greenplumn CPhysicalMotionGather 源码

greenplumn CPhysicalMotionGather 代码

文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalMotionGather.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CPhysicalMotionGather.h
//
//	@doc:
//		Physical Gather motion operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalMotionGather_H
#define GPOPT_CPhysicalMotionGather_H

#include "gpos/base.h"

#include "gpopt/base/CDistributionSpecSingleton.h"
#include "gpopt/base/COrderSpec.h"
#include "gpopt/operators/CPhysicalMotion.h"

namespace gpopt
{
//---------------------------------------------------------------------------
//	@class:
//		CPhysicalMotionGather
//
//	@doc:
//		Gather motion operator
//
//---------------------------------------------------------------------------
class CPhysicalMotionGather : public CPhysicalMotion
{
private:
	// type of segment on which this gather runs (master/segment)
	CDistributionSpecSingleton *m_pdssSingeton;

	// merge spec if the operator is order-preserving
	COrderSpec *m_pos;

	// columns used by order spec
	CColRefSet *m_pcrsSort;

public:
	CPhysicalMotionGather(const CPhysicalMotionGather &) = delete;

	// ctor
	CPhysicalMotionGather(CMemoryPool *mp,
						  CDistributionSpecSingleton::ESegmentType est);

	CPhysicalMotionGather(CMemoryPool *mp,
						  CDistributionSpecSingleton::ESegmentType est,
						  COrderSpec *pos);

	// dtor
	~CPhysicalMotionGather() override;

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

	const CHAR *
	SzId() const override
	{
		return "CPhysicalMotionGather";
	}

	CDistributionSpecSingleton::ESegmentType
	Est() const
	{
		return m_pdssSingeton->Est();
	}

	// output distribution accessor
	CDistributionSpec *
	Pds() const override
	{
		return m_pdssSingeton;
	}

	BOOL
	FOrderPreserving() const
	{
		return !m_pos->IsEmpty();
	}

	BOOL
	FOnMaster() const
	{
		return CDistributionSpecSingleton::EstMaster == Est();
	}

	// order spec
	COrderSpec *
	Pos() const
	{
		return m_pos;
	}

	// match function
	BOOL Matches(COperator *) const override;

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

	// compute required output columns of the n-th child
	CColRefSet *PcrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
							 CColRefSet *pcrsInput, ULONG child_index,
							 CDrvdPropArray *pdrgpdpCtxt,
							 ULONG ulOptReq) override;

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

	// check if required columns are included in output columns
	BOOL FProvidesReqdCols(CExpressionHandle &exprhdl, CColRefSet *pcrsRequired,
						   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;

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

	// print
	IOstream &OsPrint(IOstream &) const override;

	// conversion function
	static CPhysicalMotionGather *PopConvert(COperator *pop);

};	// class CPhysicalMotionGather

}  // namespace gpopt

#endif	// !GPOPT_CPhysicalMotionGather_H

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CExpression 源码

greenplumn CExpressionFactorizer 源码

greenplumn CExpressionHandle 源码

greenplumn CExpressionPreprocessor 源码

greenplumn CExpressionUtils 源码

greenplumn CHashedDistributions 源码

greenplumn CLogical 源码

greenplumn CLogicalApply 源码

greenplumn CLogicalAssert 源码

greenplumn CLogicalBitmapTableGet 源码