {

            .scan_params = _params,

            .range = &_current_range,

            .runtime_state = _state,

    };

    for (size_t slot_idx = 0; slot_idx < _params->required_slots.size(); ++slot_idx) {

        const auto& slot_info = _params->required_slots[slot_idx];

        const auto it = _slot_id_to_desc.find(slot_info.slot_id);

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

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

                                         slot_info.slot_id);

        }

        auto column = _build_table_column(it->second);

        if (column.name.starts_with(BeConsts::GLOBAL_ROWID_COL)) {

            _need_global_rowid_column = true;

        }

        RETURN_IF_ERROR(_build_default_expr(slot_info, &column.default_expr));

        build_context.schema_column.reset();

        RETURN_IF_ERROR(table_reader.annotate_projected_column(slot_info, &build_context, &column));

        // Build nested children from access paths generated by the slot's access-path

        // expressions. A projected column can therefore contain only a subset of the schema

        // column's nested children.

        RETURN_IF_ERROR(AccessPathParser::build_nested_children(

                &column, it->second,

                build_context.schema_column.has_value() ? &*build_context.schema_column : nullptr));

        if (is_partition_slot(slot_info, column.name)) {

            column.is_partition_key = true;

            _partition_slot_descs.emplace(

                    column.name,

                    PartitionSlotInfo {.slot_desc = it->second, .canonical_name = column.name});

            for (const auto& alias : column.name_mapping) {

                _partition_slot_descs.emplace(

                        alias,

                        PartitionSlotInfo {.slot_desc = it->second, .canonical_name = column.name});

            }

        } else if (is_data_file_slot(slot_info, column.name)) {

            _file_slot_descs.push_back(const_cast<SlotDescriptor*>(it->second));

        }

        const auto global_index = format::GlobalIndex(slot_idx);

        _slot_id_to_global_index.emplace(slot_info.slot_id, global_index);

        _projected_columns.push_back(std::move(column));

    }

    RETURN_IF_ERROR(table_reader.validate_projected_columns(build_context));

    return Status::OK();

}

Status FileScannerV2::_build_default_expr(const TFileScanSlotInfo& slot_info,

                                          VExprContextSPtr* ctx) const {

    DORIS_CHECK(ctx != nullptr);

    if (slot_info.__isset.default_value_expr && !slot_info.default_value_expr.nodes.empty()) {

        return VExpr::create_expr_tree(slot_info.default_value_expr, *ctx);

    }

    if (_params->__isset.default_value_of_src_slot) {

        const auto it = _params->default_value_of_src_slot.find(slot_info.slot_id);

        if (it != _params->default_value_of_src_slot.end() && !it->second.nodes.empty()) {

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

        }

    }

    return Status::OK();

}

format::ColumnDefinition FileScannerV2::_build_table_column(const SlotDescriptor* slot_desc) {

    DORIS_CHECK(slot_desc != nullptr);

    format::ColumnDefinition column;

    // TODO(gabriel): why always BY_NAME here?

    column.identifier = Field::create_field<TYPE_STRING>(slot_desc->col_name());

    column.name = slot_desc->col_name();

    column.type = slot_desc->get_data_type_ptr();

    return column;

}

Status FileScannerV2::_build_table_column_predicates(

        format::TableColumnPredicates* predicates) const {

    DORIS_CHECK(predicates != nullptr);

    predicates->clear();

    const auto& slot_predicates = _local_state->cast<FileScanLocalState>()._slot_id_to_predicates;

    for (const auto& [slot_id, slot_predicate_list] : slot_predicates) {

        const auto it = _slot_id_to_desc.find(slot_id);

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

            continue;

        }

        const auto global_index_it = _slot_id_to_global_index.find(slot_id);

        if (global_index_it == _slot_id_to_global_index.end()) {

            continue;

        }

        (*predicates)[global_index_it->second] = slot_predicate_list;

    }

    return Status::OK();

}

Status FileScannerV2::_build_table_conjuncts(VExprContextSPtrs* conjuncts) const {

    DORIS_CHECK(conjuncts != nullptr);

    conjuncts->clear();

    conjuncts->reserve(_conjuncts.size());

    for (const auto& conjunct : _conjuncts) {

        VExprSPtr root;

        RETURN_IF_ERROR(format::clone_table_expr_tree(conjunct->root(), &root));

        RETURN_IF_ERROR(rewrite_slot_refs_to_global_index(&root, _slot_id_to_global_index));

        conjuncts->push_back(VExprContext::create_shared(std::move(root)));

    }

    return Status::OK();

}

TFileFormatType::type FileScannerV2::_get_current_format_type() const {

    return get_range_format_type(*_params, _current_range);

