greenplumn CDrvdPropCtxtRelational 源码
greenplumn CDrvdPropCtxtRelational 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDrvdPropCtxtRelational.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC CORP.
//
// @filename:
// CDrvdPropCtxtRelational.h
//
// @doc:
// Container of information passed among expression nodes during
// derivation of relational properties
//
//---------------------------------------------------------------------------
#ifndef GPOPT_CDrvdPropCtxtRelational_H
#define GPOPT_CDrvdPropCtxtRelational_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdPropCtxt.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CDrvdPropCtxtRelational
//
// @doc:
// Container of information passed among expression nodes during
// derivation of relational properties
//
//---------------------------------------------------------------------------
class CDrvdPropCtxtRelational : public CDrvdPropCtxt
{
private:
protected:
// copy function
CDrvdPropCtxt *
PdpctxtCopy(CMemoryPool *mp) const override
{
return GPOS_NEW(mp) CDrvdPropCtxtRelational(mp);
}
// add props to context
void
AddProps(CDrvdProp * // pdp
) override
{
// derived relational context is currently empty
}
public:
CDrvdPropCtxtRelational(const CDrvdPropCtxtRelational &) = delete;
// ctor
CDrvdPropCtxtRelational(CMemoryPool *mp) : CDrvdPropCtxt(mp)
{
}
// dtor
~CDrvdPropCtxtRelational() override = default;
#ifdef GPOS_DEBUG
// is it a relational property context?
BOOL
FRelational() const override
{
return true;
}
#endif // GPOS_DEBUG
// conversion function
static CDrvdPropCtxtRelational *
PdpctxtrelConvert(CDrvdPropCtxt *pdpctxt)
{
GPOS_ASSERT(nullptr != pdpctxt);
return dynamic_cast<CDrvdPropCtxtRelational *>(pdpctxt);
}
}; // class CDrvdPropCtxtRelational
} // namespace gpopt
#endif // !GPOPT_CDrvdPropCtxtRelational_H
// EOF
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