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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