github-actions[bot] commented on code in PR #25138:
URL: https://github.com/apache/doris/pull/25138#discussion_r1349701155


##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {

Review Comment:
   warning: function 'to_timestamp_micros' should be marked [[nodiscard]] 
[modernize-use-nodiscard]
   
   ```suggestion
       [[nodiscard]] inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t 
lo) const {
   ```
   



##########
be/src/vec/exec/scan/scanner_scheduler.cpp:
##########
@@ -381,9 +381,9 @@ void ScannerScheduler::_scanner_scan(ScannerScheduler* 
scheduler, ScannerContext
             break;
         }
 
-        BlockUPtr block = ctx->get_free_block();
+        BlockUPtr block = ctx->get_free_block(); //create block <- 
_output_tuple_desc / 想要的结果

Review Comment:
   warning: variable 'block' is not initialized 
[cppcoreguidelines-init-variables]
   
   ```suggestion
           BlockUPtr block = 0 = ctx->get_free_block(); //create block <- 
_output_tuple_desc / 想要的结果
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {

Review Comment:
   warning: annotate this function with 'override' or (rarely) 'final' 
[modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;

Review Comment:
   warning: 'virtual' is redundant since the function is already declared 
'override' [modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override;
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;

Review Comment:
   warning: 'virtual' is redundant since the function is already declared 
'override' [modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override;
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {

Review Comment:
   warning: annotate this function with 'override' or (rarely) 'final' 
[modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>

Review Comment:
   warning: 'gen_cpp/Metrics_types.h' file not found [clang-diagnostic-error]
   ```cpp
   #include <gen_cpp/Metrics_types.h>
            ^
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            int64 x = reinterpret_cast<const 
ColumnVector<Int64>*>(src_col)->get_data()[i];
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            //            
reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            value.from_unixtime(x / doc->_decode_params->second_mask, 
*doc->_decode_params->ctz);
+            value.set_microsecond((x % doc->_decode_params->second_mask) *
+                                  doc->_decode_params->scale_to_nano_factor / 
1000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+class int32todate : public ColumnConvert {
+public:
+    DocTime* doc;
+    int32todate(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {

Review Comment:
   warning: annotate this function with 'override' or (rarely) 'final' 
[modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            int64 x = reinterpret_cast<const 
ColumnVector<Int64>*>(src_col)->get_data()[i];
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            //            
reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            value.from_unixtime(x / doc->_decode_params->second_mask, 
*doc->_decode_params->ctz);
+            value.set_microsecond((x % doc->_decode_params->second_mask) *
+                                  doc->_decode_params->scale_to_nano_factor / 
1000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+class int32todate : public ColumnConvert {
+public:
+    DocTime* doc;
+    int32todate(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            //            auto& value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            //            reinterpret_cast<DateV2Value<DateV2ValueType>>();
+            auto& value = reinterpret_cast<DateV2Value<DateV2ValueType>&>(
+                    reinterpret_cast<ColumnDateV2*>(dst_col)->get_data()[i]);
+            //            value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            int64_t date_value =
+                    reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i] +
+                    doc->_decode_params->offset_days;
+            date_day_offset_dict& date_dict = date_day_offset_dict::get();
+            value = date_dict[date_value];
+        }
+
+        return Status::OK();
+    }
+};
+
+template <typename DecimalType, bool is_nullable>
+class stringtodecimal : public ColumnConvert {
+public:
+    DocTime* doc;
+    stringtodecimal(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        DecimalScaleParams& scale_params = doc->_decode_params->decimal_scale;
+        auto buf = static_cast<const 
ColumnString*>(src_col)->get_chars().data();
+        auto& offset = static_cast<const 
ColumnString*>(src_col)->get_offsets();
+        dst_col->resize(rows);
+        auto& data = 
static_cast<ColumnDecimal<DecimalType>*>(dst_col)->get_data();
+        for (int i = 0; i < rows; i++) {
+            int len = offset[i] - offset[i - 1];
+            Int128 value = buf[offset[i - 1]] & 0x80 ? -1 : 0;
+            memcpy(reinterpret_cast<char*>(&value) + sizeof(Int128) - len, buf 
+ offset[i - 1],
+                   len);
+            value = BigEndian::ToHost128(value);
+            if (scale_params.scale_type == DecimalScaleParams::SCALE_UP) {
+                value *= scale_params.scale_factor;
+            } else if (scale_params.scale_type == 
DecimalScaleParams::SCALE_DOWN) {
+                value /= scale_params.scale_factor;
+            }
+            auto& v = reinterpret_cast<DecimalType&>(data[i]);
+            v = (DecimalType)value;
+        }
+
+        return Status::OK();
+    }
+};
+template <typename NumberType, typename DecimalPhysicalType, bool is_nullable>
+class numbertodecimal : public ColumnConvert {
+    DocTime* doc;
+
+public:
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        auto* src_data = static_cast<const 
ColumnVector<NumberType>*>(src_col)->get_data().data();
+        dst_col->resize(rows);
+        DecimalScaleParams& scale_params = doc->_decode_params->decimal_scale;
+        auto* data = 
static_cast<ColumnDecimal<Decimal<Int64>>*>(dst_col)->get_data().data();

