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Bug#24786075 FIND A WAY TO LIST #SQL... TABLE LEFT IN DATA DICTIONARY IN CASE ALTER FAILS.
This patch adds a new keyword EXTENDED to SHOW TABLES syntax enabling users to list hidden tables that are created by ALTER TABLE command. In rare situations ALTER TABLE command might fail by leaving metadata of '#sql' temporary tables in DD table. The patch does following changes, - Change syntax of SHOW TABLES to add EXTENDED command. The new syntax would look like, SHOW [EXTENDED] [FULL] TABLES .... - Introduces new native function IS_VISIBLE_DD_OBJECT(). Which skips hidden tables, columns, indexes and index elements by default. And show them if EXTENDED keyword is provided in SHOW command. - Change CAN_ACCESS_TABLE()/CAN_ACCESS_COLUMN() native function to avoid handling hidden DD object checks. Move the responsibility to IS_VISIBLE_DD_OBJECT() native function. - Enable DROP TABLE command to drop temporary tables left by ALTER TABLE. - Add new test case to verify SHOW EXTENDED and the possibility of DROP TABLE to clean left-over temporary tables by ALTER TABLE.
1 parent 03bca7d commit 1e0d41f

37 files changed

+348
-125
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‎mysql-test/r/alter_sync.result

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@@ -46,6 +46,13 @@ COUNT(TABLE_NAME)
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SHOW TABLES FROM test_i_s;
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Tables_in_test_i_s
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t1
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# Check that there exists a hidden table created by ALTER and
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# I_S.TABLES had not listed above. The SHOW EXTENDED syntax was
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# added as part of Bug#24786075.
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SHOW EXTENDED TABLES FROM test_i_s;
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Tables_in_test_i_s
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#sql-xxxxx
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t1
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# Make sure mysqldump/mysqlpump ignores the #sql... tables.
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# mysqldump fails to acquire the lock without the fix.
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# Allow ALTER to continue.

‎mysql-test/r/alter_table-big.result

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@@ -90,3 +90,43 @@ set debug= "-d,mysql_lock_tables_kill_query";
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# The below disconnect should drop temporary table automagically.
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disconnect con1;
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connection default;
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#
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# Bug#24786075 FIND A WAY TO LIST #SQL... TABLE LEFT IN
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# DATA DICTIONARY IN CASE ALTER FAILS.
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# Test that we can see hidden temporary tables using ALTER TABLE.
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# Test that we can delete the hidden temporary tables that were
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# left by ALTER TABLE table failures in rare situations.
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#
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CREATE TABLE t1(a INT) ENGINE=MyISAM;
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SET debug="+d,exit_after_alter_table_before_rename";
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ALTER TABLE t1 modify column a varchar(30);
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ERROR HY000: Unknown error
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SET debug="-d,exit_after_alter_table_before_rename";
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# Verify that #sql... tables are not seen by I_S and SHOW
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SELECT COUNT(TABLE_NAME) FROM INFORMATION_SCHEMA.TABLES
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WHERE TABLE_SCHEMA='test' AND TABLE_NAME like '#sql%';
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COUNT(TABLE_NAME)
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0
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SHOW TABLES FROM test;
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Tables_in_test
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t1
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# The SHOW EXTENDED [FULL] syntax should show the hidden table.
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SHOW EXTENDED TABLES FROM test;
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Tables_in_test
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#sql-xxxxx
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t1
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SHOW EXTENDED FULL TABLES FROM test;
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Tables_in_test Table_type
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#sql-xxxxx BASE TABLE
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t1 BASE TABLE
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# Dropping the temporary table.
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DROP TABLE `#sql-xxxxx;
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# Verify that the temporary table is dropped.
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SHOW EXTENDED TABLES FROM test;
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Tables_in_test
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t1
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SHOW EXTENDED FULL TABLES FROM test;
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Tables_in_test Table_type
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t1 BASE TABLE
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# clean-up
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DROP TABLE t1;

