greenplumn CDXLDatumGeneric 源码
greenplumn CDXLDatumGeneric 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLDatumGeneric.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLDatumGeneric.h
//
// @doc:
// Class for representing DXL datum of type generic
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLDatumGeneric_H
#define GPDXL_CDXLDatumGeneric_H
#include "gpos/base.h"
#include "gpos/common/CDouble.h"
#include "naucrates/dxl/operators/CDXLDatum.h"
namespace gpdxl
{
using namespace gpos;
// fwd decl
class CXMLSerializer;
//---------------------------------------------------------------------------
// @class:
// CDXLDatumGeneric
//
// @doc:
// Class for representing DXL datum of type generic
//
//---------------------------------------------------------------------------
class CDXLDatumGeneric : public CDXLDatum
{
private:
protected:
// datum byte array
BYTE *m_byte_array;
public:
CDXLDatumGeneric(const CDXLDatumGeneric &) = delete;
// ctor
CDXLDatumGeneric(CMemoryPool *mp, IMDId *mdid_type, INT type_modifier,
BOOL is_null, BYTE *data, ULONG length);
// dtor
~CDXLDatumGeneric() override;
// byte array
const BYTE *GetByteArray() const;
// serialize the datum as the given element
void Serialize(CXMLSerializer *xml_serializer) override;
// datum type
EdxldatumType
GetDatumType() const override
{
return CDXLDatum::EdxldatumGeneric;
}
// conversion function
static CDXLDatumGeneric *
Cast(CDXLDatum *dxl_datum)
{
GPOS_ASSERT(nullptr != dxl_datum);
GPOS_ASSERT(CDXLDatum::EdxldatumGeneric == dxl_datum->GetDatumType() ||
CDXLDatum::EdxldatumStatsDoubleMappable ==
dxl_datum->GetDatumType() ||
CDXLDatum::EdxldatumStatsLintMappable ==
dxl_datum->GetDatumType());
return dynamic_cast<CDXLDatumGeneric *>(dxl_datum);
}
// statistics related APIs
// can datum be mapped to LINT
virtual BOOL
IsDatumMappableToLINT() const
{
return false;
}
// return the lint mapping needed for statistics computation
virtual LINT
GetLINTMapping() const
{
GPOS_ASSERT(IsDatumMappableToLINT());
return 0;
}
// can datum be mapped to a double
virtual BOOL
IsDatumMappableToDouble() const
{
return false;
}
// return the double mapping needed for statistics computation
virtual CDouble
GetDoubleMapping() const
{
GPOS_ASSERT(IsDatumMappableToDouble());
return 0;
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLDatumGeneric_H
// EOF
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