greenplumn CStatsPredConj 代码
文件路径：/src/backend/gporca/libnaucrates/src/statistics/CStatsPredConj.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CStatsPredConj.cpp
/
/ @doc:
/ Implementation of statistics Conjunctive filter
/---------------------------------------------------------------------------
#include "naucrates/statistics/CStatsPredConj.h"
#include "naucrates/statistics/CStatisticsUtils.h"
using namespace gpnaucrates;
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CStatsPredConj::CStatsPredConj
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CStatsPredConj::CStatsPredConj(CStatsPredPtrArry *conj_pred_stats_array)
: CStatsPred(gpos::ulong_max),
m_conj_pred_stats_array(conj_pred_stats_array)
{
GPOS_ASSERT(nullptr != conj_pred_stats_array);
m_colid = CStatisticsUtils::GetColId(conj_pred_stats_array);
}
/---------------------------------------------------------------------------
/ @function:
/ CStatsPredConj::GetPredStats
/
/ @doc:
/ Return the filter at a particular position
/
/---------------------------------------------------------------------------
CStatsPred *
CStatsPredConj::GetPredStats(ULONG pos) const
{
return (*m_conj_pred_stats_array)[pos];
}
/---------------------------------------------------------------------------
/ @function:
/ CStatsPredConj::Sort
/
/ @doc:
/ Sort the components of the disjunction
/
/---------------------------------------------------------------------------
void
CStatsPredConj::Sort() const
{
if (1 < GetNumPreds())
{
/ sort the filters on column ids
m_conj_pred_stats_array->Sort(CStatsPred::StatsPredSortCmpFunc);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CStatsPredConj::GetColId
/
/ @doc:
/ Return the column identifier on which the predicates are on
/
/---------------------------------------------------------------------------
ULONG
CStatsPredConj::GetColId() const
{
return m_colid;
}
/ EOF
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