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/r/dml_accounts.result

@@ -23,3 +23,14 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.accounts WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'accounts'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='accounts';
+column_name	column_comment
+USER	The connection's client user name for the connection, or NULL if an internal thread.
+HOST	The connection client's host name, or NULL if an internal thread.
+CURRENT_CONNECTIONS	Current connections for the account.
+TOTAL_CONNECTIONS	Total connections for the account.

mysql-test/suite/perfschema/r/dml_cond_instances.result

@@ -18,3 +18,12 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.cond_instances WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'cond_instances'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='cond_instances';
+column_name	column_comment
+NAME	Client user name for the connection, or NULL if an internal thread.
+OBJECT_INSTANCE_BEGIN	Address in memory of the instrumented condition.

mysql-test/suite/perfschema/r/dml_esgs_by_account_by_event_name.result

@@ -24,3 +24,18 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_account_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_summary_by_account_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with HOST and EVENT_NAME for grouping events.
+HOST	Host. Used together with USER and EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER and HOST for grouping events.
+COUNT_STAR	Number of summarized events, which includes all timed and untimed events.
+SUM_TIMER_WAIT	Total wait time of the timed summarized events.
+MIN_TIMER_WAIT	Minimum wait time of the timed summarized events.
+AVG_TIMER_WAIT	Average wait time of the timed summarized events.
+MAX_TIMER_WAIT	Maximum wait time of the timed summarized events.

mysql-test/suite/perfschema/r/dml_esgs_by_host_by_event_name.result

@@ -24,3 +24,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_host_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_summary_by_host_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+HOST	Host. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with HOST for grouping events.
+COUNT_STAR	Number of summarized events, which includes all timed and untimed events.
+SUM_TIMER_WAIT	Total wait time of the timed summarized events.
+MIN_TIMER_WAIT	Minimum wait time of the timed summarized events.
+AVG_TIMER_WAIT	Average wait time of the timed summarized events.
+MAX_TIMER_WAIT	Maximum wait time of the timed summarized events.

mysql-test/suite/perfschema/r/dml_esgs_by_thread_by_event_name.result

@@ -24,3 +24,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_thread_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_summary_by_thread_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_NAME uniquely identifies the row.
+EVENT_NAME	Event name. Used together with THREAD_ID for grouping events.
+COUNT_STAR	Number of summarized events, which includes all timed and untimed events.
+SUM_TIMER_WAIT	Total wait time of the timed summarized events.
+MIN_TIMER_WAIT	Minimum wait time of the timed summarized events.
+AVG_TIMER_WAIT	Average wait time of the timed summarized events.
+MAX_TIMER_WAIT	Maximum wait time of the timed summarized events.

mysql-test/suite/perfschema/r/dml_esgs_by_user_by_event_name.result

@@ -24,3 +24,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_by_user_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_summary_by_user_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER for grouping events.
+COUNT_STAR	Number of summarized events, which includes all timed and untimed events.
+SUM_TIMER_WAIT	Total wait time of the timed summarized events.
+MIN_TIMER_WAIT	Minimum wait time of the timed summarized events.
+AVG_TIMER_WAIT	Average wait time of the timed summarized events.
+MAX_TIMER_WAIT	Maximum wait time of the timed summarized events.

mysql-test/suite/perfschema/r/dml_esgs_global_by_event_name.result

@@ -23,3 +23,16 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_summary_global_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_summary_global_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_summary_global_by_event_name';
+column_name	column_comment
+EVENT_NAME	Event name.
+COUNT_STAR	Number of summarized events, which includes all timed and untimed events.
+SUM_TIMER_WAIT	Total wait time of the timed summarized events.
+MIN_TIMER_WAIT	Minimum wait time of the timed summarized events.
+AVG_TIMER_WAIT	Average wait time of the timed summarized events.
+MAX_TIMER_WAIT	Maximum wait time of the timed summarized events.

mysql-test/suite/perfschema/r/dml_esms_by_account_by_event_name.result

@@ -24,3 +24,37 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_account_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_by_account_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with HOST and EVENT_NAME for grouping events.
+HOST	Host. Used together with USER and EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER and HOST for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_current table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOIN column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.

