greenplumn CDistributionSpecRouted 源码
greenplumn CDistributionSpecRouted 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDistributionSpecRouted.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDistributionSpecRouted.h
//
// @doc:
// Description of a routed distribution;
// Can be used as required or derived property;
//---------------------------------------------------------------------------
#ifndef GPOPT_CDistributionSpecRouted_H
#define GPOPT_CDistributionSpecRouted_H
#include "gpos/base.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/base/CDistributionSpec.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CDistributionSpecRouted
//
// @doc:
// Class for representing routed distribution specification.
//
//---------------------------------------------------------------------------
class CDistributionSpecRouted : public CDistributionSpec
{
private:
// segment id column
CColRef *m_pcrSegmentId;
public:
CDistributionSpecRouted(const CDistributionSpecRouted &) = delete;
// ctor
explicit CDistributionSpecRouted(CColRef *pcrSegmentId);
// dtor
~CDistributionSpecRouted() override;
// distribution type accessor
EDistributionType
Edt() const override
{
return CDistributionSpec::EdtRouted;
}
// segment id column accessor
CColRef *
Pcr() const
{
return m_pcrSegmentId;
}
// does this distribution satisfy the given one
BOOL Matches(const CDistributionSpec *pds) const override;
// does this distribution satisfy the given one
BOOL FSatisfies(const CDistributionSpec *pds) const override;
// return a copy of the distribution spec with remapped columns
CDistributionSpec *PdsCopyWithRemappedColumns(
CMemoryPool *mp, UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// append enforcers to dynamic array for the given plan properties
void AppendEnforcers(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prpp, CExpressionArray *pdrgpexpr,
CExpression *pexpr) override;
// hash function for routed distribution spec
ULONG HashValue() const override;
// extract columns used by the distribution spec
CColRefSet *PcrsUsed(CMemoryPool *mp) const override;
// return distribution partitioning type
EDistributionPartitioningType
Edpt() const override
{
return EdptPartitioned;
}
// print
IOstream &OsPrint(IOstream &os) const override;
// conversion function
static CDistributionSpecRouted *
PdsConvert(CDistributionSpec *pds)
{
GPOS_ASSERT(nullptr != pds);
GPOS_ASSERT(EdtRouted == pds->Edt());
return dynamic_cast<CDistributionSpecRouted *>(pds);
}
// conversion function - const argument
static const CDistributionSpecRouted *
PdsConvert(const CDistributionSpec *pds)
{
GPOS_ASSERT(nullptr != pds);
GPOS_ASSERT(EdtRouted == pds->Edt());
return dynamic_cast<const CDistributionSpecRouted *>(pds);
}
}; // class CDistributionSpecRouted
} // namespace gpopt
#endif // !GPOPT_CDistributionSpecRouted_H
// EOF
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