Review Comment:
   warning: variable 'data' is not initialized 
[cppcoreguidelines-init-variables]
   
   ```suggestion
           auto* data = nullptr = 
static_cast<ColumnDecimal<Decimal<Int64>>*>(dst_col)->get_data().data();
   ```
   



##########
be/src/vec/exec/format/parquet/parquet_common.h:
##########
@@ -54,6 +54,14 @@ struct ParquetInt96 {
     inline uint64_t to_timestamp_micros() const {
         return (hi - JULIAN_EPOCH_OFFSET_DAYS) * MICROS_IN_DAY + lo / 
NANOS_PER_MICROSECOND;
     }
+    inline __int128 to_int128() const {

Review Comment:
   warning: function 'to_int128' should be marked [[nodiscard]] 
[modernize-use-nodiscard]
   
   ```suggestion
       [[nodiscard]] inline __int128 to_int128() const {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            int64 x = reinterpret_cast<const 
ColumnVector<Int64>*>(src_col)->get_data()[i];
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            //            
reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            value.from_unixtime(x / doc->_decode_params->second_mask, 
*doc->_decode_params->ctz);
+            value.set_microsecond((x % doc->_decode_params->second_mask) *
+                                  doc->_decode_params->scale_to_nano_factor / 
1000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+class int32todate : public ColumnConvert {
+public:
+    DocTime* doc;
+    int32todate(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            //            auto& value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            //            reinterpret_cast<DateV2Value<DateV2ValueType>>();
+            auto& value = reinterpret_cast<DateV2Value<DateV2ValueType>&>(
+                    reinterpret_cast<ColumnDateV2*>(dst_col)->get_data()[i]);
+            //            value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            int64_t date_value =
+                    reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i] +
+                    doc->_decode_params->offset_days;
+            date_day_offset_dict& date_dict = date_day_offset_dict::get();
+            value = date_dict[date_value];
+        }
+
+        return Status::OK();
+    }
+};
+
+template <typename DecimalType, bool is_nullable>
+class stringtodecimal : public ColumnConvert {
+public:
+    DocTime* doc;
+    stringtodecimal(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        DecimalScaleParams& scale_params = doc->_decode_params->decimal_scale;
+        auto buf = static_cast<const 
ColumnString*>(src_col)->get_chars().data();
+        auto& offset = static_cast<const 
ColumnString*>(src_col)->get_offsets();
+        dst_col->resize(rows);
+        auto& data = 
static_cast<ColumnDecimal<DecimalType>*>(dst_col)->get_data();
+        for (int i = 0; i < rows; i++) {
+            int len = offset[i] - offset[i - 1];
+            Int128 value = buf[offset[i - 1]] & 0x80 ? -1 : 0;
+            memcpy(reinterpret_cast<char*>(&value) + sizeof(Int128) - len, buf 
+ offset[i - 1],
+                   len);
+            value = BigEndian::ToHost128(value);
+            if (scale_params.scale_type == DecimalScaleParams::SCALE_UP) {
+                value *= scale_params.scale_factor;
+            } else if (scale_params.scale_type == 
DecimalScaleParams::SCALE_DOWN) {
+                value /= scale_params.scale_factor;
+            }
+            auto& v = reinterpret_cast<DecimalType&>(data[i]);
+            v = (DecimalType)value;
+        }
+
+        return Status::OK();
+    }
+};
+template <typename NumberType, typename DecimalPhysicalType, bool is_nullable>
+class numbertodecimal : public ColumnConvert {
+    DocTime* doc;
+
+public:
+    Status convert(const IColumn* src_col, IColumn* dst_col) {

Review Comment:
   warning: annotate this function with 'override' or (rarely) 'final' 
[modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            int64 x = reinterpret_cast<const 
ColumnVector<Int64>*>(src_col)->get_data()[i];
