greenplumn ICostModel 代码
文件路径：/src/backend/gporca/libgpdbcost/src/ICostModel.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ ICostModel.cpp
/
/ @doc:
/ Cost model implementation
/---------------------------------------------------------------------------
#include "gpos/base.h"
#include "gpos/string/CWStringConst.h"
#include "gpdbcost/CCostModelGPDB.h"
using namespace gpopt;
using namespace gpdbcost;
/ default number segments for the cost model
#define GPOPT_DEFAULT_SEGMENT_COUNT 2
/---------------------------------------------------------------------------
/ @function:
/ ICostModel::PcmDefault
/
/ @doc:
/ Create default cost model
/
/---------------------------------------------------------------------------
ICostModel *
ICostModel::PcmDefault(CMemoryPool *mp)
{
return GPOS_NEW(mp) CCostModelGPDB(mp, GPOPT_DEFAULT_SEGMENT_COUNT);
}
/---------------------------------------------------------------------------
/ @function:
/ ICostModel::SetParams
/
/ @doc:
/ Set cost model params
/
/---------------------------------------------------------------------------
void
ICostModel::SetParams(ICostModelParamsArray *pdrgpcp) const
{
if (nullptr == pdrgpcp)
{
return;
}
/ overwrite default values of cost model parameters
const ULONG size = pdrgpcp->Size();
for (ULONG ul = 0; ul < size; ul++)
{
ICostModelParams::SCostParam *pcp = (*pdrgpcp)[ul];
GetCostModelParams()->SetParam(pcp->Id(), pcp->Get(),
pcp->GetLowerBoundVal(),
pcp->GetUpperBoundVal());
}
}
/ EOF