greenplumn CDXLScalarWindowRef 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarWindowRef.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLScalarWindowRef.h
/
/ @doc:
/ Class for representing DXL scalar WindowRef
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarWindowRef_H
#define GPDXL_CDXLScalarWindowRef_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
/ stage of the evaluation of the window function
enum EdxlWinStage
{
EdxlwinstageImmediate = 0,
EdxlwinstagePreliminary,
EdxlwinstageRowKey,
EdxlwinstageSentinel
};
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarWindowRef
/
/ @doc:
/ Class for representing DXL scalar WindowRef
/
/---------------------------------------------------------------------------
class CDXLScalarWindowRef : public CDXLScalar
{
private:
/ catalog id of the function
IMDId *m_func_mdid;
/ return type
IMDId *m_return_type_mdid;
/ denotes whether it's agg(DISTINCT ...)
BOOL m_is_distinct;
/ is argument list really '*' /
BOOL m_is_star_arg;
/ is function a simple aggregate? /
BOOL m_is_simple_agg;
/ denotes the win stage
EdxlWinStage m_dxl_win_stage;
/ position the window specification in a parent window operator
ULONG m_win_spec_pos;
public:
CDXLScalarWindowRef(const CDXLScalarWindowRef &) = delete;
/ ctor
CDXLScalarWindowRef(CMemoryPool *mp, IMDId *pmdidWinfunc,
IMDId *mdid_return_type, BOOL is_distinct,
BOOL is_star_arg, BOOL is_simple_agg,
EdxlWinStage dxl_win_stage, ULONG ulWinspecPosition);
/dtor
~CDXLScalarWindowRef() override;
/ ident accessors
Edxlopid GetDXLOperator() const override;
/ name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
/ catalog id of the function
IMDId *
FuncMdId() const
{
return m_func_mdid;
}
/ return type of the function
IMDId *
ReturnTypeMdId() const
{
return m_return_type_mdid;
}
/ window stage
EdxlWinStage
GetDxlWinStage() const
{
return m_dxl_win_stage;
}
/ denotes whether it's agg(DISTINCT ...)
BOOL
IsDistinct() const
{
return m_is_distinct;
}
BOOL
IsStarArg() const
{
return m_is_star_arg;
}
BOOL
IsSimpleAgg() const
{
return m_is_simple_agg;
}
/ position the window specification in a parent window operator
ULONG
GetWindSpecPos() const
{
return m_win_spec_pos;
}
/ set window spec position
void
SetWinSpecPos(ULONG win_spec_pos)
{
m_win_spec_pos = win_spec_pos;
}
/ string representation of win stage
const CWStringConst *GetWindStageStr() const;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
/ conversion function
static CDXLScalarWindowRef *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarWindowRef == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarWindowRef *>(dxl_op);
}
/ does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarWindowRef_H
/ EOF
相关信息
相关文章
greenplumn CDXLCtasStorageOptions 源码