greenplumn CColRefComputed 源码
greenplumn CColRefComputed 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CColRefComputed.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CColRefComputed.h
//
// @doc:
// Column reference implementation for computed columns
//---------------------------------------------------------------------------
#ifndef GPOS_CColRefComputed_H
#define GPOS_CColRefComputed_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CList.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/metadata/CName.h"
#include "naucrates/md/IMDType.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CColRefComputed
//
// @doc:
//
//---------------------------------------------------------------------------
class CColRefComputed : public CColRef
{
private:
public:
CColRefComputed(const CColRefComputed &) = delete;
// ctor
CColRefComputed(const IMDType *pmdtype, INT type_modifier, ULONG id,
const CName *pname);
// dtor
~CColRefComputed() override;
CColRef::Ecolreftype
Ecrt() const override
{
return CColRef::EcrtComputed;
}
// is column a system column?
BOOL
IsSystemCol() const override
{
// we cannot introduce system columns as computed column
return false;
}
// is column a distribution column?
BOOL
IsDistCol() const override
{
// we cannot introduce distribution columns as computed column
return false;
};
}; // class CColRefComputed
} // namespace gpopt
#endif // !GPOS_CColRefComputed_H
// EOF
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