snuyanzin commented on code in PR #25200: URL: https://github.com/apache/flink/pull/25200#discussion_r1721681790
########## flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/operations/converters/AbstractSqlShowConverter.java: ########## @@ -0,0 +1,73 @@ +/* + * 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.planner.operations.converters; + +import org.apache.flink.sql.parser.dql.SqlShowCall; +import org.apache.flink.table.api.ValidationException; +import org.apache.flink.table.catalog.CatalogManager; +import org.apache.flink.table.operations.Operation; +import org.apache.flink.table.operations.utils.LikeType; +import org.apache.flink.table.operations.utils.ShowLikeOperator; + +import java.util.List; +import java.util.function.Function; + +public abstract class AbstractSqlShowConverter<T extends SqlShowCall> + implements SqlNodeConverter<T> { + + protected Operation convertShowOperation( + T sqlShowCall, Function<List<String>, String> msg, ConvertContext context) { + final ShowLikeOperator likeOp = getLikeOp(sqlShowCall); + if (sqlShowCall.getPreposition() == null) { + return getOperationWithoutPrep(sqlShowCall, likeOp); + } + List<String> fullDatabaseName = sqlShowCall.getSqlIdentifierNameList(); + if (fullDatabaseName.size() > 2) { + throw new ValidationException(msg.apply(fullDatabaseName)); + } + CatalogManager catalogManager = context.getCatalogManager(); + String catalogName = + fullDatabaseName.size() == 1 + ? catalogManager.getCurrentCatalog() Review Comment: yep, depending on case catalog name and database name could be `null`, marked `@Nullable` in `getOperation` example of such case ```sql SHOW TABLES ``` here neither catalog nor database is specified and both will be `null`, then in `Operation` there will be `getCurrentCatalog()`/`getCurrentDatabase()` used -- 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: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