mysql-test/suite/perfschema/r/dml_esms_by_digest.result

@@ -25,3 +25,39 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_digest WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_by_digest'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_by_digest';
+column_name	column_comment
+SCHEMA_NAME	Database name. Records are summarised together with DIGEST.
+DIGEST	Performance Schema digest. Records are summarised together with SCHEMA NAME.
+DIGEST_TEXT	The unhashed form of the digest.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_current table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOIN column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.
+FIRST_SEEN	Time at which the digest was first seen.
+LAST_SEEN	Time at which the digest was most recently seen.

mysql-test/suite/perfschema/r/dml_esms_by_host_by_event_name.result

@@ -24,3 +24,36 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_host_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_by_host_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+HOST	Host. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with HOST for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_currentd table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOINW column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.

mysql-test/suite/perfschema/r/dml_esms_by_thread_by_event_name.result

@@ -24,3 +24,36 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_thread_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_by_thread_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_NAME uniquely identifies the row.
+EVENT_NAME	Event name. Used together with THREAD_ID for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_current table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOIN column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.

mysql-test/suite/perfschema/r/dml_esms_by_user_by_event_name.result

@@ -24,3 +24,36 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_by_user_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_by_user_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_current table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOIN column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.

mysql-test/suite/perfschema/r/dml_esms_global_by_event_name.result

@@ -23,3 +23,35 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_summary_global_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_summary_global_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_summary_global_by_event_name';
+column_name	column_comment
+EVENT_NAME	Event name.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+SUM_LOCK_TIME	Sum of the LOCK_TIME column in the events_statements_current table.
+SUM_ERRORS	Sum of the ERRORS column in the events_statements_current table.
+SUM_WARNINGS	Sum of the WARNINGS column in the events_statements_current table.
+SUM_ROWS_AFFECTED	Sum of the ROWS_AFFECTED column in the events_statements_current table.
+SUM_ROWS_SENT	Sum of the ROWS_SENT column in the events_statements_current table.
+SUM_ROWS_EXAMINED	Sum of the ROWS_EXAMINED column in the events_statements_current table.
+SUM_CREATED_TMP_DISK_TABLES	Sum of the CREATED_TMP_DISK_TABLES column in the events_statements_current table.
+SUM_CREATED_TMP_TABLES	Sum of the CREATED_TMP_TABLES column in the events_statements_current table.
+SUM_SELECT_FULL_JOIN	Sum of the SELECT_FULL_JOIN column in the events_statements_current table.
+SUM_SELECT_FULL_RANGE_JOIN	Sum of the SELECT_FULL_RANGE_JOIN column in the events_statements_current table.
+SUM_SELECT_RANGE	Sum of the SELECT_RANGE column in the events_statements_current table.
+SUM_SELECT_RANGE_CHECK	Sum of the SELECT_RANGE_CHECK column in the events_statements_current table.
+SUM_SELECT_SCAN	Sum of the SELECT_SCAN column in the events_statements_current table.
+SUM_SORT_MERGE_PASSES	Sum of the SORT_MERGE_PASSES column in the events_statements_current table.
+SUM_SORT_RANGE	Sum of the SORT_RANGE column in the events_statements_current table.
+SUM_SORT_ROWS	Sum of the SORT_ROWS column in the events_statements_current table.
+SUM_SORT_SCAN	Sum of the SORT_SCAN column in the events_statements_current table.
+SUM_NO_INDEX_USED	Sum of the NO_INDEX_USED column in the events_statements_current table.
+SUM_NO_GOOD_INDEX_USED	Sum of the NO_GOOD_INDEX_USED column in the events_statements_current table.

mysql-test/suite/perfschema/r/dml_events_stages_current.result

@@ -23,3 +23,20 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_current WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_current'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_current';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.

mysql-test/suite/perfschema/r/dml_events_stages_history.result

@@ -27,3 +27,20 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_history WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_history'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_history';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.

mysql-test/suite/perfschema/r/dml_events_stages_history_long.result

@@ -27,3 +27,20 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_stages_history_long WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_stages_history_long'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_stages_history_long';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.

