//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CPhysicalScalarAgg.h
//
//	@doc:
//		Scalar Aggregate operator
//---------------------------------------------------------------------------
#ifndef GPOS_CPhysicalScalarAgg_H
#define GPOS_CPhysicalScalarAgg_H

#include "gpos/base.h"

#include "gpopt/operators/CPhysicalAgg.h"

namespace gpopt
{
// fwd declaration
class CDistributionSpec;

//---------------------------------------------------------------------------
//	@class:
//		CPhysicalScalarAgg
//
//	@doc:
//		scalar aggregate operator
//
//---------------------------------------------------------------------------
class CPhysicalScalarAgg : public CPhysicalAgg
{
private:
public:
	CPhysicalScalarAgg(const CPhysicalScalarAgg &) = delete;

	// ctor
	CPhysicalScalarAgg(
		CMemoryPool *mp, CColRefArray *colref_array,
		CColRefArray *pdrgpcrMinimal,  // minimal grouping columns based on FD's
		COperator::EGbAggType egbaggtype, BOOL fGeneratesDuplicates,
		CColRefArray *pdrgpcrArgDQA, BOOL fMultiStage, BOOL isAggFromSplitDQA,
		CLogicalGbAgg::EAggStage aggStage, BOOL should_enforce_distribution);

	// dtor
	~CPhysicalScalarAgg() override;


	// ident accessors
	EOperatorId
	Eopid() const override
	{
		return EopPhysicalScalarAgg;
	}

	// return a string for operator name
	const CHAR *
	SzId() const override
	{
		return "CPhysicalScalarAgg";
	}

	//-------------------------------------------------------------------------------------
	// Required Plan Properties
	//-------------------------------------------------------------------------------------

	// compute required sort columns of the n-th child
	COrderSpec *PosRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
							COrderSpec *posRequired, ULONG child_index,
							CDrvdPropArray *pdrgpdpCtxt,
							ULONG ulOptReq) const override;

	//-------------------------------------------------------------------------------------
	// Derived Plan Properties
	//-------------------------------------------------------------------------------------

	// derive sort order
	COrderSpec *PosDerive(CMemoryPool *mp,
						  CExpressionHandle &exprhdl) const override;

	//-------------------------------------------------------------------------------------
	// Enforced Properties
	//-------------------------------------------------------------------------------------

	// return order property enforcing type for this operator
	CEnfdProp::EPropEnforcingType EpetOrder(
		CExpressionHandle &exprhdl, const CEnfdOrder *peo) const override;

	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------
	//-------------------------------------------------------------------------------------

	// conversion function
	static CPhysicalScalarAgg *
	PopConvert(COperator *pop)
	{
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(EopPhysicalScalarAgg == pop->Eopid());

		return dynamic_cast<CPhysicalScalarAgg *>(pop);
	}

};	// class CPhysicalScalarAgg

}  // namespace gpopt


#endif	// !GPOS_CPhysicalScalarAgg_H

// EOF