99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of 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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The operator "genRel"[2] is used to generate nested relations of several forms
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for testing. It features the possibility to build relations of types
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"nrel2"[2] and "arel2"[2], "nrel"[2] and "arel"[2] as well as "record"[2] and
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"vector"[2]. It is possible to nest them to arbitrary depth.
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Relations can contain a specifiable amount of attributes of different atomic
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types and can grow to an arbitrary length given. For attributes of types
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"string"[2] and "text"[2] the length is definable. Furthermore the selectivity
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can be adjusted to support the testing of filter conditions.
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*/
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#ifndef ALGEBRAS_NESTEDRELATION2_OPERATORS_GENREL_H_
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#define ALGEBRAS_NESTEDRELATION2_OPERATORS_GENREL_H_
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#include "Stream.h"
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namespace nr2a {
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class GenRel
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{
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public:
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struct Info : OperatorInfo
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{
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Info()
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{
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name = "genRel";
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signature = "\"nrel\" x string x int x int x string x int x int x "
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"RELTYPE -> nrel(tuple(X))";
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appendSignature(
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"\"arel\" x string x int x int x string x int x int x "
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"RELTYPE -> arel(tuple(X))");
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appendSignature(
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"\"nrel2\" x string x int x int x string x int x int x "
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"RELTYPE -> nrel2(tuple(X))");
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appendSignature(
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"\"arel2\" x string x int x int x string x int x int x "
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"RELTYPE -> arel2(tuple(X))");
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appendSignature(
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"\"vector\" x string x int x int x string x int x int x "
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"RELTYPE -> vector(record(X))");
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syntax = "genRel(_, _, _, _, _, _, _)";
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meaning =
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"Produces a nested relation for testing. The parameters "
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"are (left to right):\n"
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"Resulting type, names prefix, number of attributes, "
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"number of tuples, attributes type, string length, "
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"selectivity, data of subrelation where "
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"RELTYPE is one of arel(tuple(X)), arel2(tuple(X)), "
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"vector(record(X))\n"
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"attributes type may be: bool, int, real, string or text";
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example = "query genRel(\"nrel2\", \"Attr\", 10, 100, \"int\", "
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"0, 0, undefined) consume";
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}
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};
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virtual ~GenRel();
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static ListExpr MapType(ListExpr args);
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static ValueMapping functions[];
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static int SelectFunction(ListExpr args);
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static int GenRelValue(Word* args, Word& result, int message,
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Word& local, Supplier s);
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static CreateCostEstimation costEstimators[];
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protected:
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private:
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GenRel(); // Declared, but not defined => Linker error on usage
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};
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} /* namespace nr2a*/
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#endif /* ALGEBRAS_NESTEDRELATION2_OPERATORS_GENREL_H_*/
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