greenplumn CDXLDatumStatsDoubleMappable 源码
greenplumn CDXLDatumStatsDoubleMappable 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLDatumStatsDoubleMappable.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLDatumStatsDoubleMappable.h
//
// @doc:
// Class for representing DXL datum of types having double mapping
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLDatumStatsDoubleMappable_H
#define GPDXL_CDXLDatumStatsDoubleMappable_H
#include "gpos/base.h"
#include "gpos/common/CDouble.h"
#include "naucrates/dxl/operators/CDXLDatumGeneric.h"
namespace gpdxl
{
using namespace gpos;
// fwd decl
class CXMLSerializer;
//---------------------------------------------------------------------------
// @class:
// CDXLDatumStatsDoubleMappable
//
// @doc:
// Class for representing DXL datum of types having double mapping
//
//---------------------------------------------------------------------------
class CDXLDatumStatsDoubleMappable : public CDXLDatumGeneric
{
private:
// for statistics computation, map to double
CDouble m_val;
public:
CDXLDatumStatsDoubleMappable(const CDXLDatumStatsDoubleMappable &) = delete;
// ctor
CDXLDatumStatsDoubleMappable(CMemoryPool *mp, IMDId *mdid_type,
INT type_modifier, BOOL is_null, BYTE *data,
ULONG length, CDouble val);
// dtor
~CDXLDatumStatsDoubleMappable() override = default;
// serialize the datum as the given element
void Serialize(CXMLSerializer *xml_serializer) override;
// datum type
EdxldatumType
GetDatumType() const override
{
return CDXLDatum::EdxldatumStatsDoubleMappable;
}
// statistics related APIs
// can datum be mapped to double
BOOL
IsDatumMappableToDouble() const override
{
return true;
}
// return the double mapping needed for statistics computation
CDouble
GetDoubleMapping() const override
{
return m_val;
}
// conversion function
static CDXLDatumStatsDoubleMappable *
Cast(CDXLDatum *dxl_datum)
{
GPOS_ASSERT(nullptr != dxl_datum);
GPOS_ASSERT(CDXLDatum::EdxldatumStatsDoubleMappable ==
dxl_datum->GetDatumType());
return dynamic_cast<CDXLDatumStatsDoubleMappable *>(dxl_datum);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLDatumStatsDoubleMappable_H
// EOF
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