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https://github.com/ClickHouse/ClickHouse.git
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238 lines
6.5 KiB
C++
238 lines
6.5 KiB
C++
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#include <DB/IO/WriteBufferFromString.h>
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#include <DB/DataTypes/DataTypeEnum.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int SYNTAX_ERROR;
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extern const int EMPTY_DATA_PASSED;
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}
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template <typename FieldType> struct EnumName;
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template <> struct EnumName<Int8> { static constexpr auto value = "Enum8"; };
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template <> struct EnumName<Int16> { static constexpr auto value = "Enum16"; };
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template <typename Type>
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std::string DataTypeEnum<Type>::generateName(const Values & values)
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{
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std::string name;
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{
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WriteBufferFromString out{name};
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writeString(EnumName<FieldType>::value, out);
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writeChar('(', out);
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auto first = true;
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for (const auto & name_and_value : values)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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writeQuotedString(name_and_value.first, out);
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writeString(" = ", out);
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writeText(name_and_value.second, out);
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}
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writeChar(')', out);
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}
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return name;
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}
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template <typename Type>
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void DataTypeEnum<Type>::fillMaps()
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{
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for (const auto & name_and_value : values )
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{
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const auto name_to_value_pair = name_to_value_map.insert(
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{ StringRef{name_and_value.first}, name_and_value.second });
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if (!name_to_value_pair.second)
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throw Exception{
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"Duplicate names in enum: '" + name_and_value.first + "' = " + toString(name_and_value.second)
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+ " and '" + name_to_value_pair.first->first.toString() + "' = " + toString(
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name_to_value_pair.first->second),
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ErrorCodes::SYNTAX_ERROR
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};
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const auto value_to_name_pair = value_to_name_map.insert(
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{ name_and_value.second, StringRef{name_and_value.first} });
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if (!value_to_name_pair.second)
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throw Exception{
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"Duplicate values in enum: '" + name_and_value.first + "' = " + toString(name_and_value.second)
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+ " and '" + value_to_name_pair.first->second.toString() + "' = " + toString(
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value_to_name_pair.first->first),
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ErrorCodes::SYNTAX_ERROR
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};
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}
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}
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template <typename Type>
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DataTypeEnum<Type>::DataTypeEnum(const Values & values_) : values{values_}
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{
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if (values.empty())
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throw Exception{
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"DataTypeEnum enumeration cannot be empty",
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ErrorCodes::EMPTY_DATA_PASSED
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};
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fillMaps();
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std::sort(std::begin(values), std::end(values), [] (auto & left, auto & right) {
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return left.second < right.second;
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});
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name = generateName(values);
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}
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template <typename Type>
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DataTypeEnum<Type>::DataTypeEnum(const DataTypeEnum & other) : values{other.values}, name{other.name}
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{
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fillMaps();
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}
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template <typename Type>
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DataTypePtr DataTypeEnum<Type>::clone() const
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{
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return new DataTypeEnum(*this);
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeBinary(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeBinary(x, ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeBinary(Field & field, ReadBuffer & istr) const
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{
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FieldType x;
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readBinary(x, istr);
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field = nearestFieldType(x);
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeText(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeString(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeText(Field & field, ReadBuffer & istr) const
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{
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std::string name;
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readString(name, istr);
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field = nearestFieldType(getValue(StringRef(name)));
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeTextEscaped(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeEscapedString(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeTextEscaped(Field & field, ReadBuffer & istr) const
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{
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std::string name;
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readEscapedString(name, istr);
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field = nearestFieldType(getValue(StringRef(name)));
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeTextQuoted(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeQuotedString(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeTextQuoted(Field & field, ReadBuffer & istr) const
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{
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std::string name;
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readQuotedString(name, istr);
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field = nearestFieldType(getValue(StringRef(name)));
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeJSONString(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeTextXML(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeXMLString(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeTextCSV(const Field & field, WriteBuffer & ostr) const
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{
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const FieldType x = get<typename NearestFieldType<FieldType>::Type>(field);
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writeCSVString<>(getNameForValue(x), ostr);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeTextCSV(Field & field, ReadBuffer & istr, const char delimiter) const
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{
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std::string name;
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readCSVString(name, istr, delimiter);
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field = nearestFieldType(getValue(StringRef(name)));
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}
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template <typename Type>
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void DataTypeEnum<Type>::serializeBinary(
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const IColumn & column, WriteBuffer & ostr, const size_t offset, size_t limit) const
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{
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const auto & x = typeid_cast<const ColumnType &>(column).getData();
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const auto size = x.size();
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if (limit == 0 || offset + limit > size)
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limit = size - offset;
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ostr.write(reinterpret_cast<const char *>(&x[offset]), sizeof(FieldType) * limit);
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}
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template <typename Type>
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void DataTypeEnum<Type>::deserializeBinary(
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IColumn & column, ReadBuffer & istr, const size_t limit, const double avg_value_size_hint) const
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{
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auto & x = typeid_cast<ColumnType &>(column).getData();
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const auto initial_size = x.size();
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x.resize(initial_size + limit);
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const auto size = istr.readBig(reinterpret_cast<char*>(&x[initial_size]), sizeof(FieldType) * limit);
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x.resize(initial_size + size / sizeof(FieldType));
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}
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template <typename Type>
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ColumnPtr DataTypeEnum<Type>::createConstColumn(const size_t size, const Field & field) const
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{
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return new ConstColumnType(size, get<typename NearestFieldType<FieldType>::Type>(field));
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}
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template <typename Type>
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Field DataTypeEnum<Type>::getDefault() const
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{
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return typename NearestFieldType<FieldType>::Type(values.front().second);
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}
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/// Явные инстанцирования.
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template class DataTypeEnum<Int8>;
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template class DataTypeEnum<Int16>;
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}
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