greenplumn CDXLPhysicalIndexScan 源码
greenplumn CDXLPhysicalIndexScan 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalIndexScan.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLPhysicalIndexScan.h
//
// @doc:
// Class for representing DXL index scan operators
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalIndexScan_H
#define GPDXL_CDXLPhysicalIndexScan_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLIndexDescr.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLPhysical.h"
#include "naucrates/dxl/operators/CDXLTableDescr.h"
namespace gpdxl
{
// indices of index scan elements in the children array
enum Edxlis
{
EdxlisIndexProjList = 0,
EdxlisIndexFilter,
EdxlisIndexCondition,
EdxlisSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalIndexScan
//
// @doc:
// Class for representing DXL index scan operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalIndexScan : public CDXLPhysical
{
private:
// table descriptor for the scanned table
CDXLTableDescr *m_dxl_table_descr;
// index descriptor associated with the scanned table
CDXLIndexDescr *m_dxl_index_descr;
// scan direction of the index
EdxlIndexScanDirection m_index_scan_dir;
public:
CDXLPhysicalIndexScan(CDXLPhysicalIndexScan &) = delete;
//ctor
CDXLPhysicalIndexScan(CMemoryPool *mp, CDXLTableDescr *table_descr,
CDXLIndexDescr *dxl_index_descr,
EdxlIndexScanDirection idx_scan_direction);
//dtor
~CDXLPhysicalIndexScan() override;
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// index descriptor
virtual const CDXLIndexDescr *GetDXLIndexDescr() const;
//table descriptor
virtual const CDXLTableDescr *GetDXLTableDescr() const;
// scan direction
virtual EdxlIndexScanDirection GetIndexScanDir() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLPhysicalIndexScan *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalIndexScan == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalIndexScan *>(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_CDXLPhysicalIndexScan_H
// EOF
相关信息
相关文章
greenplumn CDXLCtasStorageOptions 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony