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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