greenplumn CDXLDatumStatsLintMappable 源码
greenplumn CDXLDatumStatsLintMappable 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLDatumStatsLintMappable.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLDatumStatsLintMappable.h
//
// @doc:
// Class for representing DXL datum of types having LINT mapping
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLDatumStatsLintMappable_H
#define GPDXL_CDXLDatumStatsLintMappable_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:
// CDXLDatumStatsLintMappable
//
// @doc:
// Class for representing DXL datum of types having LINT mapping
//
//---------------------------------------------------------------------------
class CDXLDatumStatsLintMappable : public CDXLDatumGeneric
{
private:
// for statistics computation, map to LINT
LINT m_val;
public:
CDXLDatumStatsLintMappable(const CDXLDatumStatsLintMappable &) = delete;
// ctor
CDXLDatumStatsLintMappable(CMemoryPool *mp, IMDId *mdid_type,
INT type_modifier, BOOL is_null,
BYTE *byte_array, ULONG length, LINT value);
// dtor
~CDXLDatumStatsLintMappable() override = default;
// serialize the datum as the given element
void Serialize(CXMLSerializer *xml_serializer) override;
// datum type
EdxldatumType
GetDatumType() const override
{
return CDXLDatum::EdxldatumStatsLintMappable;
}
// conversion function
static CDXLDatumStatsLintMappable *
Cast(CDXLDatum *dxl_datum)
{
GPOS_ASSERT(nullptr != dxl_datum);
GPOS_ASSERT(CDXLDatum::EdxldatumStatsLintMappable ==
dxl_datum->GetDatumType());
return dynamic_cast<CDXLDatumStatsLintMappable *>(dxl_datum);
}
// statistics related APIs
// can datum be mapped to LINT
BOOL
IsDatumMappableToLINT() const override
{
return true;
}
// return the LINT mapping needed for statistics computation
LINT
GetLINTMapping() const override
{
return m_val;
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLDatumStatsLintMappable_H
// EOF
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