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274 lines
11 KiB
C++
274 lines
11 KiB
C++
#pragma once
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#include <Core/UUID.h>
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#include <Common/UInt128.h>
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#include <common/DayNum.h>
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#include "config_formats.h"
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#include <memory>
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#if USE_PROTOBUF
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#include "ProtobufColumnMatcher.h"
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#include <IO/WriteBufferFromString.h>
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#include <boost/noncopyable.hpp>
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#include <Common/PODArray.h>
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namespace google
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{
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namespace protobuf
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{
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class Descriptor;
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class FieldDescriptor;
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}
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}
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namespace DB
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{
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class IAggregateFunction;
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using AggregateFunctionPtr = std::shared_ptr<IAggregateFunction>;
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using ConstAggregateDataPtr = const char *;
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/** Serializes a protobuf, tries to cast types if necessarily.
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*/
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class ProtobufWriter : private boost::noncopyable
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{
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public:
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ProtobufWriter(WriteBuffer & out, const google::protobuf::Descriptor * message_type, const std::vector<String> & column_names);
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~ProtobufWriter();
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/// Should be called at the beginning of writing a message.
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void startMessage();
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/// Should be called at the end of writing a message.
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void endMessage();
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/// Prepares for writing values of a field.
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/// Returns true and sets 'column_index' to the corresponding column's index.
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/// Returns false if there are no more fields to write in the message type (call endMessage() in this case).
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bool writeField(size_t & column_index);
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/// Writes a value. This function should be called one or multiple times after writeField().
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/// Returns false if there are no more place for the values in the protobuf's field.
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/// This can happen if the protobuf's field is not declared as repeated in the protobuf schema.
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bool writeNumber(Int8 value) { return writeValueIfPossible(&IConverter::writeInt8, value); }
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bool writeNumber(UInt8 value) { return writeValueIfPossible(&IConverter::writeUInt8, value); }
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bool writeNumber(Int16 value) { return writeValueIfPossible(&IConverter::writeInt16, value); }
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bool writeNumber(UInt16 value) { return writeValueIfPossible(&IConverter::writeUInt16, value); }
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bool writeNumber(Int32 value) { return writeValueIfPossible(&IConverter::writeInt32, value); }
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bool writeNumber(UInt32 value) { return writeValueIfPossible(&IConverter::writeUInt32, value); }
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bool writeNumber(Int64 value) { return writeValueIfPossible(&IConverter::writeInt64, value); }
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bool writeNumber(UInt64 value) { return writeValueIfPossible(&IConverter::writeUInt64, value); }
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bool writeNumber(UInt128 value) { return writeValueIfPossible(&IConverter::writeUInt128, value); }
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bool writeNumber(Float32 value) { return writeValueIfPossible(&IConverter::writeFloat32, value); }
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bool writeNumber(Float64 value) { return writeValueIfPossible(&IConverter::writeFloat64, value); }
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bool writeString(const StringRef & str) { return writeValueIfPossible(&IConverter::writeString, str); }
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void prepareEnumMapping(const std::vector<std::pair<std::string, Int8>> & enum_values) { current_converter->prepareEnumMapping8(enum_values); }
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void prepareEnumMapping(const std::vector<std::pair<std::string, Int16>> & enum_values) { current_converter->prepareEnumMapping16(enum_values); }
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bool writeEnum(Int8 value) { return writeValueIfPossible(&IConverter::writeEnum8, value); }
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bool writeEnum(Int16 value) { return writeValueIfPossible(&IConverter::writeEnum16, value); }
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bool writeUUID(const UUID & uuid) { return writeValueIfPossible(&IConverter::writeUUID, uuid); }
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bool writeDate(DayNum date) { return writeValueIfPossible(&IConverter::writeDate, date); }
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bool writeDateTime(time_t tm) { return writeValueIfPossible(&IConverter::writeDateTime, tm); }
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bool writeDateTime64(DateTime64 tm, UInt32 scale) { return writeValueIfPossible(&IConverter::writeDateTime64, tm, scale); }
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bool writeDecimal(Decimal32 decimal, UInt32 scale) { return writeValueIfPossible(&IConverter::writeDecimal32, decimal, scale); }
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bool writeDecimal(Decimal64 decimal, UInt32 scale) { return writeValueIfPossible(&IConverter::writeDecimal64, decimal, scale); }
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bool writeDecimal(const Decimal128 & decimal, UInt32 scale) { return writeValueIfPossible(&IConverter::writeDecimal128, decimal, scale); }
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bool writeAggregateFunction(const AggregateFunctionPtr & function, ConstAggregateDataPtr place) { return writeValueIfPossible(&IConverter::writeAggregateFunction, function, place); }