‎mysql-test/r/dd_is_compatibility_ci.result

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Original file line numberDiff line numberDiff line change
@@ -66,7 +66,7 @@ tables_priv
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# I_S view definitions.
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SHOW CREATE TABLE information_schema.tables;
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View Create View character_set_client collation_connection
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TABLES CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`TABLES` AS select (`cat`.`name` collate utf8_tolower_ci) AS `TABLE_CATALOG`,(`sch`.`name` collate utf8_tolower_ci) AS `TABLE_SCHEMA`,(`tbl`.`name` collate utf8_tolower_ci) AS `TABLE_NAME`,`tbl`.`type` AS `TABLE_TYPE`,if((`tbl`.`type` = 'BASE TABLE'),`tbl`.`engine`,NULL) AS `ENGINE`,if((`tbl`.`type` = 'VIEW'),NULL,10) AS `VERSION`,`tbl`.`row_format` AS `ROW_FORMAT`,`stat`.`table_rows` AS `TABLE_ROWS`,`stat`.`avg_row_length` AS `AVG_ROW_LENGTH`,`stat`.`data_length` AS `DATA_LENGTH`,`stat`.`max_data_length` AS `MAX_DATA_LENGTH`,`stat`.`index_length` AS `INDEX_LENGTH`,`stat`.`data_free` AS `DATA_FREE`,`stat`.`auto_increment` AS `AUTO_INCREMENT`,`tbl`.`created` AS `CREATE_TIME`,`stat`.`update_time` AS `UPDATE_TIME`,`stat`.`check_time` AS `CHECK_TIME`,`col`.`name` AS `TABLE_COLLATION`,`stat`.`checksum` AS `CHECKSUM`,if((`tbl`.`type` = 'VIEW'),NULL,get_dd_create_options(`tbl`.`options`,if((ifnull(`tbl`.`partition_expression`,'NOT_PART_TBL') = 'NOT_PART_TBL'),0,1))) AS `CREATE_OPTIONS`,internal_get_comment_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`,`tbl`.`comment`) AS `TABLE_COMMENT` from ((((`mysql`.`tables` `tbl` join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) left join `mysql`.`collations` `col` on((`tbl`.`collation_id` = `col`.`id`))) left join `mysql`.`table_stats` `stat` on(((`tbl`.`name` = `stat`.`table_name`) and (`sch`.`name` = `stat`.`schema_name`)))) where (can_access_table(`sch`.`name`,`tbl`.`name`,FALSE) and (`tbl`.`hidden` = 'Visible')) utf8 utf8_general_ci
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TABLES CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`TABLES` AS select (`cat`.`name` collate utf8_tolower_ci) AS `TABLE_CATALOG`,(`sch`.`name` collate utf8_tolower_ci) AS `TABLE_SCHEMA`,(`tbl`.`name` collate utf8_tolower_ci) AS `TABLE_NAME`,`tbl`.`type` AS `TABLE_TYPE`,if((`tbl`.`type` = 'BASE TABLE'),`tbl`.`engine`,NULL) AS `ENGINE`,if((`tbl`.`type` = 'VIEW'),NULL,10) AS `VERSION`,`tbl`.`row_format` AS `ROW_FORMAT`,`stat`.`table_rows` AS `TABLE_ROWS`,`stat`.`avg_row_length` AS `AVG_ROW_LENGTH`,`stat`.`data_length` AS `DATA_LENGTH`,`stat`.`max_data_length` AS `MAX_DATA_LENGTH`,`stat`.`index_length` AS `INDEX_LENGTH`,`stat`.`data_free` AS `DATA_FREE`,`stat`.`auto_increment` AS `AUTO_INCREMENT`,`tbl`.`created` AS `CREATE_TIME`,`stat`.`update_time` AS `UPDATE_TIME`,`stat`.`check_time` AS `CHECK_TIME`,`col`.`name` AS `TABLE_COLLATION`,`stat`.`checksum` AS `CHECKSUM`,if((`tbl`.`type` = 'VIEW'),NULL,get_dd_create_options(`tbl`.`options`,if((ifnull(`tbl`.`partition_expression`,'NOT_PART_TBL') = 'NOT_PART_TBL'),0,1))) AS `CREATE_OPTIONS`,internal_get_comment_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`,`tbl`.`comment`) AS `TABLE_COMMENT` from ((((`mysql`.`tables` `tbl` join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) left join `mysql`.`collations` `col` on((`tbl`.`collation_id` = `col`.`id`))) left join `mysql`.`table_stats` `stat` on(((`tbl`.`name` = `stat`.`table_name`) and (`sch`.`name` = `stat`.`schema_name`)))) where (can_access_table(`sch`.`name`,`tbl`.`name`) and is_visible_dd_object(`tbl`.`hidden`)) utf8 utf8_general_ci
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#########################################################
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# Issue WL#6599/HLS/6c): Capital cased I_S table column names.
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#########################################################

