greenplumn CDXLLogicalGroupBy 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalGroupBy.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLLogicalGroupBy.h
/
/ @doc:
/ Class for representing DXL logical group by operators
/
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalGroupBy_H
#define GPDXL_CDXLLogicalGroupBy_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
#include "naucrates/dxl/operators/CDXLNode.h"
namespace gpdxl
{
/---------------------------------------------------------------------------
/ @class:
/ CDXLLogicalGroupBy
/
/ @doc:
/ Class for representing DXL logical group by operators
/
/---------------------------------------------------------------------------
class CDXLLogicalGroupBy : public CDXLLogical
{
private:
/ grouping column ids
ULongPtrArray *m_grouping_colid_array;
/ serialize output grouping columns indices in DXL
void SerializeGrpColsToDXL(CXMLSerializer *) const;
public:
CDXLLogicalGroupBy(CDXLLogicalGroupBy &) = delete;
/ ctors
explicit CDXLLogicalGroupBy(CMemoryPool *mp);
CDXLLogicalGroupBy(CMemoryPool *mp, ULongPtrArray *pdrgpulGrpColIds);
/ dtor
~CDXLLogicalGroupBy() override;
/ accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
const ULongPtrArray *GetGroupingColidArray() const;
/ set grouping column indices
void SetGroupingColumns(ULongPtrArray *);
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
/ conversion function
static CDXLLogicalGroupBy *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalGrpBy == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalGroupBy *>(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_CDXLLogicalGroupBy_H
/ EOF
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