greenplumn CDrvdPropCtxt 源码
greenplumn CDrvdPropCtxt 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDrvdPropCtxt.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CDrvdPropCtxt.h
//
// @doc:
// Base class for derived properties context;
//
//---------------------------------------------------------------------------
#ifndef GPOPT_CDrvdPropCtxt_H
#define GPOPT_CDrvdPropCtxt_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CRefCount.h"
namespace gpopt
{
using namespace gpos;
// fwd declarations
class CDrvdPropCtxt;
class CDrvdProp;
// dynamic array for properties
using CDrvdPropCtxtArray = CDynamicPtrArray<CDrvdPropCtxt, CleanupRelease>;
//---------------------------------------------------------------------------
// @class:
// CDrvdPropCtxt
//
// @doc:
// Container of information passed among expression nodes during
// property derivation
//
//---------------------------------------------------------------------------
class CDrvdPropCtxt : public CRefCount
{
private:
protected:
// memory pool
CMemoryPool *m_mp;
// copy function
virtual CDrvdPropCtxt *PdpctxtCopy(CMemoryPool *mp) const = 0;
// add props to context
virtual void AddProps(CDrvdProp *pdp) = 0;
public:
CDrvdPropCtxt(const CDrvdPropCtxt &) = delete;
// ctor
CDrvdPropCtxt(CMemoryPool *mp) : m_mp(mp)
{
}
// dtor
~CDrvdPropCtxt() override = default;
#ifdef GPOS_DEBUG
// is it a relational property context?
virtual BOOL
FRelational() const
{
return false;
}
// is it a plan property context?
virtual BOOL
FPlan() const
{
return false;
}
// is it a scalar property context?
virtual BOOL
FScalar() const
{
return false;
}
#endif // GPOS_DEBUG
// copy function
static CDrvdPropCtxt *
PdpctxtCopy(CMemoryPool *mp, CDrvdPropCtxt *pdpctxt)
{
if (nullptr == pdpctxt)
{
return nullptr;
}
return pdpctxt->PdpctxtCopy(mp);
}
// add derived props to context
static void
AddDerivedProps(CDrvdProp *pdp, CDrvdPropCtxt *pdpctxt)
{
if (nullptr != pdpctxt)
{
pdpctxt->AddProps(pdp);
}
}
}; // class CDrvdPropCtxt
} // namespace gpopt
#endif // !GPOPT_CDrvdPropCtxt_H
// EOF
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