greenplumn CDistributionSpecNonSingleton 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDistributionSpecNonSingleton.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CDistributionSpecNonSingleton.h
/
/ @doc:
/ Description of a general distribution which imposes no singleton
/ distribution requirements;
/ Can be used only as a required property;
/---------------------------------------------------------------------------
#ifndef GPOPT_CDistributionSpecNonSingleton_H
#define GPOPT_CDistributionSpecNonSingleton_H
#include "gpos/base.h"
#include "gpopt/base/CDistributionSpec.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CDistributionSpecNonSingleton
/
/ @doc:
/ Class for representing general distribution specification which
/ imposes no requirements.
/
/---------------------------------------------------------------------------
class CDistributionSpecNonSingleton : public CDistributionSpec
{
private:
/ should Replicated distribution satisfy current distribution
BOOL m_fAllowReplicated{true};
/ should allow this non-singleton spec to be enforced?
BOOL m_fAllowEnforced{true};
public:
CDistributionSpecNonSingleton(const CDistributionSpecNonSingleton &) =
delete;
/ctor
CDistributionSpecNonSingleton();
/ctor
explicit CDistributionSpecNonSingleton(BOOL fAllowReplicated,
BOOL fAllowEnforced);
/ should Replicated distribution satisfy current distribution
BOOL
FAllowReplicated() const
{
return m_fAllowReplicated;
}
/ should allow this non-singleton spec to be enforced?
BOOL
FAllowEnforced() const
{
return m_fAllowEnforced;
}
/ accessor
EDistributionType
Edt() const override
{
return CDistributionSpec::EdtNonSingleton;
}
/ does current distribution satisfy the given one
BOOL FSatisfies(const CDistributionSpec *pds) const override;
/ append enforcers to dynamic array for the given plan properties
void AppendEnforcers(CMemoryPool *mp, CExpressionHandle &exprhdl,
CReqdPropPlan *prpp, CExpressionArray *pdrgpexpr,
CExpression *pexpr) override;
/ return distribution partitioning type
EDistributionPartitioningType
Edpt() const override
{
/ a non-singleton distribution could be replicated to all segments, or partitioned across segments
return EdptUnknown;
}
/ return true if distribution spec can be derived
BOOL
FDerivable() const override
{
return false;
}
/ print
IOstream &OsPrint(IOstream &os) const override;
/ conversion function
static CDistributionSpecNonSingleton *
PdsConvert(CDistributionSpec *pds)
{
GPOS_ASSERT(nullptr != pds);
GPOS_ASSERT(EdtNonSingleton == pds->Edt());
return dynamic_cast<CDistributionSpecNonSingleton *>(pds);
}
/ conversion function
static const CDistributionSpecNonSingleton *
PdsConvert(const CDistributionSpec *pds)
{
GPOS_ASSERT(nullptr != pds);
GPOS_ASSERT(EdtNonSingleton == pds->Edt());
return dynamic_cast<const CDistributionSpecNonSingleton *>(pds);
}
}; / class CDistributionSpecNonSingleton
} / namespace gpopt
#endif / !GPOPT_CDistributionSpecNonSingleton_H
/ EOF
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