greenplumn CDXLDatum 源码
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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