chucheng92 commented on code in PR #22179: URL: https://github.com/apache/flink/pull/22179#discussion_r1139991984
########## flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/SupportsShowLikeOperation.java: ########## @@ -0,0 +1,75 @@ +/* + * 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.flink.table.operations; + +import org.apache.flink.table.operations.utils.OperationLikeType; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** Abstract show operation supports filter with like. */ +public abstract class SupportsShowLikeOperation implements ShowOperation { + + // different like type such as like, ilike + private final OperationLikeType likeType; + private final boolean notLike; + private final String likePattern; + + /** Use when there is no sub-clause. */ + protected SupportsShowLikeOperation() { + this.likeType = null; + this.notLike = false; + this.likePattern = null; + } + + /** Use when there is like. */ + protected SupportsShowLikeOperation(String likeType, boolean notLike, String likePattern) { + if (likeType != null) { + this.likeType = OperationLikeType.of(likeType); + this.likePattern = checkNotNull(likePattern, "Like pattern must not be null"); + } else { + this.likeType = null; Review Comment: if a showOperations with from/in. such as ShowDatabases, it can only with from/in. then the likeType will be null. -- 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]
