#pragma once

#include <AggregateFunctions/IAggregateFunction_fwd.h>

#include <Core/ColumnNumbers.h>

#include <Core/Field.h>

#include <Core/Names.h>

#include <Core/Types.h>

namespace DB

{

class WriteBuffer;

struct ExplainFormatSettings;

namespace JSONBuilder { class JSONMap; }

struct AggregateDescription

{

AggregateFunctionPtr function;

Array parameters; /// Parameters of the (parametric) aggregate function.

Names argument_names;

String column_name; /// What name to use for a column with aggregate function values

void explain(WriteBuffer & out, const std::string & prefix, size_t additonal_indent) const; /// Get description for EXPLAIN query.

void explain(JSONBuilder::JSONMap & map) const;

void explainPretty(ExplainFormatSettings & settings) const;

};

using AggregateDescriptions = std::vector<AggregateDescription>;

void serializeAggregateDescriptions(const AggregateDescriptions & aggregates, WriteBuffer & out);

void deserializeAggregateDescriptions(AggregateDescriptions & aggregates, ReadBuffer & in);

}