greenplumn CParseHandlerIndexScan 源码
greenplumn CParseHandlerIndexScan 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerIndexScan.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerIndexScan.h
//
// @doc:
// SAX parse handler class for parsing index scan operator nodes
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerIndexScan_H
#define GPDXL_CParseHandlerIndexScan_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysicalIndexScan.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
#include "naucrates/dxl/xml/dxltokens.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerIndexScan
//
// @doc:
// Parse handler for index scan operator nodes
//
//---------------------------------------------------------------------------
class CParseHandlerIndexScan : public CParseHandlerPhysicalOp
{
private:
// index scan direction
EdxlIndexScanDirection m_index_scan_dir;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
protected:
// common StartElement functionality for IndexScan and IndexOnlyScan
void StartElementHelper(const XMLCh *const element_local_name,
const Attributes &attrs, Edxltoken token_type);
// common EndElement functionality for IndexScan and IndexOnlyScan
void EndElementHelper(const XMLCh *const element_local_name,
Edxltoken token_type,
ULongPtrArray *selector_ids = nullptr);
public:
CParseHandlerIndexScan(const CParseHandlerIndexScan &) = delete;
// ctor
CParseHandlerIndexScan(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerIndexScan_H
// EOF
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