ClickHouse/dbms/src/DataTypes/DataTypeNumberBase.h

#pragma once

#include <DataTypes/IDataType.h>
#include <DataTypes/DataTypeWithSimpleSerialization.h>


namespace DB
{

/** Implements part of the IDataType interface, common to all numbers and for Date and DateTime.
  */
template <typename T>
class DataTypeNumberBase : public DataTypeWithSimpleSerialization
{
    static_assert(IsNumber<T>);

public:
    static constexpr bool is_parametric = false;
    using FieldType = T;

    const char * getFamilyName() const override { return TypeName<T>::get(); }
    TypeIndex getTypeId() const override { return TypeId<T>::value; }

    void serializeText(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const override;
    void deserializeText(IColumn & column, ReadBuffer & istr, const FormatSettings & settings) const override;
    void serializeTextJSON(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings & settings) const override;
    void deserializeTextJSON(IColumn & column, ReadBuffer & istr, const FormatSettings &) const override;
    void deserializeTextCSV(IColumn & column, ReadBuffer & istr, const FormatSettings & settings) const override;
    Field getDefault() const override;

    /** Format is platform-dependent. */

    void serializeBinary(const Field & field, WriteBuffer & ostr) const override;
    void deserializeBinary(Field & field, ReadBuffer & istr) const override;
    void serializeBinary(const IColumn & column, size_t row_num, WriteBuffer & ostr) const override;
    void deserializeBinary(IColumn & column, ReadBuffer & istr) const override;
    void serializeBinaryBulk(const IColumn & column, WriteBuffer & ostr, size_t offset, size_t limit) const override;
    void deserializeBinaryBulk(IColumn & column, ReadBuffer & istr, size_t limit, double avg_value_size_hint) const override;

    MutableColumnPtr createColumn() const override;

    bool isParametric() const override { return false; }
    bool haveSubtypes() const override { return false; }
    bool shouldAlignRightInPrettyFormats() const override { return true; }
    bool textCanContainOnlyValidUTF8() const override { return true; }
    bool isComparable() const override { return true; }
    bool isValueRepresentedByNumber() const override { return true; }
    bool isValueRepresentedByInteger() const override;
    bool isValueRepresentedByUnsignedInteger() const override;
    bool isValueUnambiguouslyRepresentedInContiguousMemoryRegion() const override { return true; }
    bool haveMaximumSizeOfValue() const override { return true; }
    size_t getSizeOfValueInMemory() const override { return sizeof(T); }
    bool isCategorial() const override { return isValueRepresentedByInteger(); }
};

}