greenplumn CParseHandlerDXL 源码
greenplumn CParseHandlerDXL 代码
文件路径:/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerDXL.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerDXL.h
//
// @doc:
// SAX parse handler class for parsing a DXL document
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerDXL_H
#define GPDXL_CParseHandlerDXL_H
#include "gpos/base.h"
#include "gpos/common/CBitSet.h"
#include "gpopt/cost/ICostModelParams.h"
#include "gpopt/search/CSearchStage.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/md/CDXLStatsDerivedRelation.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerDXL
//
// @doc:
// Parse handler for DXL documents.
// Starting point for all other parse handlers
//
//---------------------------------------------------------------------------
class CParseHandlerDXL : public CParseHandlerBase
{
private:
// traceflags
CBitSet *m_trace_flags_bitset;
// optimizer config
COptimizerConfig *m_optimizer_config;
// MD request
CMDRequest *m_mdrequest;
// the root of the parsed DXL query
CDXLNode *m_query_dxl_root;
// list of query output columns
CDXLNodeArray *m_output_colums_dxl_array;
// list of CTE producers
CDXLNodeArray *m_cte_producers;
// the root of the parsed DXL plan
CDXLNode *m_plan_dxl_root;
// list of parsed metadata objects
IMDCacheObjectArray *m_mdid_cached_obj_array;
// list of parsed metadata ids
IMdIdArray *m_mdid_array;
// the root of the parsed scalar expression
CDXLNode *m_scalar_expr_dxl;
// list of source system ids
CSystemIdArray *m_system_id_array;
// list of parsed statistics objects
CDXLStatsDerivedRelationArray *m_dxl_stats_derived_rel_array;
// search strategy
CSearchStageArray *m_search_stage_array;
// plan Id
ULLONG m_plan_id;
// plan space size
ULLONG m_plan_space_size;
// cost model params
ICostModelParams *m_cost_model_params;
// 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;
// extract traceflags
void ExtractTraceFlags(CParseHandlerBase *parse_handler_base);
// extract optimizer config
void ExtractOptimizerConfig(CParseHandlerBase *parse_handler_base);
// extract a physical plan
void ExtractDXLPlan(CParseHandlerBase *parse_handler_base);
// extract metadata objects
void ExtractMetadataObjects(CParseHandlerBase *parse_handler_base);
// extract statistics
void ExtractStats(CParseHandlerBase *parse_handler_base);
// extract DXL query
void ExtractDXLQuery(CParseHandlerBase *parse_handler_base);
// extract mdids of requested objects
void ExtractMDRequest(CParseHandlerBase *parse_handler_base);
// extract search strategy
void ExtractSearchStrategy(CParseHandlerBase *parse_handler_base);
// extract cost params
void ExtractCostParams(CParseHandlerBase *parse_handler_base);
// extract a top level scalar expression
void ExtractScalarExpr(CParseHandlerBase *parse_handler_base);
// check if given element name is valid for starting DXL document
static BOOL IsValidStartElement(const XMLCh *const element_name);
public:
CParseHandlerDXL(const CParseHandlerDXL &) = delete;
// ctor
CParseHandlerDXL(CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr);
//dtor
~CParseHandlerDXL() override;
// traceflag bitset
CBitSet *Pbs() const;
// optimizer config
COptimizerConfig *GetOptimizerConfig() const;
// returns the root of the parsed DXL query
CDXLNode *GetQueryDXLRoot() const;
// returns the list of query output columns
CDXLNodeArray *GetOutputColumnsDXLArray() const;
// returns the list of CTE producers
CDXLNodeArray *GetCTEProducerDXLArray() const;
// returns the root of the parsed DXL plan
CDXLNode *PdxlnPlan() const;
// return the list of parsed metadata objects
IMDCacheObjectArray *GetMdIdCachedObjArray() const;
// return the list of parsed metadata ids
IMdIdArray *GetMdIdArray() const;
// return the MD request object
CMDRequest *GetMiniDumper() const;
// return the root of the parsed scalar expression
CDXLNode *GetScalarExprDXLRoot() const;
// return the list of parsed source system id objects
CSystemIdArray *GetSysidPtrArray() const;
// return the list of statistics objects
CDXLStatsDerivedRelationArray *GetStatsDerivedRelDXLArray() const;
// return search strategy
CSearchStageArray *GetSearchStageArray() const;
// return plan id
ULLONG GetPlanId() const;
// return plan space size
ULLONG GetPlanSpaceSize() const;
// return cost params
ICostModelParams *GetCostModelParams() const;
// process the end of the document
void endDocument() override;
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerDXL_H
// EOF
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