}

Status FileScannerV2::_to_file_format(TFileFormatType::type format_type,

                                      format::FileFormat* file_format) {

    DORIS_CHECK(file_format != nullptr);

    switch (format_type) {

    case TFileFormatType::FORMAT_PARQUET:

        *file_format = format::FileFormat::PARQUET;

        return Status::OK();

    case TFileFormatType::FORMAT_JNI:

        *file_format = format::FileFormat::JNI;

        return Status::OK();

    case TFileFormatType::FORMAT_CSV_PLAIN:

    case TFileFormatType::FORMAT_CSV_GZ:

    case TFileFormatType::FORMAT_CSV_BZ2:

    case TFileFormatType::FORMAT_CSV_LZ4FRAME:

    case TFileFormatType::FORMAT_CSV_LZ4BLOCK:

    case TFileFormatType::FORMAT_CSV_LZOP:

    case TFileFormatType::FORMAT_CSV_DEFLATE:

    case TFileFormatType::FORMAT_CSV_SNAPPYBLOCK:

    case TFileFormatType::FORMAT_PROTO:

        *file_format = format::FileFormat::CSV;

        return Status::OK();

    case TFileFormatType::FORMAT_TEXT:

        *file_format = format::FileFormat::TEXT;

        return Status::OK();

    case TFileFormatType::FORMAT_JSON:

        *file_format = format::FileFormat::JSON;

        return Status::OK();

    case TFileFormatType::FORMAT_NATIVE:

        *file_format = format::FileFormat::NATIVE;

        return Status::OK();

    case TFileFormatType::FORMAT_ARROW:

        *file_format = format::FileFormat::ARROW;

        return Status::OK();

    default:

        return Status::NotSupported("FileScannerV2 does not support file format {}",

                                    to_string(format_type));

    }

}

Status FileScannerV2::_init_io_ctx() {

    _io_ctx = std::make_shared<io::IOContext>();

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

    return Status::OK();

}

void FileScannerV2::_reset_adaptive_batch_size_state() {

    _block_size_predictor.reset();

    COUNTER_SET(_adaptive_batch_predicted_rows_counter, int64_t(0));

    COUNTER_SET(_adaptive_batch_actual_bytes_counter, int64_t(0));

}

void FileScannerV2::_init_adaptive_batch_size_state(TFileFormatType::type format_type) {

    _reset_adaptive_batch_size_state();

    if (!_should_enable_adaptive_batch_size(format_type)) {

        return;

    }

    // V2 native file readers do not have reliable row-width hints before the first batch. Start

    // every split with a small probe, then learn bytes-per-row from the materialized table block

    // and keep later batches close to RuntimeState::preferred_block_size_bytes().

    _block_size_predictor = std::make_unique<AdaptiveBlockSizePredictor>(

            _state->preferred_block_size_bytes(), 0.0, ADAPTIVE_BATCH_INITIAL_PROBE_ROWS,

            _state->batch_size());

}

bool FileScannerV2::_should_enable_adaptive_batch_size(TFileFormatType::type format_type) const {

    if (!config::enable_adaptive_batch_size) {

        return false;

    }

    switch (format_type) {

    case TFileFormatType::FORMAT_PARQUET:

    case TFileFormatType::FORMAT_ORC:

    case TFileFormatType::FORMAT_CSV_PLAIN:

    case TFileFormatType::FORMAT_CSV_GZ:

    case TFileFormatType::FORMAT_CSV_BZ2:

    case TFileFormatType::FORMAT_CSV_LZ4FRAME:

    case TFileFormatType::FORMAT_CSV_LZ4BLOCK:

    case TFileFormatType::FORMAT_CSV_LZOP:

    case TFileFormatType::FORMAT_CSV_DEFLATE:

    case TFileFormatType::FORMAT_CSV_SNAPPYBLOCK:

    case TFileFormatType::FORMAT_PROTO:

    case TFileFormatType::FORMAT_TEXT:

    case TFileFormatType::FORMAT_JSON:

    case TFileFormatType::FORMAT_JNI:

        return true;

    default:

        return false;

    }

}

bool FileScannerV2::_should_run_adaptive_batch_size() const {

    // COUNT pushdown emits synthetic rows from file metadata and does not materialize file columns,

    // so there is no useful row-width sample to learn from.

    return _block_size_predictor != nullptr &&

           _local_state->get_push_down_agg_type() != TPushAggOp::type::COUNT;

}

size_t FileScannerV2::_predict_reader_batch_rows() {

    DORIS_CHECK(_block_size_predictor != nullptr);

    // Before history exists this returns the probe row count; after update(), it returns roughly

    // preferred_block_size_bytes / EWMA(bytes_per_row), capped by RuntimeState::batch_size().

    const size_t predicted_rows = _block_size_predictor->predict_next_rows();

    COUNTER_SET(_adaptive_batch_predicted_rows_counter, static_cast<int64_t>(predicted_rows));

    return predicted_rows;

}

void FileScannerV2::_update_adaptive_batch_size(const Block& block) {

    if (!_should_run_adaptive_batch_size()) {

        return;

    }

    COUNTER_SET(_adaptive_batch_actual_bytes_counter, static_cast<int64_t>(block.bytes()));

    if (block.rows() == 0) {

        return;

    }

    // The sample is taken after TableReader has finalized file-local columns to table columns.

