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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