75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
|
/*
|
||
|
|
----
|
||
|
|
This file is part of SECONDO.
|
||
|
|
|
||
|
|
Copyright (C) 2016,
|
||
|
|
Faculty of Mathematics and 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
|
||
|
|
----
|
||
|
|
|
||
|
|
|
||
|
|
//[$][\$]
|
||
|
|
//[_][\_]
|
||
|
|
|
||
|
|
*/
|
||
|
|
#ifndef ALGEBRAS_RELATION_C___OPERATORFEED_H_
|
||
|
|
#define ALGEBRAS_RELATION_C___OPERATORFEED_H_
|
||
|
|
|
||
|
|
#include "Operator.h"
|
||
|
|
|
||
|
|
class OperatorFeed
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
5.5 Operator ~feed~
|
||
|
|
|
||
|
|
Produces a stream from a relation by scanning the relation tuple by
|
||
|
|
tuple.
|
||
|
|
|
||
|
|
5.5.1 Type mapping function of operator ~feed~
|
||
|
|
|
||
|
|
A type mapping function takes a nested list as argument. Its
|
||
|
|
contents are type descriptions of an operator's input parameters.
|
||
|
|
A nested list describing the output type of the operator is returned.
|
||
|
|
|
||
|
|
Result type of feed operation.
|
||
|
|
|
||
|
|
---- ((rel x)) -> (stream x)
|
||
|
|
----
|
||
|
|
|
||
|
|
*/
|
||
|
|
static ListExpr FeedTypeMap(ListExpr args);
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
5.5.2 Value mapping function of operator ~feed~
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
static int
|
||
|
|
Feed(Word* args, Word& result, int message, Word& local, Supplier s);
|
||
|
|
|
||
|
|
#ifdef USE_PROGRESS
|
||
|
|
static CostEstimation* FeedCostEstimationFunc();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* ALGEBRAS_RELATION_C___OPERATORFEED_H_ */
|