ClickHouse/src/Storages/Statistics/TDigestStatistic.h

#pragma once

#include <Storages/Statistics/Statistics.h>

namespace DB
{

/// TDigestStatistic is a kind of histogram.
class TDigestStatistic : public IStatistic
{
    QuantileTDigest<Float64> data;
public:
    explicit TDigestStatistic(const StatisticDescription & stat_) : IStatistic(stat_)
    {
    }

    Float64 estimateLess(Float64 val) const;

    void serialize(WriteBuffer & buf) override;

    void deserialize(ReadBuffer & buf) override;

    void update(const ColumnPtr & column) override;

    UInt64 count() override;
};

}