greenplumn CParseHandlerStatsDerivedRelation 源码
greenplumn CParseHandlerStatsDerivedRelation 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerStatsDerivedRelation.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerStatsDerivedRelation.h
//
// @doc:
// SAX parse handler class for parsing derived relation statistics
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerStatsDerivedRelation_H
#define GPDXL_CParseHandlerStatsDerivedRelation_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/md/CDXLStatsDerivedRelation.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
using namespace gpnaucrates;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerStatsDerivedRelation
//
// @doc:
// Base parse handler class for derived relation statistics
//
//---------------------------------------------------------------------------
class CParseHandlerStatsDerivedRelation : public CParseHandlerBase
{
private:
// number of rows in the relation
CDouble m_rows;
// flag to express that the statistics is on an empty input
BOOL m_empty;
// number of blocks in the relation (not always up to-to-date)
ULONG m_relpages;
// number of all-visible blocks in the relation (not always up-to-date)
ULONG m_relallvisible;
// relation stats
CDXLStatsDerivedRelation *m_dxl_stats_derived_relation;
// 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:
CParseHandlerStatsDerivedRelation(
const CParseHandlerStatsDerivedRelation &) = delete;
// ctor
CParseHandlerStatsDerivedRelation(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// dtor
~CParseHandlerStatsDerivedRelation() override;
// the derived relation stats
CDXLStatsDerivedRelation *
GetDxlStatsDrvdRelation() const
{
return m_dxl_stats_derived_relation;
}
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerStatsDerivedRelation_H
// EOF
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