greenplumn CParseHandlerStatsDerivedColumn 源码
greenplumn CParseHandlerStatsDerivedColumn 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerStatsDerivedColumn.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerStatsDerivedColumn.h
//
// @doc:
// Parse handler for derived column statistics
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerStatsDerivedColumn_H
#define GPDXL_CParseHandlerStatsDerivedColumn_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/md/CDXLStatsDerivedColumn.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerStatsDerivedColumn
//
// @doc:
// Parse handler for derived column statistics
//
//---------------------------------------------------------------------------
class CParseHandlerStatsDerivedColumn : public CParseHandlerBase
{
private:
// column id
ULONG m_colid;
// 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;
// derived column stats
CDXLStatsDerivedColumn *m_dxl_stats_derived_col;
// 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:
CParseHandlerStatsDerivedColumn(const CParseHandlerStatsDerivedColumn &) =
delete;
// ctor
CParseHandlerStatsDerivedColumn(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
//dtor
~CParseHandlerStatsDerivedColumn() override;
// derived column stats
CDXLStatsDerivedColumn *
GetDxlStatsDerivedCol() const
{
return m_dxl_stats_derived_col;
}
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerStatsDerivedColumn_H
// EOF
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