mysql-test/suite/perfschema/r/dml_events_statements_current.result

@@ -23,3 +23,50 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_current WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_current'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_current';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+LOCK_TIME	Time in picoseconds spent waiting for locks. The time is calculated in microseconds but stored in picoseconds for compatibility with other timings.
+SQL_TEXT	The SQL statement, or NULL if the command is not associated with an SQL statement.
+DIGEST	Statement digest.
+DIGEST_TEXT	Statement digest text.
+CURRENT_SCHEMA	Statement's default database for the statement, or NULL if there was none.
+OBJECT_TYPE	Reserved, currently NULL
+OBJECT_SCHEMA	Reserved, currently NULL
+OBJECT_NAME	Reserved, currently NULL
+OBJECT_INSTANCE_BEGIN	Address in memory of the statement object.
+MYSQL_ERRNO	Error code. See MariaDB Error Codes for a full list.
+RETURNED_SQLSTATE	The SQLSTATE value.
+MESSAGE_TEXT	Statement error message. See MariaDB Error Codes.
+ERRORS	0 if SQLSTATE signifies completion (starting with 00) or warning (01), otherwise 1.
+WARNINGS	Number of warnings from the diagnostics area.
+ROWS_AFFECTED	Number of rows affected the statement affected.
+ROWS_SENT	Number of rows returned.
+ROWS_EXAMINED	Number of rows read during the statement's execution.
+CREATED_TMP_DISK_TABLES	Number of on-disk temp tables created by the statement.
+CREATED_TMP_TABLES	Number of temp tables created by the statement.
+SELECT_FULL_JOIN	Number of joins performed by the statement which did not use an index.
+SELECT_FULL_RANGE_JOIN	Number of joins performed by the statement which used a range search of the first table.
+SELECT_RANGE	Number of joins performed by the statement which used a range of the first table.
+SELECT_RANGE_CHECK	Number of joins without keys performed by the statement that check for key usage after each row.
+SELECT_SCAN	Number of joins performed by the statement which used a full scan of the first table.
+SORT_MERGE_PASSES	Number of merge passes by the sort algorithm performed by the statement. If too high, you may need to increase the sort_buffer_size.
+SORT_RANGE	Number of sorts performed by the statement which used a range.
+SORT_ROWS	Number of rows sorted by the statement.
+SORT_SCAN	Number of sorts performed by the statement which used a full table scan.
+NO_INDEX_USED	0 if the statement performed a table scan with an index, 1 if without an index.
+NO_GOOD_INDEX_USED	0 if a good index was found for the statement, 1 if no good index was found. See the Range checked for each record description in the EXPLAIN article.
+NESTING_EVENT_ID	Reserved, currently NULL.
+NESTING_EVENT_TYPE	Reserved, currently NULL.

mysql-test/suite/perfschema/r/dml_events_statements_history.result

@@ -27,3 +27,50 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_history WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_history'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_history';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+LOCK_TIME	Time in picoseconds spent waiting for locks. The time is calculated in microseconds but stored in picoseconds for compatibility with other timings.
+SQL_TEXT	The SQL statement, or NULL if the command is not associated with an SQL statement.
+DIGEST	Statement digest.
+DIGEST_TEXT	Statement digest text.
+CURRENT_SCHEMA	Statement's default database for the statement, or NULL if there was none.
+OBJECT_TYPE	Reserved, currently NULL
+OBJECT_SCHEMA	Reserved, currently NULL
+OBJECT_NAME	Reserved, currently NULL
+OBJECT_INSTANCE_BEGIN	Address in memory of the statement object.
+MYSQL_ERRNO	Error code. See MariaDB Error Codes for a full list.
+RETURNED_SQLSTATE	The SQLSTATE value.
+MESSAGE_TEXT	Statement error message. See MariaDB Error Codes.
+ERRORS	0 if SQLSTATE signifies completion (starting with 00) or warning (01), otherwise 1.
+WARNINGS	Number of warnings from the diagnostics area.
+ROWS_AFFECTED	Number of rows affected the statement affected.
+ROWS_SENT	Number of rows returned.
+ROWS_EXAMINED	Number of rows read during the statement's execution.
+CREATED_TMP_DISK_TABLES	Number of on-disk temp tables created by the statement.
+CREATED_TMP_TABLES	Number of temp tables created by the statement.
+SELECT_FULL_JOIN	Number of joins performed by the statement which did not use an index.
+SELECT_FULL_RANGE_JOIN	Number of joins performed by the statement which used a range search of the first table.
+SELECT_RANGE	Number of joins performed by the statement which used a range of the first table.
+SELECT_RANGE_CHECK	Number of joins without keys performed by the statement that check for key usage after each row.
+SELECT_SCAN	Number of joins performed by the statement which used a full scan of the first table.
+SORT_MERGE_PASSES	Number of merge passes by the sort algorithm performed by the statement. If too high, you may need to increase the sort_buffer_size.
+SORT_RANGE	Number of sorts performed by the statement which used a range.
+SORT_ROWS	Number of rows sorted by the statement.
+SORT_SCAN	Number of sorts performed by the statement which used a full table scan.
+NO_INDEX_USED	0 if the statement performed a table scan with an index, 1 if without an index.
+NO_GOOD_INDEX_USED	0 if a good index was found for the statement, 1 if no good index was found. See the Range checked for each record description in the EXPLAIN article.
+NESTING_EVENT_ID	Reserved, currently NULL.
+NESTING_EVENT_TYPE	Reserved, currently NULL.

