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# # Bug 35333 "If a Federated table can't connect to the remote hose, can't retrieve metadata" # # Queries such as SHOW TABLE STATUS and SELECT * FROM INFORMATION_SCHEMA.TABLES fail # when encountering a federated table that cannot connect to its remote table. # # The fix is to store the error text in the TABLE COMMENTS column of I_S.TABLES, clear # the remote connection error and push a warning instead. This allows the SELECT operation # to complete while still indicating a problem. This fix applies to any non-fatal system # error that occurs during a query against I_S.TABLES.de CREATE DATABASE federated; CREATE DATABASE federated; CREATE DATABASE IF NOT EXISTS realdb; DROP TABLE IF EXISTS realdb.t0; DROP TABLE IF EXISTS federated.t0; # # Create the base table to be referenced # CREATE TABLE realdb.t0 (a text, b text) ENGINE=MYISAM; # # Create a federated table with a bogus port number # CREATE TABLE federated.t0 (a text, b text) ENGINE=FEDERATED CONNECTION='mysql://[email protected]:63333/realdb/t0'; # # Trigger a federated system error during a INFORMATION_SCHEMA.TABLES query # SELECT TABLE_SCHEMA, TABLE_NAME, TABLE_TYPE, ENGINE, ROW_FORMAT, TABLE_ROWS, DATA_LENGTH, TABLE_COMMENT FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'realdb' or TABLE_SCHEMA = 'federated'; TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE ROW_FORMAT TABLE_ROWS DATA_LENGTH TABLE_COMMENT federated t0 BASE TABLE FEDERATED NULL 0 Unable to connect to foreign data source: Can't connect to MySQL server on '127.0.0.1' (socket errno) realdb t0 BASE TABLE MyISAM Dynamic 0 0 Warnings: Warning 1429 Unable to connect to foreign data source: Can't connect to MySQL server on '127.0.0.1' (socket errno) SHOW WARNINGS; Level Code Message Warning 1429 Unable to connect to foreign data source: Can't connect to MySQL server on '127.0.0.1' (socket errno) # # Create a MyISAM table then corrupt the file # USE realdb; CREATE TABLE t1 (c1 int) ENGINE=MYISAM; # # Corrupt the MyISAM table by deleting the base file # # # Trigger a MyISAM system error during an INFORMATION_SCHEMA.TABLES query # SELECT TABLE_SCHEMA, TABLE_NAME, TABLE_TYPE, ENGINE, ROW_FORMAT, TABLE_ROWS, DATA_LENGTH, TABLE_COMMENT FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 't1'; TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE ROW_FORMAT TABLE_ROWS DATA_LENGTH TABLE_COMMENT realdb t1 BASE TABLE NULL NULL NULL NULL Can't find file: 't1' (errno: 2 - No such file or directory) Warnings: Warning 1017 Can't find file: 't1' (errno: 2 - No such file or directory) SHOW WARNINGS; Level Code Message Warning 1017 Can't find file: 't1' (errno: 2 - No such file or directory) # # Cleanup # DROP TABLE IF EXISTS realdb.t0; DROP TABLE IF EXISTS federated.t0; DROP DATABASE realdb; DROP TABLE IF EXISTS federated.t1; DROP DATABASE federated; DROP TABLE IF EXISTS federated.t1; DROP DATABASE federated;