74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2016,
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Faculty of Mathematics and Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//[$][\$]
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//[_][\_]
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*/
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#ifndef ALGEBRAS_RELATION_C___OPERATORPROJECT_H_
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#define ALGEBRAS_RELATION_C___OPERATORPROJECT_H_
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#include "Operator.h"
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class OperatorProject
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{
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public:
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/*
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5.9 Operator ~project~
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5.9.1 Type mapping function of operator ~project~
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Result type of project operation.
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---- ((stream (tuple ((x1 T1) ... (xn Tn)))) (ai1 ... aik)) ->
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(APPEND
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(k (i1 ... ik))
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(stream (tuple ((ai1 Ti1) ... (aik Tik))))
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)
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----
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The type mapping computes the number of attributes and the list of
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attribute numbers for the given projection attributes and asks the
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query processor to append it to the given arguments.
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*/
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static ListExpr ProjectTypeMap(ListExpr args);
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/*
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5.9.2 Value mapping function of operator ~project~
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*/
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static int
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Project(Word* args, Word& result, int message,
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Word& local, Supplier s);
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# ifdef USE_PROGRESS
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static CostEstimation* ProjectCostEstimationFunc();
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#endif
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};
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#endif /* ALGEBRAS_RELATION_C___OPERATORPROJECT_H_ */
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