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private:
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class SimpleWriter
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{
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public:
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SimpleWriter(WriteBuffer & out_);
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~SimpleWriter();
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void startMessage();
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void endMessage();
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void startNestedMessage();
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void endNestedMessage(UInt32 field_number, bool is_group, bool skip_if_empty);
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void writeInt(UInt32 field_number, Int64 value);
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void writeUInt(UInt32 field_number, UInt64 value);
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void writeSInt(UInt32 field_number, Int64 value);
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template <typename T>
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void writeFixed(UInt32 field_number, T value);
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void writeString(UInt32 field_number, const StringRef & str);
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void startRepeatedPack();
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void addIntToRepeatedPack(Int64 value);
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void addUIntToRepeatedPack(UInt64 value);
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void addSIntToRepeatedPack(Int64 value);
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template <typename T>
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void addFixedToRepeatedPack(T value);
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void endRepeatedPack(UInt32 field_number);
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private:
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struct Piece
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{
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size_t start;
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size_t end;
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Piece(size_t start_, size_t end_) : start(start_), end(end_) {}
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Piece() = default;
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};
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struct NestedInfo
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{
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size_t num_pieces_at_start;
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size_t num_bytes_skipped_at_start;
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NestedInfo(size_t num_pieces_at_start_, size_t num_bytes_skipped_at_start_)
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: num_pieces_at_start(num_pieces_at_start_), num_bytes_skipped_at_start(num_bytes_skipped_at_start_)
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{
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}
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};
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WriteBuffer & out;
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PODArray<UInt8> buffer;
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std::vector<Piece> pieces;
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size_t current_piece_start;
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size_t num_bytes_skipped;
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std::vector<NestedInfo> nested_infos;
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};
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class IConverter
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{
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public:
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virtual ~IConverter() = default;
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virtual void writeString(const StringRef &) = 0;
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virtual void writeInt8(Int8) = 0;
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virtual void writeUInt8(UInt8) = 0;
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virtual void writeInt16(Int16) = 0;
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virtual void writeUInt16(UInt16) = 0;
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virtual void writeInt32(Int32) = 0;
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virtual void writeUInt32(UInt32) = 0;
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virtual void writeInt64(Int64) = 0;
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virtual void writeUInt64(UInt64) = 0;
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virtual void writeUInt128(const UInt128 &) = 0;
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virtual void writeFloat32(Float32) = 0;
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virtual void writeFloat64(Float64) = 0;
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virtual void prepareEnumMapping8(const std::vector<std::pair<std::string, Int8>> &) = 0;
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virtual void prepareEnumMapping16(const std::vector<std::pair<std::string, Int16>> &) = 0;
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virtual void writeEnum8(Int8) = 0;
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virtual void writeEnum16(Int16) = 0;
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virtual void writeUUID(const UUID &) = 0;
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virtual void writeDate(DayNum) = 0;
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virtual void writeDateTime(time_t) = 0;
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virtual void writeDateTime64(DateTime64, UInt32 scale) = 0;
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virtual void writeDecimal32(Decimal32, UInt32) = 0;
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virtual void writeDecimal64(Decimal64, UInt32) = 0;
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virtual void writeDecimal128(const Decimal128 &, UInt32) = 0;
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virtual void writeAggregateFunction(const AggregateFunctionPtr &, ConstAggregateDataPtr) = 0;
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};
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class ConverterBaseImpl;
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template <bool skip_null_value>
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class ConverterToString;
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template <int field_type_id, typename ToType, bool skip_null_value, bool pack_repeated>
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class ConverterToNumber;
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template <bool skip_null_value, bool pack_repeated>
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class ConverterToBool;
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template <bool skip_null_value, bool pack_repeated>
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class ConverterToEnum;
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struct ColumnMatcherTraits
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{
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struct FieldData
