greenplumn CPhysicalFilter 源码
greenplumn CPhysicalFilter 代码
文件路径:/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalFilter.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CPhysicalFilter.h
//
// @doc:
// Filter operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CPhysicalFilter_H
#define GPOPT_CPhysicalFilter_H
#include "gpos/base.h"
#include "gpopt/operators/CPhysical.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CPhysicalFilter
//
// @doc:
// Filter operator
//
//---------------------------------------------------------------------------
class CPhysicalFilter : public CPhysical
{
private:
public:
CPhysicalFilter(const CPhysicalFilter &) = delete;
// ctor
explicit CPhysicalFilter(CMemoryPool *mp);
// dtor
~CPhysicalFilter() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopPhysicalFilter;
}
const CHAR *
SzId() const override
{
return "CPhysicalFilter";
}
// 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;
//-------------------------------------------------------------------------------------
// 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 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 false;
}
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
// conversion function
static CPhysicalFilter *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopPhysicalFilter == pop->Eopid());
return dynamic_cast<CPhysicalFilter *>(pop);
}
}; // class CPhysicalFilter
} // namespace gpopt
#endif // !GPOPT_CPhysicalFilter_H
// EOF
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