greenplumn CDXLPhysicalAgg 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalAgg.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLPhysicalAgg.h
/
/ @doc:
/ Class for representing DXL aggregate operators.
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalAgg_H
#define GPDXL_CDXLPhysicalAgg_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
namespace gpdxl
{
/ indices of group by elements in the children array
enum Edxlagg
{
EdxlaggIndexProjList = 0,
EdxlaggIndexFilter,
EdxlaggIndexChild,
EdxlaggIndexSentinel
};
enum EdxlAggStrategy
{
EdxlaggstrategyPlain,
EdxlaggstrategySorted,
EdxlaggstrategyHashed,
EdxlaggstrategySentinel
};
/---------------------------------------------------------------------------
/ @class:
/ CDXLPhysicalAgg
/
/ @doc:
/ Class for representing DXL aggregate operators
/
/---------------------------------------------------------------------------
class CDXLPhysicalAgg : public CDXLPhysical
{
private:
/ private copy ctor
CDXLPhysicalAgg(const CDXLPhysicalAgg &);
/ grouping column ids
ULongPtrArray *m_grouping_colids_array;
EdxlAggStrategy m_dxl_agg_strategy;
/ is it safe to stream the local hash aggregate
BOOL m_stream_safe;
/ serialize output grouping columns indices in DXL
void SerializeGroupingColsToDXL(CXMLSerializer *xml_serializer) const;
public:
/ ctor
CDXLPhysicalAgg(CMemoryPool *mp, EdxlAggStrategy dxl_agg_strategy,
BOOL stream_safe);
/ dtor
~CDXLPhysicalAgg() override;
/ accessors
Edxlopid GetDXLOperator() const override;
EdxlAggStrategy GetAggStrategy() const;
const CWStringConst *GetOpNameStr() const override;
const CWStringConst *GetAggStrategyNameStr() const;
const CWStringConst *PstrAggLevel() const;
const ULongPtrArray *GetGroupingColidArray() const;
/ set grouping column indices
void SetGroupingCols(ULongPtrArray *);
/ is aggregate a hash aggregate that it safe to stream
BOOL
IsStreamSafe() const
{
return (EdxlaggstrategyHashed == m_dxl_agg_strategy) && m_stream_safe;
}
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
/ conversion function
static CDXLPhysicalAgg *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalAgg == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalAgg *>(dxl_op);
}
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *, BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLPhysicalAgg_H
/ EOF
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