greenplumn ICostModel 源码
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
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