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#pragma once
#include <Parsers/IAST.h>
namespace DB
{
/** Sampling factor in the form 0.1 or 1/10.
* It's important to save it as a rational number without converting it to IEEE-754.
*/
class ASTSampleRatio : public IAST
{
public:
using BigNum = __uint128_t; /// Must contain the result of multiplying two UInt64.
struct Rational
{
BigNum numerator = 0;
BigNum denominator = 1;
};
Rational ratio;
explicit ASTSampleRatio(const Rational & ratio_) : ratio(ratio_) {}
String getID(char delim) const override { return "SampleRatio" + (delim + toString(ratio)); }
ASTPtr clone() const override { return std::make_shared<ASTSampleRatio>(*this); }
static String toString(BigNum num);
static String toString(Rational ratio);
void formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override;
};
inline bool operator==(const ASTSampleRatio::Rational & lhs, const ASTSampleRatio::Rational & rhs)
{
return lhs.numerator == rhs.numerator && lhs.denominator == rhs.denominator;
}
inline bool operator!=(const ASTSampleRatio::Rational & lhs, const ASTSampleRatio::Rational & rhs)
{
return !(lhs == rhs);
}
}
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