mysql-test/suite/perfschema/r/dml_events_statements_history_long.result

@@ -27,3 +27,50 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_statements_history_long WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_statements_history_long'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_statements_history_long';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+LOCK_TIME	Time in picoseconds spent waiting for locks. The time is calculated in microseconds but stored in picoseconds for compatibility with other timings.
+SQL_TEXT	The SQL statement, or NULL if the command is not associated with an SQL statement.
+DIGEST	Statement digest.
+DIGEST_TEXT	Statement digest text.
+CURRENT_SCHEMA	Statement's default database for the statement, or NULL if there was none.
+OBJECT_TYPE	Reserved, currently NULL
+OBJECT_SCHEMA	Reserved, currently NULL
+OBJECT_NAME	Reserved, currently NULL
+OBJECT_INSTANCE_BEGIN	Address in memory of the statement object.
+MYSQL_ERRNO	Error code. See MariaDB Error Codes for a full list.
+RETURNED_SQLSTATE	The SQLSTATE value.
+MESSAGE_TEXT	Statement error message. See MariaDB Error Codes.
+ERRORS	0 if SQLSTATE signifies completion (starting with 00) or warning (01), otherwise 1.
+WARNINGS	Number of warnings from the diagnostics area.
+ROWS_AFFECTED	Number of rows affected the statement affected.
+ROWS_SENT	Number of rows returned.
+ROWS_EXAMINED	Number of rows read during the statement's execution.
+CREATED_TMP_DISK_TABLES	Number of on-disk temp tables created by the statement.
+CREATED_TMP_TABLES	Number of temp tables created by the statement.
+SELECT_FULL_JOIN	Number of joins performed by the statement which did not use an index.
+SELECT_FULL_RANGE_JOIN	Number of joins performed by the statement which used a range search of the first table.
+SELECT_RANGE	Number of joins performed by the statement which used a range of the first table.
+SELECT_RANGE_CHECK	Number of joins without keys performed by the statement that check for key usage after each row.
+SELECT_SCAN	Number of joins performed by the statement which used a full scan of the first table.
+SORT_MERGE_PASSES	Number of merge passes by the sort algorithm performed by the statement. If too high, you may need to increase the sort_buffer_size.
+SORT_RANGE	Number of sorts performed by the statement which used a range.
+SORT_ROWS	Number of rows sorted by the statement.
+SORT_SCAN	Number of sorts performed by the statement which used a full table scan.
+NO_INDEX_USED	0 if the statement performed a table scan with an index, 1 if without an index.
+NO_GOOD_INDEX_USED	0 if a good index was found for the statement, 1 if no good index was found. See the Range checked for each record description in the EXPLAIN article.
+NESTING_EVENT_ID	Reserved, currently NULL.
+NESTING_EVENT_TYPE	Reserved, currently NULL.

