leaves12138 commented on code in PR #6776: URL: https://github.com/apache/paimon/pull/6776#discussion_r2600881645
########## paimon-common/src/main/java/org/apache/paimon/predicate/LikeOptimization.java: ########## @@ -0,0 +1,74 @@ +/* + * 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.paimon.predicate; + +import org.apache.paimon.data.BinaryString; +import org.apache.paimon.utils.Pair; + +import java.util.Optional; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +import static org.apache.paimon.data.BinaryString.fromString; + +/** Try to optimize like to startsWith, endsWith, contains or equals. */ +public class LikeOptimization { + + /** Accepts simple LIKE patterns like "abc%". */ + private static final Pattern BEGIN_PATTERN = Pattern.compile("([^%]+)%"); + /** Accepts simple LIKE patterns like "%abc". */ + private static final Pattern END_PATTERN = Pattern.compile("%([^%]+)"); + /** Accepts simple LIKE patterns like "%abc%". */ + private static final Pattern MIDDLE_PATTERN = Pattern.compile("%([^%]+)%"); + /** Accepts simple LIKE patterns like "abc". */ + private static final Pattern NONE_PATTERN = Pattern.compile("[^%]+"); + + public static Optional<Pair<NullFalseLeafBinaryFunction, Object>> tryOptimize( + Object patternLiteral) { + if (patternLiteral == null) { + throw new IllegalArgumentException("Pattern can not be null."); + } + + String pattern = patternLiteral.toString(); + if (pattern.contains("_")) { Review Comment: pattern.replace("\\_", "\u0000").contains("\_") to enable pattern like "%my\\_house"? -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
