greenplumn CGroupProxy 源码
greenplumn CGroupProxy 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CGroupProxy.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2008 Greenplum, Inc.
//
// @filename:
// CGroupProxy.h
//
// @doc:
// Lock mechanism for access to a given group
//---------------------------------------------------------------------------
#ifndef GPOPT_CGroupProxy_H
#define GPOPT_CGroupProxy_H
#include "gpos/base.h"
#include "gpopt/search/CGroup.h"
namespace gpopt
{
using namespace gpos;
// forward declarations
class CGroupExpression;
class CDrvdProp;
class COptimizationContext;
//---------------------------------------------------------------------------
// @class:
// CGroupProxy
//
// @doc:
// Exclusive access to a given group
//
//---------------------------------------------------------------------------
class CGroupProxy
{
private:
// group we're operating on
CGroup *m_pgroup;
// skip group expressions starting from the given expression;
CGroupExpression *PgexprSkip(CGroupExpression *pgexprStart,
BOOL fSkipLogical);
public:
// ctor
explicit CGroupProxy(CGroup *pgroup);
// dtor
~CGroupProxy();
// set group id
void
SetId(ULONG id)
{
m_pgroup->SetId(id);
}
// set group state
void
SetState(CGroup::EState estNewState)
{
m_pgroup->SetState(estNewState);
}
// set hash join keys
void
SetJoinKeys(CExpressionArray *pdrgpexprOuter,
CExpressionArray *pdrgpexprInner, IMdIdArray *join_opfamilies)
{
m_pgroup->SetJoinKeys(pdrgpexprOuter, pdrgpexprInner, join_opfamilies);
}
// insert group expression
void Insert(CGroupExpression *pgexpr);
// move duplicate group expression to duplicates list
void MoveDuplicateGExpr(CGroupExpression *pgexpr);
// initialize group's properties;
void InitProperties(CDrvdProp *pdp);
// initialize group's stat;
void InitStats(IStatistics *stats);
// retrieve first group expression
CGroupExpression *PgexprFirst();
// retrieve next group expression
CGroupExpression *PgexprNext(CGroupExpression *pgexpr);
// get the first non-logical group expression following the given expression
CGroupExpression *PgexprSkipLogical(CGroupExpression *pgexpr);
// get the next logical group expression following the given expression
CGroupExpression *PgexprNextLogical(CGroupExpression *pgexpr);
// lookup best expression under optimization context
CGroupExpression *PgexprLookup(COptimizationContext *poc) const;
#ifdef GPOS_DEBUG
// is group transition to given state complete?
BOOL
FTransitioned(CGroup::EState estate) const
{
return (CGroup::estExplored == estate && m_pgroup->FExplored()) ||
(CGroup::estImplemented == estate && m_pgroup->FImplemented()) ||
(CGroup::estOptimized == estate && m_pgroup->FOptimized());
}
#endif // GPOS_DEBUG
}; // class CGroupProxy
} // namespace gpopt
#endif // !GPOPT_CGroupProxy_H
// EOF
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