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
相关信息
相关文章
greenplumn CDXLCtasStorageOptions 源码