‎mysql-test/r/dd_is_compatibility_cs.result

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@@ -66,7 +66,7 @@ tables_priv
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# I_S view definitions.
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SHOW CREATE TABLE information_schema.tables;
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View Create View character_set_client collation_connection
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TABLES CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`TABLES` AS select `cat`.`name` AS `TABLE_CATALOG`,`sch`.`name` AS `TABLE_SCHEMA`,`tbl`.`name` AS `TABLE_NAME`,`tbl`.`type` AS `TABLE_TYPE`,if((`tbl`.`type` = 'BASE TABLE'),`tbl`.`engine`,NULL) AS `ENGINE`,if((`tbl`.`type` = 'VIEW'),NULL,10) AS `VERSION`,`tbl`.`row_format` AS `ROW_FORMAT`,`stat`.`table_rows` AS `TABLE_ROWS`,`stat`.`avg_row_length` AS `AVG_ROW_LENGTH`,`stat`.`data_length` AS `DATA_LENGTH`,`stat`.`max_data_length` AS `MAX_DATA_LENGTH`,`stat`.`index_length` AS `INDEX_LENGTH`,`stat`.`data_free` AS `DATA_FREE`,`stat`.`auto_increment` AS `AUTO_INCREMENT`,`tbl`.`created` AS `CREATE_TIME`,`stat`.`update_time` AS `UPDATE_TIME`,`stat`.`check_time` AS `CHECK_TIME`,`col`.`name` AS `TABLE_COLLATION`,`stat`.`checksum` AS `CHECKSUM`,if((`tbl`.`type` = 'VIEW'),NULL,get_dd_create_options(`tbl`.`options`,if((ifnull(`tbl`.`partition_expression`,'NOT_PART_TBL') = 'NOT_PART_TBL'),0,1))) AS `CREATE_OPTIONS`,internal_get_comment_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`,`tbl`.`comment`) AS `TABLE_COMMENT` from ((((`mysql`.`tables` `tbl` join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) left join `mysql`.`collations` `col` on((`tbl`.`collation_id` = `col`.`id`))) left join `mysql`.`table_stats` `stat` on(((`tbl`.`name` = `stat`.`table_name`) and (`sch`.`name` = `stat`.`schema_name`)))) where (can_access_table(`sch`.`name`,`tbl`.`name`,FALSE) and (`tbl`.`hidden` = 'Visible')) utf8 utf8_general_ci
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TABLES CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`TABLES` AS select `cat`.`name` AS `TABLE_CATALOG`,`sch`.`name` AS `TABLE_SCHEMA`,`tbl`.`name` AS `TABLE_NAME`,`tbl`.`type` AS `TABLE_TYPE`,if((`tbl`.`type` = 'BASE TABLE'),`tbl`.`engine`,NULL) AS `ENGINE`,if((`tbl`.`type` = 'VIEW'),NULL,10) AS `VERSION`,`tbl`.`row_format` AS `ROW_FORMAT`,`stat`.`table_rows` AS `TABLE_ROWS`,`stat`.`avg_row_length` AS `AVG_ROW_LENGTH`,`stat`.`data_length` AS `DATA_LENGTH`,`stat`.`max_data_length` AS `MAX_DATA_LENGTH`,`stat`.`index_length` AS `INDEX_LENGTH`,`stat`.`data_free` AS `DATA_FREE`,`stat`.`auto_increment` AS `AUTO_INCREMENT`,`tbl`.`created` AS `CREATE_TIME`,`stat`.`update_time` AS `UPDATE_TIME`,`stat`.`check_time` AS `CHECK_TIME`,`col`.`name` AS `TABLE_COLLATION`,`stat`.`checksum` AS `CHECKSUM`,if((`tbl`.`type` = 'VIEW'),NULL,get_dd_create_options(`tbl`.`options`,if((ifnull(`tbl`.`partition_expression`,'NOT_PART_TBL') = 'NOT_PART_TBL'),0,1))) AS `CREATE_OPTIONS`,internal_get_comment_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`,`tbl`.`comment`) AS `TABLE_COMMENT` from ((((`mysql`.`tables` `tbl` join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) left join `mysql`.`collations` `col` on((`tbl`.`collation_id` = `col`.`id`))) left join `mysql`.`table_stats` `stat` on(((`tbl`.`name` = `stat`.`table_name`) and (`sch`.`name` = `stat`.`schema_name`)))) where (can_access_table(`sch`.`name`,`tbl`.`name`) and is_visible_dd_object(`tbl`.`hidden`)) utf8 utf8_general_ci
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#########################################################
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# Issue WL#6599/HLS/6c): Capital cased I_S table column names.
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#########################################################

