greenplumn CDistributionSpecStrictSingleton 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CDistributionSpecStrictSingleton.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CDistributionSpecStrictSingleton.cpp
/
/ @doc:
/ Specification of strict singleton distribution
/---------------------------------------------------------------------------
#include "gpopt/base/CDistributionSpecStrictSingleton.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CDistributionSpecStrictSingleton::CDistributionSpecStrictSingleton
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDistributionSpecStrictSingleton::CDistributionSpecStrictSingleton(
ESegmentType est)
: CDistributionSpecSingleton(est)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CDistributionSpecStrictSingleton::FSatisfies
/
/ @doc:
/ Check if this distribution spec satisfies the given one
/
/---------------------------------------------------------------------------
BOOL
CDistributionSpecStrictSingleton::FSatisfies(
const CDistributionSpec *pdss) const
{
if (Matches(pdss))
{
/ exact match implies satisfaction
return true;
}
if (EdtNonSingleton == pdss->Edt())
{
/ singleton does not satisfy non-singleton requirements
return false;
}
if (EdtAny == pdss->Edt())
{
/ a singleton distribution satisfies "any"
return true;
}
return (
(EdtSingleton == pdss->Edt() || EdtStrictSingleton == pdss->Edt()) &&
m_est == static_cast<const CDistributionSpecSingleton *>(pdss)->Est());
}
/---------------------------------------------------------------------------
/ @function:
/ CDistributionSpecStrictSingleton::OsPrint
/
/ @doc:
/ Print function
/
/---------------------------------------------------------------------------
IOstream &
CDistributionSpecStrictSingleton::OsPrint(IOstream &os) const
{
return os << "STRICT SINGLETON (" << m_szSegmentType[m_est] << ")";
}
/ EOF
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