smiklosovic commented on code in PR #4411: URL: https://github.com/apache/cassandra/pull/4411#discussion_r2436477253
########## src/java/org/apache/cassandra/db/virtual/SchemaCommentsTable.java: ########## @@ -0,0 +1,86 @@ +/* + * 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.cassandra.db.virtual; + +import org.apache.cassandra.schema.ColumnMetadata; +import org.apache.cassandra.schema.KeyspaceMetadata; +import org.apache.cassandra.schema.TableMetadata; +import org.apache.cassandra.db.marshal.UserType; + +/** + * Virtual table that exposes all comments on schema elements. + * <p> + * This table provides a unified view of documentation metadata across: + * <ul> + * <li>Keyspaces - comments on keyspaces</li> + * <li>Tables - comments on tables</li> + * <li>Columns - comments on columns</li> + * <li>User-Defined Types (UDTs) - comments on UDTs</li> + * </ul> + * </p> + * <p> + * The table automatically reflects the current state of schema metadata without requiring + * explicit updates. Data is read directly from {@link org.apache.cassandra.schema.Schema#instance} on each query. + * </p> + * <p> + * Example queries: + * <pre> + * -- All comments in the system + * SELECT * FROM system_views.schema_comments; + * + * -- All table comments in a specific keyspace + * SELECT * FROM system_views.schema_comments + * WHERE object_type = 'TABLE' AND keyspace_name = 'my_keyspace'; + * + * -- All column comments across all keyspaces + * SELECT * FROM system_views.schema_comments WHERE object_type = 'COLUMN'; + * </pre> + * </p> + */ +final class SchemaCommentsTable extends AbstractSchemaMetadataTable +{ + SchemaCommentsTable(String keyspace) + { + super(keyspace, SchemaTableType.COMMENT); + } + Review Comment: remove one empty line here please -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
