DROP TABLE IF EXISTS 02155_test_table; CREATE TABLE 02155_test_table ( id UInt64, value String ) ENGINE=TinyLog; INSERT INTO 02155_test_table VALUES (0, 'Value'); DROP DICTIONARY IF EXISTS 02155_test_dictionary; CREATE DICTIONARY 02155_test_dictionary ( id UInt64, value String ) PRIMARY KEY id SOURCE(CLICKHOUSE(TABLE '02155_test_table')) LAYOUT(DIRECT()); SELECT name, comment FROM system.dictionaries WHERE name == '02155_test_dictionary' AND database == currentDatabase(); ALTER TABLE 02155_test_dictionary COMMENT COLUMN value 'value_column'; --{serverError 48} ALTER TABLE 02155_test_dictionary MODIFY COMMENT '02155_test_dictionary_comment_0'; SELECT name, comment FROM system.dictionaries WHERE name == '02155_test_dictionary' AND database == currentDatabase(); SELECT name, comment FROM system.tables WHERE name == '02155_test_dictionary' AND database == currentDatabase(); SELECT * FROM 02155_test_dictionary; SELECT name, comment FROM system.dictionaries WHERE name == '02155_test_dictionary' AND database == currentDatabase(); SELECT name, comment FROM system.tables WHERE name == '02155_test_dictionary' AND database == currentDatabase(); ALTER TABLE 02155_test_dictionary MODIFY COMMENT '02155_test_dictionary_comment_1'; SELECT name, comment FROM system.dictionaries WHERE name == '02155_test_dictionary' AND database == currentDatabase(); SELECT name, comment FROM system.tables WHERE name == '02155_test_dictionary' AND database == currentDatabase(); DROP TABLE IF EXISTS 02155_test_dictionary_view; CREATE TABLE 02155_test_dictionary_view ( id UInt64, value String ) ENGINE=Dictionary(concat(currentDatabase(), '.02155_test_dictionary')); SELECT * FROM 02155_test_dictionary_view; ALTER TABLE 02155_test_dictionary_view COMMENT COLUMN value 'value_column'; --{serverError 48} ALTER TABLE 02155_test_dictionary_view MODIFY COMMENT '02155_test_dictionary_view_comment_0'; SELECT name, comment FROM system.tables WHERE name == '02155_test_dictionary_view' AND database == currentDatabase(); SELECT name, comment FROM system.tables WHERE name == '02155_test_dictionary_view' AND database == currentDatabase(); DROP TABLE 02155_test_dictionary_view; DROP TABLE 02155_test_table; DROP DICTIONARY 02155_test_dictionary;