greenplumn CParseHandlerColStats 源码
greenplumn CParseHandlerColStats 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerColStats.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerColStats.h
//
// @doc:
// SAX parse handler class for parsing base relation column stats objects
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerColStats_H
#define GPDXL_CParseHandlerColStats_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataObject.h"
// fwd decl
namespace gpmd
{
class CMDIdColStats;
}
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
using namespace gpnaucrates;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerColStats
//
// @doc:
// Parse handler class for base relation column stats
//
//---------------------------------------------------------------------------
class CParseHandlerColStats : public CParseHandlerMetadataObject
{
private:
// mdid of the col stats object
CMDIdColStats *m_mdid;
// name of the column
CMDName *m_md_name;
// column width
CDouble m_width;
// null fraction
CDouble m_null_freq;
// ndistinct of remaining tuples
CDouble m_distinct_remaining;
// frequency of remaining tuples
CDouble m_freq_remaining;
// is the column statistics missing in the database
BOOL m_is_column_stats_missing;
// 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:
CParseHandlerColStats(const CParseHandlerColStats &) = delete;
// ctor
CParseHandlerColStats(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_base);
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerColStats_H
// EOF
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