#pragma once #include #include #include class DateLUTImpl; namespace DB { /** DateTime64 is same as DateTime, but it stores values as Int64 and has configurable sub-second part. * * `scale` determines number of decimal places for sub-second part of the DateTime64. */ class DataTypeDateTime64 final : public DataTypeDecimalBase, public TimezoneMixin { public: using Base = DataTypeDecimalBase; static constexpr UInt8 default_scale = 3; static constexpr auto family_name = "DateTime64"; static constexpr auto type_id = TypeIndex::DateTime64; explicit DataTypeDateTime64(UInt32 scale_, const std::string & time_zone_name = ""); // reuse timezone from other DateTime/DateTime64 DataTypeDateTime64(UInt32 scale_, const TimezoneMixin & time_zone_info); const char * getFamilyName() const override { return family_name; } std::string doGetName() const override; TypeIndex getTypeId() const override { return type_id; } bool equals(const IDataType & rhs) const override; bool canBePromoted() const override { return false; } bool canBeUsedAsVersion() const override { return true; } protected: SerializationPtr doGetDefaultSerialization() const override; }; }