Source Code Cross Referenced for OptimizableList.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » sql » compile » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.sql.compile 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.iapi.sql.compile.OptimizableList
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.iapi.sql.compile;
023:
024:        import org.apache.derby.iapi.error.StandardException;
025:
026:        import org.apache.derby.iapi.sql.dictionary.DataDictionary;
027:
028:        /**
029:         * OptimizableList provides services for optimizing a list of
030:         * Optimizables (tables) in a query.
031:         */
032:
033:        public interface OptimizableList {
034:
035:            /**
036:             *  Return the number of Optimizables in the list.
037:             *
038:             *  @return integer		The number of Optimizables in the list.
039:             */
040:            public int size();
041:
042:            /**
043:             *  Return the nth Optimizable in the list.
044:             *
045:             *  @param n				"index" (0 based) into the list.
046:             *
047:             *  @return Optimizable		The nth Optimizables in the list.
048:             */
049:            public Optimizable getOptimizable(int n);
050:
051:            /**
052:             * Set the nth Optimizable to the specified Optimizable.
053:             *
054:             *  @param n				"index" (0 based) into the list.
055:             *  @param optimizable		New nth Optimizable.
056:             */
057:            public void setOptimizable(int n, Optimizable optimizable);
058:
059:            /** 
060:             * Verify that the Properties list with optimizer overrides, if specified, is valid
061:             *
062:             * @param dDictionary	The DataDictionary to use.
063:             *
064:             * @exception StandardException		Thrown on error
065:             */
066:            public void verifyProperties(DataDictionary dDictionary)
067:                    throws StandardException;
068:
069:            /**
070:             * Set the join order for this list of optimizables.  The join order is
071:             * represented as an array of integers - each entry in the array stands
072:             * for the order of the corresponding element in the list.  For example,
073:             * a joinOrder of {2, 0, 1} means that the 3rd Optimizable in the list
074:             * (element 2, since we are zero-based) is the first one in the join
075:             * order, followed by the 1st element in the list, and finally by the
076:             * 2nd element in the list.
077:             *
078:             * This method shuffles this OptimizableList to match the join order.
079:             *
080:             * Obviously, the size of the array must equal the number of elements in
081:             * the array, and the values in the array must be between 0 and the
082:             * number of elements in the array minus 1, and the values in the array
083:             * must be unique.
084:             */
085:            public void reOrder(int[] joinOrder);
086:
087:            /**
088:             * user can specify that s/he doesn't want statistics to be considered when
089:             * optimizing the query.
090:             */
091:            public boolean useStatistics();
092:
093:            /**
094:             * Tell whether the join order should be optimized.
095:             */
096:            public boolean optimizeJoinOrder();
097:
098:            /**
099:             * Tell whether the join order is legal.
100:             */
101:            public boolean legalJoinOrder(int numTablesInQuery);
102:
103:            /**
104:             * Init the access paths for these optimizables.
105:             *
106:             * @param optimizer The optimizer being used.
107:             */
108:            public void initAccessPaths(Optimizer optimizer);
109:        }
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