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refactor some code

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This commit is contained in:
flynn 2023-08-27 04:15:27 +00:00
parent 3723fe753e
commit dc65734059
1 changed files with 19 additions and 16 deletions
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35
src/Core/Field.h
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@ -15,7 +15,8 @@
#include <Core/UUID.h>
#include <base/IPv4andIPv6.h>
#include <base/DayNum.h>
#include <base/strong_typedef.h>
#include <base/EnumReflection.h>
namespace DB
{
@ -138,7 +139,7 @@ template <typename T> bool decimalEqual(T x, T y, UInt32 x_scale, UInt32 y_scale
template <typename T> bool decimalLess(T x, T y, UInt32 x_scale, UInt32 y_scale);
template <typename T> bool decimalLessOrEqual(T x, T y, UInt32 x_scale, UInt32 y_scale);
template <is_decimal T>
template <typename T>
class DecimalField
{
public:
@ -285,6 +286,11 @@ decltype(auto) castToNearestFieldType(T && x)
return U(x);
}
template <typename T>
concept not_field_or_bool_or_stringlike
= (!std::is_same_v<std::decay_t<T>, Field> && !std::is_same_v<std::decay_t<T>, bool>
&& !std::is_same_v<NearestFieldType<std::decay_t<T>>, String>);
/** 32 is enough. Round number is used for alignment and for better arithmetic inside std::vector.
* NOTE: Actually, sizeof(std::string) is 32 when using libc++, so Field is 40 bytes.
*/
@ -347,13 +353,6 @@ public:
|| which == Types::Decimal256;
}
/// Templates to avoid ambiguity.
template <typename T, typename Z = void *>
using enable_if_not_field_or_bool_or_stringlike_t = std::enable_if_t<
!std::is_same_v<std::decay_t<T>, Field> &&
!std::is_same_v<std::decay_t<T>, bool> &&
!std::is_same_v<NearestFieldType<std::decay_t<T>>, String>, Z>;
Field() : Field(Null{}) {}
/** Despite the presence of a template constructor, this constructor is still needed,
@ -370,7 +369,8 @@ public:
}
template <typename T>
Field(T && rhs, enable_if_not_field_or_bool_or_stringlike_t<T> = nullptr); /// NOLINT
requires not_field_or_bool_or_stringlike<T>
Field(T && rhs); /// NOLINT
Field(bool rhs) : Field(castToNearestFieldType(rhs)) /// NOLINT
{
@ -425,7 +425,8 @@ public:
/// 1. float <--> int needs explicit cast
/// 2. customized types needs explicit cast
template <typename T>
enable_if_not_field_or_bool_or_stringlike_t<T, Field> & /// NOLINT
requires not_field_or_bool_or_stringlike<T>
Field & /// NOLINT
operator=(T && rhs);
Field & operator= (bool rhs)
@ -448,7 +449,7 @@ public:
Types::Which getType() const { return which; }
std::string_view getTypeName() const;
constexpr std::string_view getTypeName() const { return magic_enum::enum_name(which); }
bool isNull() const { return which == Types::Null; }
template <typename T>
@ -838,7 +839,7 @@ template <> struct Field::EnumToType<Field::Types::Decimal32> { using Type = Dec
template <> struct Field::EnumToType<Field::Types::Decimal64> { using Type = DecimalField<Decimal64>; };
template <> struct Field::EnumToType<Field::Types::Decimal128> { using Type = DecimalField<Decimal128>; };
template <> struct Field::EnumToType<Field::Types::Decimal256> { using Type = DecimalField<Decimal256>; };
template <> struct Field::EnumToType<Field::Types::AggregateFunctionState> { using Type = AggregateFunctionStateData; };
template <> struct Field::EnumToType<Field::Types::AggregateFunctionState> { using Type = DecimalField<AggregateFunctionStateData>; };
template <> struct Field::EnumToType<Field::Types::CustomType> { using Type = CustomType; };
template <> struct Field::EnumToType<Field::Types::Bool> { using Type = UInt64; };
@ -896,14 +897,16 @@ auto & Field::safeGet()
template <typename T>
Field::Field(T && rhs, enable_if_not_field_or_bool_or_stringlike_t<T>)
requires not_field_or_bool_or_stringlike<T>
Field::Field(T && rhs)
{
auto && val = castToNearestFieldType(std::forward<T>(rhs));
createConcrete(std::forward<decltype(val)>(val));
}
template <typename T>
Field::enable_if_not_field_or_bool_or_stringlike_t<T, Field> & /// NOLINT
requires not_field_or_bool_or_stringlike<T>
Field & /// NOLINT
Field::operator=(T && rhs)
{
auto && val = castToNearestFieldType(std::forward<T>(rhs));
@ -1004,7 +1007,7 @@ void writeFieldText(const Field & x, WriteBuffer & buf);
String toString(const Field & x);
std::string_view fieldTypeToString(Field::Types::Which type);
String fieldTypeToString(Field::Types::Which type);
}