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{
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std::unique_ptr<IConverter> converter;
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bool is_required;
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bool is_repeatable;
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bool should_pack_repeated;
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ProtobufColumnMatcher::Message<ColumnMatcherTraits> * repeatable_container_message;
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};
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struct MessageData
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{
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UInt32 parent_field_number;
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bool is_group;
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bool is_required;
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ProtobufColumnMatcher::Message<ColumnMatcherTraits> * repeatable_container_message;
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bool need_repeat;
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};
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};
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using Message = ProtobufColumnMatcher::Message<ColumnMatcherTraits>;
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using Field = ProtobufColumnMatcher::Field<ColumnMatcherTraits>;
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void setTraitsDataAfterMatchingColumns(Message * message);
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template <int field_type_id>
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std::unique_ptr<IConverter> createConverter(const google::protobuf::FieldDescriptor * field);
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template <typename... Params>
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using WriteValueFunctionPtr = void (IConverter::*)(Params...);
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template <typename... Params, typename... Args>
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bool writeValueIfPossible(WriteValueFunctionPtr<Params...> func, Args &&... args)
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{
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if (num_values && !current_field->data.is_repeatable)
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{
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setNestedMessageNeedsRepeat();
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return false;
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}
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(current_converter->*func)(std::forward<Args>(args)...);
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++num_values;
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return true;
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}
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void setNestedMessageNeedsRepeat();
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void endWritingField();
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SimpleWriter simple_writer;
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std::unique_ptr<Message> root_message;
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Message * current_message;
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size_t current_field_index = 0;
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const Field * current_field = nullptr;
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IConverter * current_converter = nullptr;
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size_t num_values = 0;
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};
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}
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#else
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namespace DB
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{
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class IAggregateFunction;
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using AggregateFunctionPtr = std::shared_ptr<IAggregateFunction>;
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using ConstAggregateDataPtr = const char *;
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class ProtobufWriter
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{
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public:
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bool writeNumber(Int8 /* value */) { return false; }
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bool writeNumber(UInt8 /* value */) { return false; }
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bool writeNumber(Int16 /* value */) { return false; }
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bool writeNumber(UInt16 /* value */) { return false; }
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bool writeNumber(Int32 /* value */) { return false; }
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bool writeNumber(UInt32 /* value */) { return false; }
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bool writeNumber(Int64 /* value */) { return false; }
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bool writeNumber(UInt64 /* value */) { return false; }
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bool writeNumber(UInt128 /* value */) { return false; }
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bool writeNumber(Float32 /* value */) { return false; }
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bool writeNumber(Float64 /* value */) { return false; }
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bool writeString(const StringRef & /* value */) { return false; }
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void prepareEnumMapping(const std::vector<std::pair<std::string, Int8>> & /* name_value_pairs */) {}
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void prepareEnumMapping(const std::vector<std::pair<std::string, Int16>> & /* name_value_pairs */) {}
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bool writeEnum(Int8 /* value */) { return false; }
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bool writeEnum(Int16 /* value */) { return false; }
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bool writeUUID(const UUID & /* value */) { return false; }
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bool writeDate(DayNum /* date */) { return false; }
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bool writeDateTime(time_t /* tm */) { return false; }
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bool writeDateTime64(DateTime64 /*tm*/, UInt32 /*scale*/) { return false; }
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bool writeDecimal(Decimal32 /* decimal */, UInt32 /* scale */) { return false; }
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bool writeDecimal(Decimal64 /* decimal */, UInt32 /* scale */) { return false; }
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bool writeDecimal(const Decimal128 & /* decimal */, UInt32 /* scale */) { return false; }
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bool writeAggregateFunction(const AggregateFunctionPtr & /* function */, ConstAggregateDataPtr /* place */) { return false; }
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};
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}
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#endif
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