greenplumn CMDAggregateGPDB 源码
greenplumn CMDAggregateGPDB 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CMDAggregateGPDB.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CMDAggregateGPDB.h
//
// @doc:
// Class for representing for GPDB-specific aggregates in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_CMDAggregateGPDB_H
#define GPMD_CMDAggregateGPDB_H
#include "gpos/base.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
#include "naucrates/md/IMDAggregate.h"
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CMDAggregateGPDB
//
// @doc:
// Class for representing GPDB-specific aggregates in the metadata
// cache
//
//---------------------------------------------------------------------------
class CMDAggregateGPDB : public IMDAggregate
{
// memory pool
CMemoryPool *m_mp;
// DXL for object
const CWStringDynamic *m_dxl_str;
// aggregate id
IMDId *m_mdid;
// aggregate name
CMDName *m_mdname;
// result type
IMDId *m_mdid_type_result;
// type of intermediate results
IMDId *m_mdid_type_intermediate;
// is aggregate ordered
BOOL m_is_ordered;
// is aggregate splittable
BOOL m_is_splittable;
// is aggregate hash capable
BOOL m_hash_agg_capable;
public:
CMDAggregateGPDB(const CMDAggregateGPDB &) = delete;
// ctor
CMDAggregateGPDB(CMemoryPool *mp, IMDId *mdid, CMDName *mdname,
IMDId *result_type_mdid,
IMDId *intermediate_result_type_mdid, BOOL is_ordered_agg,
BOOL is_splittable, BOOL is_hash_agg_capable);
//dtor
~CMDAggregateGPDB() override;
// string representation of object
const CWStringDynamic *
GetStrRepr() const override
{
return m_dxl_str;
}
// aggregate id
IMDId *MDId() const override;
// aggregate name
CMDName Mdname() const override;
// result id
IMDId *GetResultTypeMdid() const override;
// intermediate result id
IMDId *GetIntermediateResultTypeMdid() const override;
// serialize object in DXL format
void Serialize(gpdxl::CXMLSerializer *xml_serializer) const override;
// is an ordered aggregate
BOOL
IsOrdered() const override
{
return m_is_ordered;
}
// is aggregate splittable
BOOL
IsSplittable() const override
{
return m_is_splittable;
}
// is aggregate hash capable
BOOL
IsHashAggCapable() const override
{
return m_hash_agg_capable;
}
#ifdef GPOS_DEBUG
// debug print of the type in the provided stream
void DebugPrint(IOstream &os) const override;
#endif
};
} // namespace gpmd
#endif // !GPMD_CMDAggregateGPDB_H
// EOF
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