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#pragma once
#include <Core/Field.h>
#include <DataTypes/IDataType.h>
namespace DB
{
/** Immutable constant value representation during analysis stage.
* Some query nodes can be represented by constant (scalar subqueries, functions with constant arguments).
*/
class ConstantValue;
using ConstantValuePtr = std::shared_ptr<ConstantValue>;
class ConstantValue
{
public:
ConstantValue(Field value_, DataTypePtr data_type_)
: value(std::move(value_))
, data_type(std::move(data_type_))
{}
const Field & getValue() const
{
return value;
}
const DataTypePtr & getType() const
{
return data_type;
}
private:
Field value;
DataTypePtr data_type;
};
inline bool operator==(const ConstantValue & lhs, const ConstantValue & rhs)
{
return lhs.getValue() == rhs.getValue() && lhs.getType()->equals(*rhs.getType());
}
inline bool operator!=(const ConstantValue & lhs, const ConstantValue & rhs)
{
return !(lhs == rhs);
}
}
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