Function toString

src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp:169–172

using RelativeSize = boost::rational<ASTSampleRatio::BigNum>;

static std::string toString(const RelativeSize & x)
{
    return ASTSampleRatio::toString(x.numerator()) + "/" + ASTSampleRatio::toString(x.denominator());
}

/// Converts sample size to an approximate number of rows (ex. `SAMPLE 1000000`) to relative value (ex. `SAMPLE 0.1`).
static RelativeSize convertAbsoluteSampleSizeToRelative(const ASTSampleRatio::Rational & ratio, size_t approx_total_rows)