mysql-test/suite/perfschema/r/dml_events_waits_current.result

@@ -23,3 +23,29 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_current WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_current'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_current';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+SPINS	Number of spin rounds for a mutex, or NULL if spin rounds are not used, or spinning is not instrumented.
+OBJECT_SCHEMA	Name of the schema that contains the table for table I/O objects, otherwise NULL for file I/O and synchronization objects.
+OBJECT_NAME	File name for file I/O objects, table name for table I/O objects, the socket's IP:PORT value for a socket object or NULL for a synchronization object.
+INDEX_NAME	Name of the index, PRIMARY for the primary key, or NULL for no index used.
+OBJECT_TYPE	FILE for a file object, TABLE or TEMPORARY TABLE for a table object, or NULL for a synchronization object.
+OBJECT_INSTANCE_BEGIN	Address in memory of the object.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.
+OPERATION	Operation type, for example read, write or lock
+NUMBER_OF_BYTES	Number of bytes that the operation read or wrote, or NULL for table I/O waits.
+FLAGS	Reserved for use in the future.

mysql-test/suite/perfschema/r/dml_events_waits_history.result

@@ -27,3 +27,29 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_history WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_history'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_history';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+SPINS	Number of spin rounds for a mutex, or NULL if spin rounds are not used, or spinning is not instrumented.
+OBJECT_SCHEMA	Name of the schema that contains the table for table I/O objects, otherwise NULL for file I/O and synchronization objects.
+OBJECT_NAME	File name for file I/O objects, table name for table I/O objects, the socket's IP:PORT value for a socket object or NULL for a synchronization object.
+INDEX_NAME	Name of the index, PRIMARY for the primary key, or NULL for no index used.
+OBJECT_TYPE	FILE for a file object, TABLE or TEMPORARY TABLE for a table object, or NULL for a synchronization object.
+OBJECT_INSTANCE_BEGIN	Address in memory of the object.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.
+OPERATION	Operation type, for example read, write or lock
+NUMBER_OF_BYTES	Number of bytes that the operation read or wrote, or NULL for table I/O waits.
+FLAGS	Reserved for use in the future.

mysql-test/suite/perfschema/r/dml_events_waits_history_long.result

@@ -27,3 +27,29 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_history_long WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_history_long'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_history_long';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_ID uniquely identifies the row.
+EVENT_ID	Thread's current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.
+END_EVENT_ID	NULL when the event starts, set to the thread's current event number at the end of the event.
+EVENT_NAME	Event instrument name and a NAME from the setup_instruments table
+SOURCE	Name and line number of the source file containing the instrumented code that produced the event.
+TIMER_START	Value in picoseconds when the event timing started or NULL if timing is not collected.
+TIMER_END	Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.
+TIMER_WAIT	Value in picoseconds of the event's duration or NULL if the event has not ended or timing is not collected.
+SPINS	Number of spin rounds for a mutex, or NULL if spin rounds are not used, or spinning is not instrumented.
+OBJECT_SCHEMA	Name of the schema that contains the table for table I/O objects, otherwise NULL for file I/O and synchronization objects.
+OBJECT_NAME	File name for file I/O objects, table name for table I/O objects, the socket's IP:PORT value for a socket object or NULL for a synchronization object.
+INDEX_NAME	Name of the index, PRIMARY for the primary key, or NULL for no index used.
+OBJECT_TYPE	FILE for a file object, TABLE or TEMPORARY TABLE for a table object, or NULL for a synchronization object.
+OBJECT_INSTANCE_BEGIN	Address in memory of the object.
+NESTING_EVENT_ID	EVENT_ID of event within which this event nests.
+NESTING_EVENT_TYPE	Nesting event type. Either statement, stage or wait.
+OPERATION	Operation type, for example read, write or lock
+NUMBER_OF_BYTES	Number of bytes that the operation read or wrote, or NULL for table I/O waits.
+FLAGS	Reserved for use in the future.

mysql-test/suite/perfschema/r/dml_ews_by_account_by_event_name.result

@@ -27,3 +27,18 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_account_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_account_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with HOST and EVENT_NAME for grouping events.
+HOST	Host. Used together with USER and EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER and HOST for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_ews_by_host_by_event_name.result

@@ -27,3 +27,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_host_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_host_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+HOST	Host. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER and HOST for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_ews_by_instance.result

@@ -32,3 +32,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_instance WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_instance'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_by_instance';
+column_name	column_comment
+EVENT_NAME	Event name. Used together with OBJECT_INSTANCE_BEGIN for grouping events.
+OBJECT_INSTANCE_BEGIN	If an instrument creates multiple instances, each instance has a unique OBJECT_INSTANCE_BEGIN value to allow for grouping by instance.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_ews_by_thread_by_event_name.result

