greenplumn CPhysicalExternalScan 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalExternalScan.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 VMware, Inc. or its affiliates.
/
/ @filename:
/ CPhysicalExternalScan.h
/
/ @doc:
/ External scan operator
/---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalExternalScan_H
#define GPOPT_CPhysicalExternalScan_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysicalTableScan.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CPhysicalExternalScan
/
/ @doc:
/ External scan operator
/
/---------------------------------------------------------------------------
class CPhysicalExternalScan : public CPhysicalTableScan
{
private:
public:
CPhysicalExternalScan(const CPhysicalExternalScan &) = delete;
/ ctor
CPhysicalExternalScan(CMemoryPool *, const CName *, CTableDescriptor *,
CColRefArray *);
/ ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalExternalScan;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CPhysicalExternalScan";
}
/ match function
BOOL Matches(COperator *) const override;
/-------------------------------------------------------------------------------------
/ Derived Plan Properties
/-------------------------------------------------------------------------------------
/ derive rewindability
CRewindabilitySpec *
PrsDerive(CMemoryPool *mp,
CExpressionHandle & / exprhdl
) const override
{
/ external tables are neither rewindable nor rescannable
return GPOS_NEW(mp) CRewindabilitySpec(
CRewindabilitySpec::ErtNone, CRewindabilitySpec::EmhtNoMotion);
}
/-------------------------------------------------------------------------------------
/ Enforced Properties
/-------------------------------------------------------------------------------------
/ return rewindability property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetRewindability(
CExpressionHandle &exprhdl,
const CEnfdRewindability *per) const override;
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/-------------------------------------------------------------------------------------
/ conversion function
static CPhysicalExternalScan *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalExternalScan == pop->Eopid());
return dynamic_cast<CPhysicalExternalScan *>(pop);
}
}; / class CPhysicalExternalScan
} / namespace gpopt
#endif / !GPOPT_CPhysicalExternalScan_H
/ EOF
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