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#pragma once
#include "ValueSourceVisitor.h"
#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
namespace GatherUtils
{
struct IValueSource
{
virtual ~IValueSource() = default;
virtual void accept(ValueSourceVisitor &)
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Accept not implemented for {}", demangle(typeid(*this).name()));
}
virtual bool isConst() const { return false; }
};
template <typename Derived>
class ValueSourceImpl : public Visitable<Derived, IValueSource, ValueSourceVisitor> {};
}
}
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