greenplumn CDXLColDescr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLColDescr.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLColDescr.h
/
/ @doc:
/ Class for representing column descriptors.
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLColDescr_H
#define GPDXL_CDXLColDescr_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "naucrates/md/CMDIdGPDB.h"
#include "naucrates/md/CMDName.h"
namespace gpdxl
{
using namespace gpmd;
/ fwd decl
class CXMLSerializer;
class CDXLColDescr;
using CDXLColDescrArray = CDynamicPtrArray<CDXLColDescr, CleanupRelease>;
/---------------------------------------------------------------------------
/ @class:
/ CDXLColDescr
/
/ @doc:
/ Class for representing column descriptors in DXL operators
/
/---------------------------------------------------------------------------
class CDXLColDescr : public CRefCount
{
private:
/ name
CMDName *m_md_name;
/ column id: unique identifier of that instance of the column in the query
ULONG m_column_id;
/ attribute number in the database (corresponds to varattno in GPDB)
INT m_attr_no;
/ mdid of column's type
IMDId *m_column_mdid_type;
INT m_type_modifier;
/ is column dropped from the table: needed for correct restoring of attribute numbers in the range table entries
BOOL m_is_dropped;
/ width of the column, for instance char(10) column has width 10
ULONG m_column_width;
public:
CDXLColDescr(const CDXLColDescr &) = delete;
/ ctor
CDXLColDescr(CMDName *, ULONG column_id, INT attr_no,
IMDId *column_mdid_type, INT type_modifier, BOOL is_dropped,
ULONG width = gpos::ulong_max);
/dtor
~CDXLColDescr() override;
/ column name
const CMDName *MdName() const;
/ column identifier
ULONG Id() const;
/ attribute number of the column in the base table
INT AttrNum() const;
/ is the column dropped in the base table
BOOL IsDropped() const;
/ column type
IMDId *MdidType() const;
INT TypeModifier() const;
/ column width
ULONG Width() const;
void SerializeToDXL(CXMLSerializer *xml_serializer) const;
};
} / namespace gpdxl
#endif / !GPDXL_CDXLColDescr_H
/ EOF
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