MDEV-25325 built-in documentation for performance_schema tables

Improve documentation of performance_schema tables by appending COLUMN
comments to tables. Additionally improve test coverage and update corresponding
tests.

mysql-test/suite/perfschema/t/dml_accounts.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.accounts WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='accounts';

mysql-test/suite/perfschema/t/dml_cond_instances.test

@@ -33,3 +33,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.cond_instances WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='cond_instances';

mysql-test/suite/perfschema/t/dml_esgs_by_account_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_account_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_by_account_by_event_name';

mysql-test/suite/perfschema/t/dml_esgs_by_host_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_host_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_by_host_by_event_name';

mysql-test/suite/perfschema/t/dml_esgs_by_thread_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_thread_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_by_thread_by_event_name';

mysql-test/suite/perfschema/t/dml_esgs_by_user_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_user_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_by_user_by_event_name';

mysql-test/suite/perfschema/t/dml_esgs_global_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_global_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_global_by_event_name';

mysql-test/suite/perfschema/t/dml_esms_by_account_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_account_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_account_by_event_name';

mysql-test/suite/perfschema/t/dml_esms_by_digest.test

@@ -61,3 +61,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_digest WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_digest';

mysql-test/suite/perfschema/t/dml_esms_by_host_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_host_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_host_by_event_name';

mysql-test/suite/perfschema/t/dml_esms_by_thread_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_thread_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_thread_by_event_name';

mysql-test/suite/perfschema/t/dml_esms_by_user_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_user_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_user_by_event_name';

mysql-test/suite/perfschema/t/dml_esms_global_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_global_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_global_by_event_name';

mysql-test/suite/perfschema/t/dml_events_stages_current.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_current WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_current';

mysql-test/suite/perfschema/t/dml_events_stages_history.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_history WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_history';

mysql-test/suite/perfschema/t/dml_events_stages_history_long.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_history_long WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_history_long';

mysql-test/suite/perfschema/t/dml_events_statements_current.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_current WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_current';

mysql-test/suite/perfschema/t/dml_events_statements_history.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_history WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_history';

mysql-test/suite/perfschema/t/dml_events_statements_history_long.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_history_long WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_history_long';

mysql-test/suite/perfschema/t/dml_events_waits_current.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_current WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_current';

mysql-test/suite/perfschema/t/dml_events_waits_history.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_history WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_history';

mysql-test/suite/perfschema/t/dml_events_waits_history_long.test

@@ -45,3 +45,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_history_long WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_history_long';

mysql-test/suite/perfschema/t/dml_ews_by_account_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_account_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_account_by_event_name';

mysql-test/suite/perfschema/t/dml_ews_by_host_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_host_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_host_by_event_name';

mysql-test/suite/perfschema/t/dml_ews_by_instance.test

@@ -52,3 +52,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_instance WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_instance';

mysql-test/suite/perfschema/t/dml_ews_by_thread_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_thread_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_thread_by_event_name';

mysql-test/suite/perfschema/t/dml_ews_by_user_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_user_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_user_by_event_name';

mysql-test/suite/perfschema/t/dml_ews_global_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_global_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_global_by_event_name';

mysql-test/suite/perfschema/t/dml_file_instances.test

@@ -33,3 +33,11 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_instances WRITE;
 UNLOCK TABLES;
 
+
+
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_instances';

mysql-test/suite/perfschema/t/dml_fs_by_event_name.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_summary_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_summary_by_event_name';

mysql-test/suite/perfschema/t/dml_fs_by_instance.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_summary_by_instance WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_summary_by_instance';

mysql-test/suite/perfschema/t/dml_host_cache.test

@@ -41,3 +41,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.host_cache WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='host_cache';

mysql-test/suite/perfschema/t/dml_hosts.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.hosts WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='hosts';

mysql-test/suite/perfschema/t/dml_mutex_instances.test

@@ -33,3 +33,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.mutex_instances WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='mutex_instances';

mysql-test/suite/perfschema/t/dml_os_global_by_type.test

@@ -55,3 +55,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.objects_summary_global_by_type WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='objects_summary_global_by_type';

mysql-test/suite/perfschema/t/dml_performance_timers.test

@@ -35,3 +35,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.performance_timers WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='performance_timers';

mysql-test/suite/perfschema/t/dml_rwlock_instances.test

@@ -33,3 +33,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.rwlock_instances WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='rwlock_instances';

mysql-test/suite/perfschema/t/dml_session_account_connect_attrs.test

@@ -1,3 +1,5 @@
+# Tests for PERFORMANCE_SCHEMA
+
 --source include/not_embedded.inc
 --source include/have_perfschema.inc
 
