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#pragma once
#include <Core/Field.h>
#include <Core/AccurateComparison.h>
#include <base/demangle.h>
#include <Common/FieldVisitors.h>
#include <IO/ReadBufferFromString.h>
#include <IO/ReadHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_TYPE_OF_FIELD;
}
/** More precise comparison, used for index.
* Differs from Field::operator< and Field::operator== in that it also compares values of different types.
* Comparison rules are same as in FunctionsComparison (to be consistent with expression evaluation in query).
*/
class FieldVisitorAccurateEquals : public StaticVisitor<bool>
{
public:
template <typename T, typename U>
bool operator() (const T & l, const U & r) const
{
if constexpr (std::is_same_v<T, Null> || std::is_same_v<U, Null>)
{
if constexpr (std::is_same_v<T, Null> && std::is_same_v<U, Null>)
return l == r;
return false;
}
else if constexpr (std::is_same_v<T, bool>)
{
return operator()(UInt8(l), r);
}
else if constexpr (std::is_same_v<U, bool>)
{
return operator()(l, UInt8(r));
}
else
{
if constexpr (std::is_same_v<T, U>)
return l == r;
if constexpr (is_arithmetic_v<T> && is_arithmetic_v<U>)
return accurate::equalsOp(l, r);
/// TODO This is wrong (does not respect scale).
if constexpr (is_decimal_field<T> && is_decimal_field<U>)
return l == r;
if constexpr (is_decimal_field<T> && is_arithmetic_v<U>)
return l == DecimalField<Decimal256>(Decimal256(r), 0);
if constexpr (is_arithmetic_v<T> && is_decimal_field<U>)
return DecimalField<Decimal256>(Decimal256(l), 0) == r;
if constexpr (std::is_same_v<T, String> && is_arithmetic_v<U>)
{
ReadBufferFromString in(l);
U parsed;
readText(parsed, in);
return operator()(parsed, r);
}
if constexpr (std::is_same_v<U, String> && is_arithmetic_v<T>)
{
ReadBufferFromString in(r);
T parsed;
readText(parsed, in);
return operator()(l, parsed);
}
}
throw Exception(ErrorCodes::BAD_TYPE_OF_FIELD, "Cannot compare {} with {}",
demangle(typeid(T).name()), demangle(typeid(U).name()));
}
};
class FieldVisitorAccurateLess : public StaticVisitor<bool>
{
public:
template <typename T, typename U>
bool operator() (const T & l, const U & r) const
{
if constexpr (std::is_same_v<T, Null> && std::is_same_v<U, Null>)
{
return l.isNegativeInfinity() && r.isPositiveInfinity();
}
else if constexpr (std::is_same_v<T, Null>)
{
return l.isNegativeInfinity();
}
else if constexpr (std::is_same_v<U, Null>)
{
return r.isPositiveInfinity();
}
else if constexpr (std::is_same_v<T, bool>)
{
return operator()(UInt8(l), r);
}
else if constexpr (std::is_same_v<U, bool>)
{
return operator()(l, UInt8(r));
}
else
{
if constexpr (std::is_same_v<T, U>)
return l < r;
if constexpr (is_arithmetic_v<T> && is_arithmetic_v<U>)
return accurate::lessOp(l, r);
/// TODO This is wrong (does not respect scale).
if constexpr (is_decimal_field<T> && is_decimal_field<U>)
return l < r;
if constexpr (is_decimal_field<T> && is_arithmetic_v<U>)
return l < DecimalField<Decimal256>(Decimal256(r), 0);
if constexpr (is_arithmetic_v<T> && is_decimal_field<U>)
return DecimalField<Decimal256>(Decimal256(l), 0) < r;
if constexpr (std::is_same_v<T, String> && is_arithmetic_v<U>)
{
ReadBufferFromString in(l);
U parsed;
readText(parsed, in);
return operator()(parsed, r);
}
if constexpr (std::is_same_v<U, String> && is_arithmetic_v<T>)
{
ReadBufferFromString in(r);
T parsed;
readText(parsed, in);
return operator()(l, parsed);
}
}
throw Exception(ErrorCodes::BAD_TYPE_OF_FIELD, "Cannot compare {} with {}",
demangle(typeid(T).name()), demangle(typeid(U).name()));
}
};
class FieldVisitorAccurateLessOrEqual : public StaticVisitor<bool>
{
public:
template <typename T, typename U>
bool operator()(const T & l, const U & r) const
{
auto less_cmp = FieldVisitorAccurateLess();
return !less_cmp(r, l);
}
};
}
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