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            //            
reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            value.from_unixtime(x / doc->_decode_params->second_mask, 
*doc->_decode_params->ctz);
+            value.set_microsecond((x % doc->_decode_params->second_mask) *
+                                  doc->_decode_params->scale_to_nano_factor / 
1000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+class int32todate : public ColumnConvert {
+public:
+    DocTime* doc;
+    int32todate(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            //            auto& value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            //            reinterpret_cast<DateV2Value<DateV2ValueType>>();
+            auto& value = reinterpret_cast<DateV2Value<DateV2ValueType>&>(
+                    reinterpret_cast<ColumnDateV2*>(dst_col)->get_data()[i]);
+            //            value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            int64_t date_value =
+                    reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i] +
+                    doc->_decode_params->offset_days;
+            date_day_offset_dict& date_dict = date_day_offset_dict::get();
+            value = date_dict[date_value];
+        }
+
+        return Status::OK();
+    }
+};
+
+template <typename DecimalType, bool is_nullable>
+class stringtodecimal : public ColumnConvert {
+public:
+    DocTime* doc;
+    stringtodecimal(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {

Review Comment:
   warning: annotate this function with 'override' or (rarely) 'final' 
[modernize-use-override]
   
   ```suggestion
       Status convert(const IColumn* src_col, IColumn* dst_col) override {
   ```
   



##########
be/src/vec/exec/format/convert.h:
##########
@@ -0,0 +1,512 @@
+// 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 <gen_cpp/Metrics_types.h>
+#include <gen_cpp/PlanNodes_types.h>
+#include <gen_cpp/Types_types.h>
+#include <gen_cpp/parquet_types.h>
+#include <glog/logging.h>
+
+#include <algorithm>
+#include <functional>
+#include <ostream>
+#include <utility>
+
+#include "common/status.h"
+#include "gen_cpp/descriptors.pb.h"
+#include "io/file_factory.h"
+#include "olap/olap_common.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_vector.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_factory.hpp"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_number.h"
+#include "vec/data_types/data_type_string.h"
+#include "vec/exec/format/parquet/parquet_common.h"
+
+namespace doris::vectorized {
+
+namespace convert {
+
+class DocTime {
+public:
+    std::unique_ptr<DecodeParams> _decode_params;
+    const FieldSchema* _field_schema;
+    void init_time(const FieldSchema* field_schema, cctz::time_zone* ctz) {
+        if (_decode_params == nullptr) {
+            _decode_params.reset(new DecodeParams());
+        }
+        if (ctz != nullptr) {
+            _decode_params->ctz = ctz;
+        }
+
+        _field_schema = field_schema;
+        const auto& schema = field_schema->parquet_schema;
+        if (schema.__isset.logicalType && 
schema.logicalType.__isset.TIMESTAMP) {
+            const auto& timestamp_info = schema.logicalType.TIMESTAMP;
+            if (!timestamp_info.isAdjustedToUTC) {
+                // should set timezone to utc+0
+                _decode_params->ctz = 
const_cast<cctz::time_zone*>(&_decode_params->utc0);
+            }
+            const auto& time_unit = timestamp_info.unit;
+            if (time_unit.__isset.MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (time_unit.__isset.MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            } else if (time_unit.__isset.NANOS) {
+                _decode_params->second_mask = 1000000000;
+                _decode_params->scale_to_nano_factor = 1;
+            }
+        } else if (schema.__isset.converted_type) {
+            const auto& converted_type = schema.converted_type;
+            if (converted_type == tparquet::ConvertedType::TIMESTAMP_MILLIS) {
