greenplumn CPhysicalSort 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalSort.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CPhysicalSort.h
/
/ @doc:
/ Physical sort operator
/---------------------------------------------------------------------------
#ifndef GPOS_CPhysicalSort_H
#define GPOS_CPhysicalSort_H
#include "gpos/base.h"
#include "gpopt/base/COrderSpec.h"
#include "gpopt/operators/CPhysical.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalSort
/
/ @doc:
/ Sort operator
/
/---------------------------------------------------------------------------
class CPhysicalSort : public CPhysical
{
private:
/ order spec
COrderSpec *m_pos;
/ columns used by order spec
CColRefSet *m_pcrsSort;
public:
CPhysicalSort(const CPhysicalSort &) = delete;
/ ctor
CPhysicalSort(CMemoryPool *mp, COrderSpec *pos);
/ dtor
~CPhysicalSort() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalSort;
}
/ sort order accessor
virtual const COrderSpec *
Pos() const
{
return m_pos;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalSort";
}
/ match function
BOOL Matches(COperator *pop) const override;
/ sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
/-------------------------------------------------------------------------------------
/ Required Plan Properties
/-------------------------------------------------------------------------------------
/ compute required output columns of the n-th child
CColRefSet *PcrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) override;
/ compute required ctes of the n-th child
CCTEReq *PcteRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CCTEReq *pcter, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ compute required sort order of the n-th child
COrderSpec *PosRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
COrderSpec *posRequired, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ compute required distribution of the n-th child
CDistributionSpec *PdsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDistributionSpec *pdsRequired,
ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ compute required rewindability of the n-th child
CRewindabilitySpec *PrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CRewindabilitySpec *prsRequired,
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;
/ distribution matching type
CEnfdDistribution::EDistributionMatching
Edm(CReqdPropPlan *prppInput,
ULONG, / child_index
CDrvdPropArray *, /pdrgpdpCtxt
ULONG / ulOptReq
) override
{
/ Sort does not require Motions to be enforced on top,
/ we need to pass down incoming matching type
return prppInput->Ped()->Edm();
}
/-------------------------------------------------------------------------------------
/ Derived Plan Properties
/-------------------------------------------------------------------------------------
/ derive sort order
COrderSpec *PosDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive distribution
CDistributionSpec *PdsDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive rewindability
CRewindabilitySpec *PrsDerive(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;
/ return distribution property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetDistribution(
CExpressionHandle &exprhdl,
const CEnfdDistribution *ped) const override;
/ return rewindability property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetRewindability(
CExpressionHandle &exprhdl,
const CEnfdRewindability *per) const override;
/ return true if operator passes through stats obtained from children,
/ this is used when computing stats during costing
BOOL
FPassThruStats() const override
{
return true;
}
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ debug print
IOstream &OsPrint(IOstream &os) const override;
/ conversion function
static CPhysicalSort *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalSort == pop->Eopid());
return dynamic_cast<CPhysicalSort *>(pop);
}
}; / class CPhysicalSort
} / namespace gpopt
#endif / !GPOS_CPhysicalSort_H
/ EOF
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