@@ -36,3 +38,10 @@ UNLOCK TABLES;
 -- error ER_TABLEACCESS_DENIED_ERROR
 LOCK TABLES performance_schema.session_account_connect_attrs WRITE;
 UNLOCK TABLES;
+
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='session_account_connect_attrs';

mysql-test/suite/perfschema/t/dml_session_connect_attrs.test

@@ -1,3 +1,5 @@
+# Tests for PERFORMANCE_SCHEMA
+
 --source include/not_embedded.inc
 --source include/have_perfschema.inc
 
@@ -36,3 +38,10 @@ UNLOCK TABLES;
 -- error ER_TABLEACCESS_DENIED_ERROR
 LOCK TABLES performance_schema.session_connect_attrs WRITE;
 UNLOCK TABLES;
+
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='session_connect_attrs';

mysql-test/suite/perfschema/t/dml_setup_actors.test

@@ -70,3 +70,9 @@ insert into performance_schema.setup_actors
   select * from test.setup_actors;
 drop table test.setup_actors;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_actors';

mysql-test/suite/perfschema/t/dml_setup_consumers.test

@@ -38,3 +38,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.setup_consumers WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_consumers';

mysql-test/suite/perfschema/t/dml_setup_instruments.test

@@ -98,3 +98,10 @@ ORDER BY RAND();
 update performance_schema.setup_instruments set timed='YES';
 --enable_query_log
 
+
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_instruments';

mysql-test/suite/perfschema/t/dml_setup_objects.test

@@ -94,3 +94,9 @@ insert into performance_schema.setup_objects
   select * from test.setup_objects;
 drop table test.setup_objects;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_objects';

mysql-test/suite/perfschema/t/dml_setup_timers.test

@@ -64,3 +64,9 @@ update performance_schema.setup_timers
 
 select * from performance_schema.setup_timers;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_timers';

mysql-test/suite/perfschema/t/dml_socket_instances.test

@@ -33,3 +33,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_instances WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_instances';

mysql-test/suite/perfschema/t/dml_socket_summary_by_event_name.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_summary_by_event_name WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_summary_by_event_name';

mysql-test/suite/perfschema/t/dml_socket_summary_by_instance.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_summary_by_instance WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_summary_by_instance';

mysql-test/suite/perfschema/t/dml_threads.test

@@ -48,3 +48,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.threads WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='threads';

mysql-test/suite/perfschema/t/dml_tiws_by_index_usage.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_io_waits_summary_by_index_usage WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_io_waits_summary_by_index_usage';

mysql-test/suite/perfschema/t/dml_tiws_by_table.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_io_waits_summary_by_table WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_io_waits_summary_by_table';

mysql-test/suite/perfschema/t/dml_tlws_by_table.test

@@ -40,3 +40,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_lock_waits_summary_by_table WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_lock_waits_summary_by_table';

mysql-test/suite/perfschema/t/dml_users.test

@@ -39,3 +39,9 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.users WRITE;
 UNLOCK TABLES;
 
+--echo #
+--echo # MDEV-25325 column_comment for performance_schema tables
+--echo #
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='users';

mysql-test/suite/perfschema/t/table_schema.test

@@ -55,3 +55,8 @@ select count(*) from information_schema.columns
 
 select (@count_object_columns - @count_object_unsigned) = 0;
 
+# Confirm that all columns have comments
+#
+select count(*) from information_schema.columns
+   where table_schema="performance_schema"
+   and (column_comment is null or column_comment = '');