+                _decode_params->second_mask = 1000;
+                _decode_params->scale_to_nano_factor = 1000000;
+            } else if (converted_type == 
tparquet::ConvertedType::TIMESTAMP_MICROS) {
+                _decode_params->second_mask = 1000000;
+                _decode_params->scale_to_nano_factor = 1000;
+            }
+        }
+
+        if (_decode_params->ctz) {
+            VecDateTimeValue t;
+            t.from_unixtime(0, *_decode_params->ctz);
+            _decode_params->offset_days = t.day() == 31 ? 0 : 1;
+        }
+    }
+    template <typename DecimalType>
+    void init_decimal_converter(DataTypePtr& data_type) {
+        if (_decode_params == nullptr || _field_schema == nullptr ||
+            _decode_params->decimal_scale.scale_type != 
DecimalScaleParams::NOT_INIT) {
+            return;
+        }
+        auto scale = _field_schema->parquet_schema.scale;
+        auto* decimal_type = reinterpret_cast<DataTypeDecimal<DecimalType>*>(
+                const_cast<IDataType*>(remove_nullable(data_type).get()));
+        auto dest_scale = decimal_type->get_scale();
+        if (dest_scale > scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_UP;
+            _decode_params->decimal_scale.scale_factor =
+                    
DecimalScaleParams::get_scale_factor<DecimalType>(dest_scale - scale);
+        } else if (dest_scale < scale) {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::SCALE_DOWN;
+            _decode_params->decimal_scale.scale_factor =
+                    DecimalScaleParams::get_scale_factor<DecimalType>(scale - 
dest_scale);
+        } else {
+            _decode_params->decimal_scale.scale_type = 
DecimalScaleParams::NO_SCALE;
+            _decode_params->decimal_scale.scale_factor = 1;
+        }
+    }
+};
+
+static Status convert_data_type_from_parquet(tparquet::Type::type parquet_type,
+                                             vectorized::DataTypePtr& 
ans_data_type,
+                                             DataTypePtr& src_type, bool* 
need_convert) {
+    std::cout << getTypeName(src_type->get_type_id()) << "\n";
+    if (is_complex_type(src_type)) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    switch (parquet_type) {
+    case tparquet::Type::type::BOOLEAN:
+        ans_data_type = std::make_shared<DataTypeUInt8>();
+        break;
+    case tparquet::Type::type::INT32:
+        ans_data_type = std::make_shared<DataTypeInt32>();
+        break;
+    case tparquet::Type::type::INT64:
+        ans_data_type = std::make_shared<DataTypeInt64>();
+        break;
+    case tparquet::Type::type::FLOAT:
+        ans_data_type = std::make_shared<DataTypeFloat32>();
+        break;
+    case tparquet::Type::type::DOUBLE:
+        ans_data_type = std::make_shared<DataTypeFloat64>();
+        break;
+    case tparquet::Type::type::BYTE_ARRAY:
+    case tparquet::Type::type::FIXED_LEN_BYTE_ARRAY:
+        ans_data_type = std::make_shared<DataTypeString>();
+        break;
+    case tparquet::Type::type::INT96:
+        ans_data_type = std::make_shared<DataTypeInt128>();
+        break;
+    default:
+        std::cout << "--->" << parquet_type << "\n";
+        break;
+    }
+    if (ans_data_type->get_type_id() == src_type->get_type_id()) {
+        *need_convert = false;
+        return Status::OK();
+    }
+    if (src_type->is_nullable()) {
+        auto& nested_src_type =
+                reinterpret_cast<const 
DataTypeNullable*>(src_type.get())->get_nested_type();
+        std::cout << getTypeName(nested_src_type->get_type_id()) << "\n";
+        auto sub = ans_data_type;
+        ans_data_type = std::make_shared<DataTypeNullable>(ans_data_type);
+
+        if (nested_src_type->get_type_id() == sub->get_type_id()) {
+            *need_convert = false;
+            return Status::OK();
+        }
+    }
+
+    *need_convert = true;
+    return Status::OK();
+}
+
+struct ColumnConvert {
+    Status virtual convert(const IColumn* src_col, IColumn* dst_col) { return 
Status::OK(); }
+    virtual ~ColumnConvert() = default;
