//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CDXLScalar.h
//
//	@doc:
//		Base class for representing scalar DXL operators.
//---------------------------------------------------------------------------

#ifndef GPDXL_CDXLScalar_H
#define GPDXL_CDXLScalar_H

#include "gpos/base.h"

#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/dxl/operators/CDXLOperator.h"

// fwd declarations
namespace gpopt
{
class CMDAccessor;
}

namespace gpdxl
{
using namespace gpopt;

//---------------------------------------------------------------------------
//	@class:
//		CDXLScalar
//
//	@doc:
//		Base class for representing scalar DXL operators
//
//---------------------------------------------------------------------------
class CDXLScalar : public CDXLOperator
{
private:
public:
	CDXLScalar(CDXLScalar &) = delete;

	// ctor/dtor
	explicit CDXLScalar(CMemoryPool *mp);

	~CDXLScalar() override = default;

	Edxloptype GetDXLOperatorType() const override;

	// does the operator return a boolean result
	virtual BOOL HasBoolResult(CMDAccessor *md_accessor) const = 0;

#ifdef GPOS_DEBUG
	void AssertValid(const CDXLNode *dxlnode,
					 BOOL validate_children) const override = 0;
#endif	// GPOS_DEBUG
};
}  // namespace gpdxl

#endif	// !GPDXL_CDXLScalar_H

// EOF