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#pragma once
#include <Common/FieldVisitors.h>
#include <Common/NaNUtils.h>
#include <base/demangle.h>
#include <type_traits>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_CONVERT_TYPE;
}
/** Converts numeric value of any type to specified type. */
template <typename T>
class FieldVisitorConvertToNumber : public StaticVisitor<T>
{
public:
T operator() (const Null &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert NULL to {}", demangle(typeid(T).name()));
}
T operator() (const String &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert String to {}", demangle(typeid(T).name()));
}
T operator() (const Array &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert Array to {}", demangle(typeid(T).name()));
}
T operator() (const Tuple &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert Tuple to {}", demangle(typeid(T).name()));
}
T operator() (const Map &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert Map to {}", demangle(typeid(T).name()));
}
T operator() (const Object &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert Object to {}", demangle(typeid(T).name()));
}
T operator() (const UInt64 & x) const { return T(x); }
T operator() (const Int64 & x) const { return T(x); }
T operator() (const UUID & x) const { return T(x.toUnderType()); }
T operator() (const IPv4 & x) const { return T(x.toUnderType()); }
T operator() (const IPv6 & x) const { return T(x.toUnderType()); }
T operator() (const Float64 & x) const
{
if constexpr (!std::is_floating_point_v<T>)
{
if (!isFinite(x))
{
/// When converting to bool it's ok (non-zero converts to true, NaN including).
if (std::is_same_v<T, bool>)
return true;
/// Conversion of infinite values to integer is undefined.
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert infinite value to integer type");
}
else if (x > Float64(std::numeric_limits<T>::max()) || x < Float64(std::numeric_limits<T>::lowest()))
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert out of range floating point value to integer type");
}
}
if constexpr (std::is_same_v<Decimal256, T>)
{
return Int256(x);
}
else
{
return T(x);
}
}
template <typename U>
T operator() (const DecimalField<U> & x) const
{
if constexpr (std::is_floating_point_v<T>)
return x.getValue().template convertTo<T>() / x.getScaleMultiplier().template convertTo<T>();
else
return (x.getValue() / x.getScaleMultiplier()). template convertTo<T>();
}
T operator() (const AggregateFunctionStateData &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert AggregateFunctionStateData to {}", demangle(typeid(T).name()));
}
T operator() (const CustomType &) const
{
throw Exception(ErrorCodes::CANNOT_CONVERT_TYPE, "Cannot convert CustomType to {}", demangle(typeid(T).name()));
}
template <typename U>
requires is_big_int_v<U>
T operator() (const U & x) const
{
if constexpr (is_decimal<T>)
return static_cast<T>(static_cast<typename T::NativeType>(x));
else
return static_cast<T>(x);
}
T operator() (const bool & x) const { return T(x); }
};
}
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