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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