rdblue commented on a change in pull request #1870: URL: https://github.com/apache/iceberg/pull/1870#discussion_r539512479
########## File path: core/src/main/java/org/apache/iceberg/hadoop/JdbcTableDao.java ########## @@ -0,0 +1,128 @@ +/* + * 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.iceberg.hadoop; + +import java.sql.SQLException; +import java.util.List; +import org.apache.commons.dbutils.QueryRunner; +import org.apache.commons.dbutils.handlers.BeanHandler; +import org.apache.commons.dbutils.handlers.BeanListHandler; +import org.apache.iceberg.catalog.Namespace; +import org.apache.iceberg.catalog.TableIdentifier; +import org.apache.iceberg.exceptions.NoSuchTableException; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +public class JdbcTableDao { + public static final String TABLES_TABLE_NAME = "iceberg_tables"; + public static final String JDBC_CATALOG_TABLE_DDL = + "CREATE TABLE IF NOT EXISTS " + JdbcTableDao.TABLES_TABLE_NAME + + "(catalogName VARCHAR(1255) NOT NULL," + + "tableNamespace VARCHAR(1255) NOT NULL," + + "tableName VARCHAR(1255) NOT NULL," + + "metadataLocation VARCHAR(32768)," + + "previousMetadataLocation VARCHAR(32768)," + + "PRIMARY KEY (catalogName,tableNamespace,tableName)," + + "FOREIGN KEY (catalogName, tableNamespace) REFERENCES " + JdbcNamespaceDao.NAMESPACES_TABLE_NAME + Review comment: I think the problem is that we need that primary key to ensure that there is only one entry for a given table identifier. We don't want two concurrent creates to collide and create two different tables. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
