greenplumn CDXLPhysicalAppend 源码

greenplumn CDXLPhysicalAppend 代码

文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalAppend.h

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 Greenplum, Inc.
//
//	@filename:
//		CDXLPhysicalAppend.h
//
//	@doc:
//		Class for representing DXL append operators.
//---------------------------------------------------------------------------



#ifndef GPDXL_CDXLPhysicalAppend_H
#define GPDXL_CDXLPhysicalAppend_H

#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
#include "gpos/common/CDynamicPtrArray.h"

#include "naucrates/dxl/operators/CDXLPhysical.h"
#include "naucrates/dxl/operators/CDXLTableDescr.h"

namespace gpdxl
{
// indices of append elements in the children array
enum Edxlappend
{
	EdxlappendIndexProjList = 0,
	EdxlappendIndexFilter,
	EdxlappendIndexFirstChild,
	EdxlappendIndexSentinel
};

//---------------------------------------------------------------------------
//	@class:
//		CDXLPhysicalAppend
//
//	@doc:
//		Class for representing DXL Append operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalAppend : public CDXLPhysical
{
private:
	// is the append node used in an update/delete statement
	BOOL m_used_in_upd_del = false;

	// TODO:  - Apr 12, 2011; find a better name (and comments) for this variable
	BOOL m_is_zapped = false;

	// scan id from the CPhysicalDynamicTableScan (a.k.a part_index_id)
	// when m_scan_id != gpos::ulong_max
	ULONG m_scan_id = gpos::ulong_max;

	// table descr of the root partitioned table (when translated from a CPhysicalDynamicTableScan)
	CDXLTableDescr *m_dxl_table_descr = nullptr;

	ULongPtrArray *m_selector_ids = nullptr;

public:
	CDXLPhysicalAppend(const CDXLPhysicalAppend &) = delete;

	// ctor/dtor
	CDXLPhysicalAppend(CMemoryPool *mp, BOOL fIsTarget, BOOL fIsZapped);

	// ctor for partitioned table scan
	CDXLPhysicalAppend(CMemoryPool *mp, BOOL fIsTarget, BOOL fIsZapped,
					   ULONG scan_id, CDXLTableDescr *dxl_table_desc,
					   ULongPtrArray *selector_ids);

	// dtor
	~CDXLPhysicalAppend() override;

	// accessors
	Edxlopid GetDXLOperator() const override;
	const CWStringConst *GetOpNameStr() const override;

	BOOL IsUsedInUpdDel() const;
	BOOL IsZapped() const;

	CDXLTableDescr *
	GetDXLTableDesc() const
	{
		return m_dxl_table_descr;
	}

	void
	SetDXLTableDesc(CDXLTableDescr *dxl_table_desc)
	{
		m_dxl_table_descr = dxl_table_desc;
	}

	ULONG
	GetScanId() const
	{
		return m_scan_id;
	}

	const ULongPtrArray *
	GetSelectorIds() const
	{
		return m_selector_ids;
	}

	// serialize operator in DXL format
	void SerializeToDXL(CXMLSerializer *xml_serializer,
						const CDXLNode *dxlnode) const override;

	// conversion function
	static CDXLPhysicalAppend *
	Cast(CDXLOperator *dxl_op)
	{
		GPOS_ASSERT(nullptr != dxl_op);
		GPOS_ASSERT(EdxlopPhysicalAppend == dxl_op->GetDXLOperator());

		return dynamic_cast<CDXLPhysicalAppend *>(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_CDXLPhysicalAppend_H

// EOF

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