greenplumn CParseHandlerQuery 源码
greenplumn CParseHandlerQuery 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerQuery.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerQuery.h
//
// @doc:
// Parse handler for converting a query (logical plan) from a DXL document
// into a DXL tree.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerQuery_H
#define GPDXL_CParseHandlerQuery_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerQuery
//
// @doc:
// Parse handler for converting a query (logical plan) from a DXL document
// into a DXL tree.
//---------------------------------------------------------------------------
class CParseHandlerQuery : public CParseHandlerBase
{
private:
// the root of the parsed DXL tree constructed by the parse handler
CDXLNode *m_dxl_node;
// list of output columns (represented as scalar ident nodes)
CDXLNodeArray *m_output_colums_dxl_array;
// list of CTE priducers
CDXLNodeArray *m_cte_producers;
// 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;
public:
// private ctor
CParseHandlerQuery(const CParseHandlerQuery &) = delete;
// ctor/dtor
CParseHandlerQuery(CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
~CParseHandlerQuery() override;
// returns the root of constructed DXL plan
CDXLNode *CreateDXLNode() const;
// returns the dxl representation of the query output
CDXLNodeArray *GetOutputColumnsDXLArray() const;
// returns the CTEs
CDXLNodeArray *GetCTEProducerDXLArray() const;
EDxlParseHandlerType GetParseHandlerType() const override;
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerQuery_H
// EOF
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