wangshuo128 commented on a change in pull request #7357: URL: https://github.com/apache/incubator-doris/pull/7357#discussion_r775403872
########## File path: fe/fe-core/src/main/java/org/apache/doris/rewrite/InferFiltersRule.java ########## @@ -0,0 +1,675 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +package org.apache.doris.rewrite; + +import org.apache.doris.analysis.Analyzer; +import org.apache.doris.analysis.BinaryPredicate; +import org.apache.doris.analysis.CompoundPredicate; +import org.apache.doris.analysis.Expr; +import org.apache.doris.analysis.InPredicate; +import org.apache.doris.analysis.IsNullPredicate; +import org.apache.doris.analysis.JoinOperator; +import org.apache.doris.analysis.LiteralExpr; +import org.apache.doris.analysis.SlotRef; +import org.apache.doris.analysis.TupleId; +import org.apache.doris.common.AnalysisException; +import org.apache.doris.common.Pair; + +import com.google.common.collect.Sets; + +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Set; +import java.util.Map; + +/** + * The function of this rule is to derive a new predicate based on the current predicate. + * eg. + * t1.id = t2.id and t2.id = t3.id and t3.id = 100; + * --> + * t1.id = 100 and t2.id = 100 and t3.id = 100; + * + * 1. Register a new rule InferFiltersRule and add it to GlobalState. + * 2. Traverse Conjunct to construct on/where equivalence connection, numerical connection and isNullPredicate. + * 3. Use Warshall to infer all equivalence connections Review comment: It's better to add a link to the "Warshll" algorithm, i.e., a link in Wikipedia, which people could refer to for more details. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
