greenplumn CPhysicalTableScan 源码
greenplumn CPhysicalTableScan 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPhysicalTableScan.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CPhysicalTableScan.cpp
//
// @doc:
// Implementation of basic table scan operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CPhysicalTableScan.h"
#include "gpos/base.h"
#include "gpopt/base/CDistributionSpec.h"
#include "gpopt/base/CDistributionSpecHashed.h"
#include "gpopt/base/CDistributionSpecRandom.h"
#include "gpopt/base/CDistributionSpecSingleton.h"
#include "gpopt/base/CUtils.h"
#include "gpopt/metadata/CName.h"
#include "gpopt/metadata/CTableDescriptor.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CPhysicalTableScan::CPhysicalTableScan
//
// @doc:
// ctor
//
//---------------------------------------------------------------------------
CPhysicalTableScan::CPhysicalTableScan(CMemoryPool *mp, const CName *pnameAlias,
CTableDescriptor *ptabdesc,
CColRefArray *pdrgpcrOutput)
: CPhysicalScan(mp, pnameAlias, ptabdesc, pdrgpcrOutput)
{
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalTableScan::HashValue
//
// @doc:
// Combine pointer for table descriptor and Eop
//
//---------------------------------------------------------------------------
ULONG
CPhysicalTableScan::HashValue() const
{
ULONG ulHash = gpos::CombineHashes(COperator::HashValue(),
m_ptabdesc->MDId()->HashValue());
ulHash =
gpos::CombineHashes(ulHash, CUtils::UlHashColArray(m_pdrgpcrOutput));
return ulHash;
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalTableScan::Matches
//
// @doc:
// match operator
//
//---------------------------------------------------------------------------
BOOL
CPhysicalTableScan::Matches(COperator *pop) const
{
if (Eopid() != pop->Eopid())
{
return false;
}
CPhysicalTableScan *popTableScan = CPhysicalTableScan::PopConvert(pop);
return m_ptabdesc->MDId()->Equals(popTableScan->Ptabdesc()->MDId()) &&
m_pdrgpcrOutput->Equals(popTableScan->PdrgpcrOutput());
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalTableScan::OsPrint
//
// @doc:
// debug print
//
//---------------------------------------------------------------------------
IOstream &
CPhysicalTableScan::OsPrint(IOstream &os) const
{
os << SzId() << " ";
// alias of table as referenced in the query
m_pnameAlias->OsPrint(os);
// actual name of table in catalog and columns
os << " (";
m_ptabdesc->Name().OsPrint(os);
os << ")";
return os;
}
// EOF
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