‎mysql-test/suite/funcs_1/r/is_columns.result

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@@ -51,7 +51,7 @@ COLUMN_COMMENT text NO NULL
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GENERATION_EXPRESSION longtext NO NULL
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SHOW CREATE TABLE information_schema.COLUMNS;
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View Create View character_set_client collation_connection
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COLUMNS CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`COLUMNS` AS select `cat`.`name` AS `TABLE_CATALOG`,`sch`.`name` AS `TABLE_SCHEMA`,`tbl`.`name` AS `TABLE_NAME`,(`col`.`name` collate utf8_tolower_ci) AS `COLUMN_NAME`,`col`.`ordinal_position` AS `ORDINAL_POSITION`,`col`.`default_value_utf8` AS `COLUMN_DEFAULT`,if((`col`.`is_nullable` = 1),'YES','NO') AS `IS_NULLABLE`,substring_index(substring_index(`col`.`column_type_utf8`,'(',1),' ',1) AS `DATA_TYPE`,internal_dd_char_length(`col`.`type`,`col`.`char_length`,`coll`.`name`,0) AS `CHARACTER_MAXIMUM_LENGTH`,internal_dd_char_length(`col`.`type`,`col`.`char_length`,`coll`.`name`,1) AS `CHARACTER_OCTET_LENGTH`,if((`col`.`numeric_precision` = 0),NULL,`col`.`numeric_precision`) AS `NUMERIC_PRECISION`,if(((`col`.`numeric_scale` = 0) and (`col`.`numeric_precision` = 0)),NULL,`col`.`numeric_scale`) AS `NUMERIC_SCALE`,`col`.`datetime_precision` AS `DATETIME_PRECISION`,(case `col`.`type` when 'MYSQL_TYPE_STRING' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_VAR_STRING' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_VARCHAR' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_TINY_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_MEDIUM_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_LONG_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_ENUM' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_SET' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) else NULL end) AS `CHARACTER_SET_NAME`,(case `col`.`type` when 'MYSQL_TYPE_STRING' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_VAR_STRING' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_VARCHAR' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_TINY_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_MEDIUM_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_LONG_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_ENUM' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_SET' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) else NULL end) AS `COLLATION_NAME`,`col`.`column_type_utf8` AS `COLUMN_TYPE`,`col`.`column_key` AS `COLUMN_KEY`,if((ifnull(`col`.`generation_expression_utf8`,'IS_NOT_GC') = 'IS_NOT_GC'),if((`col`.`is_auto_increment` = TRUE),concat(ifnull(concat('on update ',`col`.`update_option`,' '),''),'auto_increment'),ifnull(concat('on update ',`col`.`update_option`),'')),if(`col`.`is_virtual`,'VIRTUAL GENERATED','STORED GENERATED')) AS `EXTRA`,get_dd_column_privileges(`sch`.`name`,`tbl`.`name`,`col`.`name`) AS `PRIVILEGES`,ifnull(`col`.`comment`,'') AS `COLUMN_COMMENT`,ifnull(`col`.`generation_expression_utf8`,'') AS `GENERATION_EXPRESSION` from (((((`mysql`.`columns` `col` join `mysql`.`tables` `tbl` on((`col`.`table_id` = `tbl`.`id`))) join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) join `mysql`.`collations` `coll` on((`col`.`collation_id` = `coll`.`id`))) join `mysql`.`character_sets` `cs` on((`coll`.`character_set_id` = `cs`.`id`))) where (internal_get_view_warning_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`) and can_access_column(`sch`.`name`,`tbl`.`name`,`col`.`name`,`col`.`hidden`) and (`tbl`.`hidden` = 'Visible')) utf8 utf8_general_ci
