greenplumn CDXLDatum 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLDatum.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLDatum.h
/
/ @doc:
/ Class for representing DXL datums
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLDatum_H
#define GPDXL_CDXLDatum_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpos/string/CWStringConst.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
/ fwd decl
class CXMLSerializer;
/---------------------------------------------------------------------------
/ @class:
/ CDXLDatum
/
/ @doc:
/ Class for representing DXL datums
/
/---------------------------------------------------------------------------
class CDXLDatum : public CRefCount
{
private:
protected:
/ memory pool
CMemoryPool *m_mp;
/ mdid of the datum's type
IMDId *m_mdid_type;
const INT m_type_modifier;
/ is the datum NULL
BOOL m_is_null;
/ length
const ULONG m_length;
public:
CDXLDatum(const CDXLDatum &) = delete;
/ datum types
enum EdxldatumType
{
EdxldatumInt2,
EdxldatumInt4,
EdxldatumInt8,
EdxldatumBool,
EdxldatumGeneric,
EdxldatumStatsDoubleMappable,
EdxldatumStatsLintMappable,
EdxldatumOid,
EdxldatumSentinel
};
/ ctor
CDXLDatum(CMemoryPool *mp, IMDId *mdid_type, INT type_modifier,
BOOL is_null, ULONG length);
/ dtor
~CDXLDatum() override
{
m_mdid_type->Release();
}
/ mdid type of the datum
virtual IMDId *
MDId() const
{
return m_mdid_type;
}
INT TypeModifier() const;
/ is datum NULL
virtual BOOL IsNull() const;
/ byte array length
virtual ULONG Length() const;
/ serialize the datum as the given element
virtual void Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *datum_string);
/ serialize the datum as the given element
virtual void Serialize(CXMLSerializer *xml_serializer) = 0;
/ ident accessors
virtual EdxldatumType GetDatumType() const = 0;
};
/ array of datums
using CDXLDatumArray = CDynamicPtrArray<CDXLDatum, CleanupRelease>;
/ dynamic array of datum arrays -- array owns elements
using CDXLDatum2dArray = CDynamicPtrArray<CDXLDatumArray, CleanupRelease>;
} / namespace gpdxl
#endif / !GPDXL_CDXLDatum_H
/ EOF
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