105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
/*
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2004, University in Hagen, Department of Computer Science,
|
|
Database Systems for New Applications.
|
|
|
|
SECONDO is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
SECONDO is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with SECONDO; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
----
|
|
|
|
1.1 Count
|
|
|
|
*/
|
|
|
|
#include "BlockingProgressEstimator.h"
|
|
#include "Include.h"
|
|
|
|
|
|
using namespace nr2a;
|
|
|
|
Count::~Count()
|
|
{
|
|
}
|
|
|
|
/*
|
|
"Count"[2] accepts "nrel2"[2] and "arel2"[2] as input and always outputs an
|
|
"int"[2].
|
|
|
|
*/
|
|
/*static*/ListExpr Count::MapType(ListExpr args)
|
|
{
|
|
if (nl->HasLength(args, 1))
|
|
{
|
|
if (Nr2aHelper::IsNestedRelation(nl->First(args)))
|
|
{
|
|
return nl->SymbolAtom(CcInt::BasicType());
|
|
}
|
|
}
|
|
return listutils::typeError("Expecting nrel2 or arel2 as input");
|
|
}
|
|
|
|
ValueMapping Count::functions[] = { CountArel, CountNrel, NULL };
|
|
|
|
/*static*/int Count::SelectFunction(ListExpr args)
|
|
{
|
|
return Nr2aHelper::DefaultSelect(nl->First(args));
|
|
}
|
|
|
|
/*
|
|
Both types of relations offer an function to request their amount of tuples.
|
|
|
|
*/
|
|
/*static*/int Count::CountArel(Word* args, Word& result, int message,
|
|
Word& local, Supplier s)
|
|
{
|
|
int resultInt = 0;
|
|
//if (message == OPEN)
|
|
{
|
|
ARel *arel = static_cast<ARel*>(args[0].addr);
|
|
|
|
result = qp->ResultStorage(s);
|
|
CcInt* resultValue = static_cast<CcInt*>(result.addr);
|
|
int resultInt = arel->GetTupleCount();
|
|
|
|
resultValue->Set(true, resultInt);
|
|
}
|
|
return resultInt;
|
|
}
|
|
|
|
/*static*/int Count::CountNrel(Word* args, Word& result, int message,
|
|
Word& local, Supplier s)
|
|
{
|
|
int resultInt = 0;
|
|
//if (message == OPEN)
|
|
{
|
|
NRel *nrel = static_cast<NRel*>(args[0].addr);
|
|
|
|
result = qp->ResultStorage(s);
|
|
CcInt* resultValue = static_cast<CcInt*>(result.addr);
|
|
int resultInt = nrel->GetTupleCount();
|
|
|
|
resultValue->Set(true, resultInt);
|
|
}
|
|
return resultInt;
|
|
}
|
|
|
|
/*
|
|
List of functions for cost estimation.
|
|
|
|
*/
|
|
CreateCostEstimation Count::costEstimators[] =
|
|
{ BlockingProgressEstimator::Build, BlockingProgressEstimator::Build };
|