54+
COLUMNS CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `information_schema`.`COLUMNS` AS select `cat`.`name` AS `TABLE_CATALOG`,`sch`.`name` AS `TABLE_SCHEMA`,`tbl`.`name` AS `TABLE_NAME`,(`col`.`name` collate utf8_tolower_ci) AS `COLUMN_NAME`,`col`.`ordinal_position` AS `ORDINAL_POSITION`,`col`.`default_value_utf8` AS `COLUMN_DEFAULT`,if((`col`.`is_nullable` = 1),'YES','NO') AS `IS_NULLABLE`,substring_index(substring_index(`col`.`column_type_utf8`,'(',1),' ',1) AS `DATA_TYPE`,internal_dd_char_length(`col`.`type`,`col`.`char_length`,`coll`.`name`,0) AS `CHARACTER_MAXIMUM_LENGTH`,internal_dd_char_length(`col`.`type`,`col`.`char_length`,`coll`.`name`,1) AS `CHARACTER_OCTET_LENGTH`,if((`col`.`numeric_precision` = 0),NULL,`col`.`numeric_precision`) AS `NUMERIC_PRECISION`,if(((`col`.`numeric_scale` = 0) and (`col`.`numeric_precision` = 0)),NULL,`col`.`numeric_scale`) AS `NUMERIC_SCALE`,`col`.`datetime_precision` AS `DATETIME_PRECISION`,(case `col`.`type` when 'MYSQL_TYPE_STRING' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_VAR_STRING' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_VARCHAR' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_TINY_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_MEDIUM_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_LONG_BLOB' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_ENUM' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) when 'MYSQL_TYPE_SET' then if((`cs`.`name` = 'binary'),NULL,`cs`.`name`) else NULL end) AS `CHARACTER_SET_NAME`,(case `col`.`type` when 'MYSQL_TYPE_STRING' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_VAR_STRING' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_VARCHAR' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_TINY_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_MEDIUM_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_LONG_BLOB' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_ENUM' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) when 'MYSQL_TYPE_SET' then if((`cs`.`name` = 'binary'),NULL,`coll`.`name`) else NULL end) AS `COLLATION_NAME`,`col`.`column_type_utf8` AS `COLUMN_TYPE`,`col`.`column_key` AS `COLUMN_KEY`,if((ifnull(`col`.`generation_expression_utf8`,'IS_NOT_GC') = 'IS_NOT_GC'),if((`col`.`is_auto_increment` = TRUE),concat(ifnull(concat('on update ',`col`.`update_option`,' '),''),'auto_increment'),ifnull(concat('on update ',`col`.`update_option`),'')),if(`col`.`is_virtual`,'VIRTUAL GENERATED','STORED GENERATED')) AS `EXTRA`,get_dd_column_privileges(`sch`.`name`,`tbl`.`name`,`col`.`name`) AS `PRIVILEGES`,ifnull(`col`.`comment`,'') AS `COLUMN_COMMENT`,ifnull(`col`.`generation_expression_utf8`,'') AS `GENERATION_EXPRESSION` from (((((`mysql`.`columns` `col` join `mysql`.`tables` `tbl` on((`col`.`table_id` = `tbl`.`id`))) join `mysql`.`schemata` `sch` on((`tbl`.`schema_id` = `sch`.`id`))) join `mysql`.`catalogs` `cat` on((`cat`.`id` = `sch`.`catalog_id`))) join `mysql`.`collations` `coll` on((`col`.`collation_id` = `coll`.`id`))) join `mysql`.`character_sets` `cs` on((`coll`.`character_set_id` = `cs`.`id`))) where (internal_get_view_warning_or_error(`sch`.`name`,`tbl`.`name`,`tbl`.`type`,`tbl`.`options`) and can_access_column(`sch`.`name`,`tbl`.`name`,`col`.`name`) and is_visible_dd_object(`tbl`.`hidden`,`col`.`hidden`)) utf8 utf8_general_ci
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SHOW COLUMNS FROM information_schema.COLUMNS;
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Field Type Null Key Default Extra
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TABLE_CATALOG varchar(64) NO NULL

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