greenplumn CDXLPhysicalIndexOnlyScan 源码
greenplumn CDXLPhysicalIndexOnlyScan 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLPhysicalIndexOnlyScan.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLPhysicalIndexOnlyScan.cpp
//
// @doc:
// Implementation of DXL physical index only scan operators
//---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLPhysicalIndexOnlyScan.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalIndexOnlyScan::CDXLPhysicalIndexOnlyScan
//
// @doc:
// Construct an index only scan node given its table descriptor,
// index descriptor and filter conditions on the index
//
//---------------------------------------------------------------------------
CDXLPhysicalIndexOnlyScan::CDXLPhysicalIndexOnlyScan(
CMemoryPool *mp, CDXLTableDescr *table_descr,
CDXLIndexDescr *dxl_index_descr, EdxlIndexScanDirection idx_scan_direction)
: CDXLPhysicalIndexScan(mp, table_descr, dxl_index_descr,
idx_scan_direction)
{
}
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalIndexOnlyScan::GetDXLOperator
//
// @doc:
// Operator type
//
//---------------------------------------------------------------------------
Edxlopid
CDXLPhysicalIndexOnlyScan::GetDXLOperator() const
{
return EdxlopPhysicalIndexOnlyScan;
}
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalIndexOnlyScan::GetOpNameStr
//
// @doc:
// Operator name
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLPhysicalIndexOnlyScan::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenPhysicalIndexOnlyScan);
}
// EOF
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