+};
+
+template <typename src_type, typename dst_type, bool is_nullable>
+struct NumberColumnConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+void convert_null(const IColumn** src_col, IColumn** dst_col) {
+    size_t rows = (*src_col)->size();
+    if ((*src_col)->is_nullable()) {
+        auto src_nullable_column = reinterpret_cast<const 
ColumnNullable*>(*src_col);
+        auto dst_nullable_column = reinterpret_cast<ColumnNullable*>(*dst_col);
+        auto& dst_null_col = dst_nullable_column->get_null_map_column();
+
+        for (auto j = 0; j < rows; j++) {
+            dst_null_col.insert(src_nullable_column->get_null_map_column()[j]);
+        }
+
+        *src_col = &src_nullable_column->get_nested_column();
+        *dst_col = &dst_nullable_column->get_nested_column();
+    }
+}
+
+template <typename src_type, typename dst_type, bool is_nullable>
+Status NumberColumnConvert<src_type, dst_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                     IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        //        src_type src_value =  reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i];
+
+        dst_type value = static_cast<dst_type>(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+
+        reinterpret_cast<ColumnVector<dst_type>*>(dst_col)->insert(value);
+    }
+
+    return Status::OK();
+}
+template <typename src_type, bool is_nullable>
+struct NumberColumnToStringConvert : public ColumnConvert {
+    virtual Status convert(const IColumn* src_col, IColumn* dst_col) override;
+};
+
+template <typename src_type, bool is_nullable>
+Status NumberColumnToStringConvert<src_type, is_nullable>::convert(const 
IColumn* src_col,
+                                                                   IColumn* 
dst_col) {
+    size_t rows = src_col->size();
+    if constexpr (is_nullable) {
+        convert_null(&src_col, &dst_col);
+    }
+
+    for (int i = 0; i < rows; i++) {
+        std::string value = std::to_string(
+                reinterpret_cast<const 
ColumnVector<src_type>*>(src_col)->get_data()[i]);
+        reinterpret_cast<ColumnString*>(dst_col)->insert_data(value.data(), 
value.size());
+    }
+    return Status::OK();
+}
+
+template <bool is_nullable>
+struct int128totimestamp : public ColumnConvert {
+    int128totimestamp(DocTime* pTime) { doc = pTime; }
+
+    inline uint64_t to_timestamp_micros(uint32_t hi, uint64_t lo) const {
+        return (hi - ParquetInt96::JULIAN_EPOCH_OFFSET_DAYS) * 
ParquetInt96::MICROS_IN_DAY +
+               lo / ParquetInt96::NANOS_PER_MICROSECOND;
+    }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+
+        for (int i = 0; i < rows; i++) {
+            __int128 x = reinterpret_cast<const 
ColumnVector<Int128>*>(src_col)->get_data()[i];
+            uint32_t hi = x >> 64;
+            uint64_t lo = (x << 64) >> 64;
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            int64_t micros = to_timestamp_micros(hi, lo);
+            value.from_unixtime(micros / 1000000, *doc->_decode_params->ctz);
+            value.set_microsecond(micros % 1000000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+struct int64totimestamp : public ColumnConvert {
+public:
+    int64totimestamp(DocTime* pTime) { doc = pTime; }
+
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            int64 x = reinterpret_cast<const 
ColumnVector<Int64>*>(src_col)->get_data()[i];
+            dst_col = static_cast<ColumnVector<UInt64>*>(dst_col);
+            //            
reinterpret_cast<ColumnVector<UInt64>*>(dst_col)->insert(0);
+            auto& num = 
static_cast<ColumnVector<UInt64>*>(dst_col)->get_data()[i];
+            auto& value = 
reinterpret_cast<DateV2Value<DateTimeV2ValueType>&>(num);
+            value.from_unixtime(x / doc->_decode_params->second_mask, 
*doc->_decode_params->ctz);
+            value.set_microsecond((x % doc->_decode_params->second_mask) *
+                                  doc->_decode_params->scale_to_nano_factor / 
1000);
+            std::cout << "value = " << value << "\n";