    // This matches the memory shape seen by upstream operators and catches very wide nested

    // columns, such as map/string payloads, after the first probe batch.

    if (!_block_size_predictor->has_history()) {

        COUNTER_UPDATE(_adaptive_batch_probe_count_counter, 1);

    }

    _block_size_predictor->update(block);

}

Status FileScannerV2::close(RuntimeState* state) {

    if (!_try_close()) {

        return Status::OK();

    }

    if (_table_reader != nullptr) {

        RETURN_IF_ERROR(_table_reader->close());

        _report_condition_cache_profile();

        _table_reader.reset();

    }

    return Scanner::close(state);

}

void FileScannerV2::try_stop() {

    Scanner::try_stop();

    if (_io_ctx) {

        _io_ctx->should_stop = true;

    }

}

void FileScannerV2::update_realtime_counters() {

    if (_file_reader_stats == nullptr) {

        return;

    }

    const int64_t bytes_read = _file_reader_stats->read_bytes;

    COUNTER_SET(_file_read_bytes_counter, bytes_read);

    COUNTER_SET(_file_read_calls_counter, cast_set<int64_t>(_file_reader_stats->read_calls));

    COUNTER_SET(_file_read_time_counter, cast_set<int64_t>(_file_reader_stats->read_time_ns));

}

void FileScannerV2::_collect_profile_before_close() {

    _report_file_reader_predicate_filtered_rows();

    Scanner::_collect_profile_before_close();

    if (_file_reader_stats != nullptr) {

        COUNTER_SET(_file_read_bytes_counter, cast_set<int64_t>(_file_reader_stats->read_bytes));

        COUNTER_SET(_file_read_calls_counter, cast_set<int64_t>(_file_reader_stats->read_calls));

        COUNTER_SET(_file_read_time_counter, cast_set<int64_t>(_file_reader_stats->read_time_ns));

    }

    // Query profiles can be collected before Scanner::close() runs. Publish condition-cache

    // counters here as well, using deltas so this method and close() cannot double count.

    _report_condition_cache_profile();

}

bool FileScannerV2::_should_update_load_counters() const {

    if (_is_load) {

        return true;

    }

    // TVF based loads (e.g. http_stream, group commit relay) plan the load source as a

    // tvf query scan without src tuple desc, so _is_load is false. But rows filtered by

    // the load's WHERE clause still need to be reported as unselected rows. FILE_STREAM

    // is only reachable from such load entries, never from normal queries, so use it to

    // identify these scanners.

    return (_params != nullptr && _params->__isset.file_type &&

            _params->file_type == TFileType::FILE_STREAM) ||

           (_current_range.__isset.file_type && _current_range.file_type == TFileType::FILE_STREAM);

}

void FileScannerV2::_report_file_reader_predicate_filtered_rows() {

    const int64_t filtered_rows = _io_ctx != nullptr ? _io_ctx->predicate_filtered_rows : 0;

    const int64_t filtered_delta = filtered_rows - _reported_predicate_filtered_rows;

    if (filtered_delta > 0) {

        // File readers can evaluate localized conjuncts before a block reaches Scanner. Count

        // those rows as scanner-level unselected rows so load statistics stay identical no matter

        // whether a predicate is pushed down or evaluated by Scanner::_filter_output_block().

        _counter.num_rows_unselected += filtered_delta;

        _reported_predicate_filtered_rows = filtered_rows;

    }

}

void FileScannerV2::_report_condition_cache_profile() {

    auto* local_state = static_cast<FileScanLocalState*>(_local_state);

    const int64_t hit_count =

            _table_reader != nullptr ? _table_reader->condition_cache_hit_count() : 0;

    const int64_t hit_delta = hit_count - _reported_condition_cache_hit_count;

    if (hit_delta > 0) {

        COUNTER_UPDATE(local_state->_condition_cache_hit_counter, hit_delta);

        _reported_condition_cache_hit_count = hit_count;

    }

    const int64_t filtered_rows = _io_ctx != nullptr ? _io_ctx->condition_cache_filtered_rows : 0;

    const int64_t filtered_delta = filtered_rows - _reported_condition_cache_filtered_rows;

    if (filtered_delta > 0) {

        COUNTER_UPDATE(local_state->_condition_cache_filtered_rows_counter, filtered_delta);

        _reported_condition_cache_filtered_rows = filtered_rows;

    }

}

} // namespace doris