ClickHouse/src/Parsers/ASTSampleRatio.h

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

38 lines
901 B
C++
Raw Normal View History

#pragma once
#include <Parsers/IAST.h>
2021-05-04 22:42:14 +00:00
namespace DB
{
2017-05-27 17:27:16 +00:00
/** 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:
2017-05-27 17:27:16 +00:00
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);
2020-11-09 16:05:40 +00:00
void formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override;
};
}