+        }
+        return Status::OK();
+    }
+
+    DocTime* doc;
+};
+
+template <bool is_nullable>
+class int32todate : public ColumnConvert {
+public:
+    DocTime* doc;
+    int32todate(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        dst_col->resize(rows);
+        for (int i = 0; i < rows; i++) {
+            //            auto& value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            //            reinterpret_cast<DateV2Value<DateV2ValueType>>();
+            auto& value = reinterpret_cast<DateV2Value<DateV2ValueType>&>(
+                    reinterpret_cast<ColumnDateV2*>(dst_col)->get_data()[i]);
+            //            value = reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i];
+            int64_t date_value =
+                    reinterpret_cast<const 
ColumnVector<uint32>*>(src_col)->get_data()[i] +
+                    doc->_decode_params->offset_days;
+            date_day_offset_dict& date_dict = date_day_offset_dict::get();
+            value = date_dict[date_value];
+        }
+
+        return Status::OK();
+    }
+};
+
+template <typename DecimalType, bool is_nullable>
+class stringtodecimal : public ColumnConvert {
+public:
+    DocTime* doc;
+    stringtodecimal(DocTime* pTime) { doc = pTime; }
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        DecimalScaleParams& scale_params = doc->_decode_params->decimal_scale;
+        auto buf = static_cast<const 
ColumnString*>(src_col)->get_chars().data();
+        auto& offset = static_cast<const 
ColumnString*>(src_col)->get_offsets();
+        dst_col->resize(rows);
+        auto& data = 
static_cast<ColumnDecimal<DecimalType>*>(dst_col)->get_data();
+        for (int i = 0; i < rows; i++) {
+            int len = offset[i] - offset[i - 1];
+            Int128 value = buf[offset[i - 1]] & 0x80 ? -1 : 0;
+            memcpy(reinterpret_cast<char*>(&value) + sizeof(Int128) - len, buf 
+ offset[i - 1],
+                   len);
+            value = BigEndian::ToHost128(value);
+            if (scale_params.scale_type == DecimalScaleParams::SCALE_UP) {
+                value *= scale_params.scale_factor;
+            } else if (scale_params.scale_type == 
DecimalScaleParams::SCALE_DOWN) {
+                value /= scale_params.scale_factor;
+            }
+            auto& v = reinterpret_cast<DecimalType&>(data[i]);
+            v = (DecimalType)value;
+        }
+
+        return Status::OK();
+    }
+};
+template <typename NumberType, typename DecimalPhysicalType, bool is_nullable>
+class numbertodecimal : public ColumnConvert {
+    DocTime* doc;
+
+public:
+    Status convert(const IColumn* src_col, IColumn* dst_col) {
+        size_t rows = src_col->size();
+        if constexpr (is_nullable) {
+            convert_null(&src_col, &dst_col);
+        }
+        auto* src_data = static_cast<const 
ColumnVector<NumberType>*>(src_col)->get_data().data();
+        dst_col->resize(rows);
+        DecimalScaleParams& scale_params = doc->_decode_params->decimal_scale;
+        auto* data = 
static_cast<ColumnDecimal<Decimal<Int64>>*>(dst_col)->get_data().data();
+
+        for (int i = 0; i < rows; i++) {
+            Int128 value = src_data[i];
+            if (scale_params.scale_type == DecimalScaleParams::SCALE_UP) {
+                value *= scale_params.scale_factor;
+            } else if (scale_params.scale_type == 
DecimalScaleParams::SCALE_DOWN) {
+                value /= scale_params.scale_factor;
+            }
+            data[i] = (DecimalPhysicalType)value;
+        }
+        return Status::OK();
+    }
+
+public:

Review Comment:
   warning: redundant access specifier has the same accessibility as the 
previous access specifier [readability-redundant-access-specifiers]
   
   ```suggestion
   
   ```
   <details>
   <summary>Additional context</summary>
   
   **be/src/vec/exec/format/convert.h:365:** previously declared here
   ```cpp
   public:
   ^
   ```
   
   </details>
   



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