greenplumn CEnfdOrder 源码
greenplumn CEnfdOrder 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CEnfdOrder.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CEnfdOrder.cpp
//
// @doc:
// Implementation of enforceable order property
//---------------------------------------------------------------------------
#include "gpopt/base/CEnfdOrder.h"
#include "gpos/base.h"
#include "gpopt/base/CReqdPropPlan.h"
#include "gpopt/operators/CPhysicalSort.h"
using namespace gpopt;
// initialization of static variables
const CHAR *CEnfdOrder::m_szOrderMatching[EomSentinel] = {"satisfy"};
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::CEnfdOrder
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CEnfdOrder::CEnfdOrder(COrderSpec *pos, EOrderMatching eom)
: m_pos(pos), m_eom(eom)
{
GPOS_ASSERT(nullptr != pos);
GPOS_ASSERT(EomSentinel > eom);
}
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::~CEnfdOrder
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CEnfdOrder::~CEnfdOrder()
{
CRefCount::SafeRelease(m_pos);
}
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::FCompatible
//
// @doc:
// Check if the given order specification is compatible with the
// order specification of this object for the specified matching type
//
//---------------------------------------------------------------------------
BOOL
CEnfdOrder::FCompatible(COrderSpec *pos) const
{
GPOS_ASSERT(nullptr != pos);
switch (m_eom)
{
case EomSatisfy:
return pos->FSatisfies(m_pos);
case EomSentinel:
GPOS_ASSERT("invalid matching type");
}
return false;
}
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::HashValue
//
// @doc:
// Hash function
//
//---------------------------------------------------------------------------
ULONG
CEnfdOrder::HashValue() const
{
return gpos::CombineHashes(m_eom + 1, m_pos->HashValue());
}
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::Epet
//
// @doc:
// Get order enforcing type for the given operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CEnfdOrder::Epet(CExpressionHandle &exprhdl, CPhysical *popPhysical,
BOOL fOrderReqd) const
{
if (fOrderReqd)
{
return popPhysical->EpetOrder(exprhdl, this);
}
return EpetUnnecessary;
}
//---------------------------------------------------------------------------
// @function:
// CEnfdOrder::OsPrint
//
// @doc:
// Print function
//
//---------------------------------------------------------------------------
IOstream &
CEnfdOrder::OsPrint(IOstream &os) const
{
return os << (*m_pos) << " match: " << m_szOrderMatching[m_eom] << " ";
}
// EOF
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