morrySnow commented on code in PR #9018: URL: https://github.com/apache/incubator-doris/pull/9018#discussion_r851648147
########## fe/fe-core/src/main/java/org/apache/doris/rewrite/RewriteSelfCmpRule.java: ########## @@ -0,0 +1,57 @@ +// 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.BoolLiteral; +import org.apache.doris.analysis.Expr; +import org.apache.doris.analysis.IsNullPredicate; +import org.apache.doris.analysis.SlotRef; +import org.apache.doris.common.AnalysisException; + +/** + * Rewrites predicate which is self compare self like A = A. + * =, >= , <=: where col is not null; + * <, >, !=: where false; + * <=>: where true; + */ +public class RewriteSelfCmpRule implements ExprRewriteRule { + public static ExprRewriteRule INSTANCE = new RewriteSelfCmpRule(); + + @Override + public Expr apply(Expr expr, Analyzer analyzer, ExprRewriter.ClauseType clauseType) throws AnalysisException { + if (!(expr instanceof BinaryPredicate) || !(expr.getChild(0) instanceof SlotRef) + || !expr.getChild(0).equals(expr.getChild(1))) + return expr; + + switch (((BinaryPredicate) expr).getOp()) { + case EQ: + case LE: + case GE: + return new IsNullPredicate(expr.getChild(0), true); + case NE: Review Comment: > I check `SlotRef` typle in line 39. SlotRef not resolve this problem. we need to check clause on where -- 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
