greenplumn CDXLColRef 源码
greenplumn CDXLColRef 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLColRef.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLColRef.h
//
// @doc:
// Class for representing column references.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLColRef_H
#define GPDXL_CDXLColRef_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CRefCount.h"
#include "naucrates/md/CMDName.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
using namespace gpos;
// fwd decl
class CXMLSerializer;
class CDXLColRef;
// arrays of column references
using CDXLColRefArray = CDynamicPtrArray<CDXLColRef, CleanupRelease>;
//---------------------------------------------------------------------------
// @class:
// CDXLColRef
//
// @doc:
// Class for representing references to columns in DXL trees
//
//---------------------------------------------------------------------------
class CDXLColRef : public CRefCount
{
private:
// name
CMDName *m_mdname;
// id
const ULONG m_id;
// column type
IMDId *m_mdid_type;
// column type modifier
INT m_iTypeModifer;
public:
CDXLColRef(const CDXLColRef &) = delete;
// ctor/dtor
CDXLColRef(CMDName *mdname, ULONG id, IMDId *mdid_type, INT type_modifier);
~CDXLColRef() override;
// accessors
const CMDName *MdName() const;
IMDId *MdidType() const;
INT TypeModifier() const;
ULONG Id() const;
};
} // namespace gpdxl
#endif // !GPDXL_CDXLColRef_H
// EOF
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