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After this change, the new SHOW METADATA TABLES IN statement can be used to list all the available metadata tables of an Iceberg table. Note that in contrast to querying the contents of Iceberg metadata tables, this does not require fully qualified paths, e.g. both SHOW METADATA TABLES IN functional_parquet.iceberg_query_metadata; and USE functional_parquet; SHOW METADATA TABLES IN iceberg_query_metadata; work. The available metadata tables for all Iceberg tables are the same, corresponding to the values of the enum "org.apache.iceberg.MetadataTableType", so there is actually no need to pass the name of the regular table for which the metadata table list is requested through Thrift. This change, however, does send the table name because this way - if we add support for metadata tables for other table formats, the table name/path will be necessary to determine the correct list of metadata tables - we could later add support for different authorisation policies for individual tables - we can check also at the point of generating the list of metadata tables that the table is an Iceberg table Testing: - added and updated tests in ParserTest, AnalyzeDDLTest, ToSqlTest and AuthorizationStmtTest - added a custom cluster test in test_authorization.py - added functional tests in iceberg-metadata-tables.test Change-Id: Ide10ccf10fc0abf5c270119ba7092c67e712ec49 Reviewed-on: http://gerrit.cloudera.org:8080/21026 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Zoltan Borok-Nagy <boroknagyz@cloudera.com>