greenplumn CStatisticsConfig 源码
greenplumn CStatisticsConfig 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/engine/CStatisticsConfig.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CStatisticsConfig.h
//
// @doc:
// Statistics configurations
//---------------------------------------------------------------------------
#ifndef GPOPT_CStatisticsConfig_H
#define GPOPT_CStatisticsConfig_H
#include "gpos/base.h"
#include "gpos/common/CDouble.h"
#include "gpos/common/CRefCount.h"
#include "gpos/memory/CMemoryPool.h"
#include "naucrates/md/CMDIdColStats.h"
#include "naucrates/md/IMDId.h"
#define MAX_STATS_BUCKETS ULONG(100)
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CStatisticsConfig
//
// @doc:
// Statistics configurations
//
//---------------------------------------------------------------------------
class CStatisticsConfig : public CRefCount
{
private:
// shared memory pool
CMemoryPool *m_mp;
// damping factor for filter
CDouble m_damping_factor_filter;
// damping factor for join
CDouble m_damping_factor_join;
// damping factor for group by
CDouble m_damping_factor_groupby;
// max stats buckets for combining histograms
// See CHistogram::MakeUnionAllHistogramNormalize/MakeUnionHistogramNormalize
ULONG m_max_stats_buckets;
// hash set of md ids for columns with missing statistics
MdidHashSet *m_phsmdidcolinfo;
public:
// ctor
CStatisticsConfig(CMemoryPool *mp, CDouble damping_factor_filter,
CDouble damping_factor_join,
CDouble damping_factor_groupby, ULONG max_stats_buckets);
// dtor
~CStatisticsConfig() override;
// damping factor for filter
CDouble
DDampingFactorFilter() const
{
return m_damping_factor_filter;
}
// damping factor for join
CDouble
DDampingFactorJoin() const
{
return m_damping_factor_join;
}
// damping factor for group by
CDouble
DDampingFactorGroupBy() const
{
return m_damping_factor_groupby;
}
// max stats buckets for combining histograms
ULONG
UlMaxStatsBuckets() const
{
return m_max_stats_buckets;
}
// add the information about the column with the missing statistics
void AddMissingStatsColumn(CMDIdColStats *pmdidCol);
// collect the missing statistics columns
void CollectMissingStatsColumns(IMdIdArray *pdrgmdid);
// generate default optimizer configurations
static CStatisticsConfig *
PstatsconfDefault(CMemoryPool *mp)
{
return GPOS_NEW(mp) CStatisticsConfig(
mp, 0.75 /* damping_factor_filter */,
0.01 /* damping_factor_join */, 0.75 /* damping_factor_groupby */,
MAX_STATS_BUCKETS);
}
}; // class CStatisticsConfig
} // namespace gpopt
#endif // !GPOPT_CStatisticsConfig_H
// EOF
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