@@ -24,3 +24,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_thread_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_thread_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+THREAD_ID	Thread associated with the event. Together with EVENT_NAME uniquely identifies the row.
+EVENT_NAME	Event name. Used together with THREAD_ID for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_ews_by_user_by_event_name.result

@@ -27,3 +27,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_by_user_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_by_user_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+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';
+column_name	column_comment
+USER	User. Used together with EVENT_NAME for grouping events.
+EVENT_NAME	Event name. Used together with USER for grouping events.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_ews_global_by_event_name.result

@@ -23,3 +23,16 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.events_waits_summary_global_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'events_waits_summary_global_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='events_waits_summary_global_by_event_name';
+column_name	column_comment
+EVENT_NAME	Event name.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_file_instances.result

@@ -18,3 +18,13 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_instances WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'file_instances'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_instances';
+column_name	column_comment
+FILE_NAME	File name.
+EVENT_NAME	Instrument name associated with the file.
+OPEN_COUNT	Open handles on the file. A value of greater than zero means that the file is currently open.

mysql-test/suite/perfschema/r/dml_fs_by_event_name.result

@@ -23,3 +23,33 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_summary_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'file_summary_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_summary_by_event_name';
+column_name	column_comment
+EVENT_NAME	Event name.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, including FGETS, FGETC, FREAD, and READ.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+SUM_NUMBER_OF_BYTES_READ	Bytes read by read operations.
+COUNT_WRITE	Number of all write operations, including FPUTS, FPUTC, FPRINTF, VFPRINTF, FWRITE, and PWRITE.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+SUM_NUMBER_OF_BYTES_WRITE	Bytes written by write operations.
+COUNT_MISC	Number of all miscellaneous operations not counted above, including CREATE, DELETE, OPEN, CLOSE, STREAM_OPEN, STREAM_CLOSE, SEEK, TELL, FLUSH, STAT, FSTAT, CHSIZE, RENAME, and SYNC.
+SUM_TIMER_MISC	Total wait time of all miscellaneous operations that are timed.
+MIN_TIMER_MISC	Minimum wait time of all miscellaneous operations that are timed.
+AVG_TIMER_MISC	Average wait time of all miscellaneous operations that are timed.
+MAX_TIMER_MISC	Maximum wait time of all miscellaneous operations that are timed.

mysql-test/suite/perfschema/r/dml_fs_by_instance.result

@@ -23,3 +23,35 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.file_summary_by_instance WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'file_summary_by_instance'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='file_summary_by_instance';
+column_name	column_comment
+FILE_NAME	File name.
+EVENT_NAME	Event name.
+OBJECT_INSTANCE_BEGIN	Address in memory. Together with FILE_NAME and EVENT_NAME uniquely identifies a row.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, including FGETS, FGETC, FREAD, and READ.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+SUM_NUMBER_OF_BYTES_READ	Bytes read by read operations.
+COUNT_WRITE	Number of all write operations, including FPUTS, FPUTC, FPRINTF, VFPRINTF, FWRITE, and PWRITE.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+SUM_NUMBER_OF_BYTES_WRITE	Bytes written by write operations.
+COUNT_MISC	Number of all miscellaneous operations not counted above, including CREATE, DELETE, OPEN, CLOSE, STREAM_OPEN, STREAM_CLOSE, SEEK, TELL, FLUSH, STAT, FSTAT, CHSIZE, RENAME, and SYNC.
+SUM_TIMER_MISC	Total wait time of all miscellaneous operations that are timed.
+MIN_TIMER_MISC	Minimum wait time of all miscellaneous operations that are timed.
+AVG_TIMER_MISC	Average wait time of all miscellaneous operations that are timed.
+MAX_TIMER_MISC	Maximum wait time of all miscellaneous operations that are timed.

mysql-test/suite/perfschema/r/dml_host_cache.result

@@ -25,3 +25,39 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.host_cache WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'host_cache'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='host_cache';
+column_name	column_comment
+IP	Client IP address.
+HOST	IP's resolved DNS host name, or NULL if unknown.
+HOST_VALIDATED	YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.
+SUM_CONNECT_ERRORS	Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.
+COUNT_HOST_BLOCKED_ERRORS	Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.
+COUNT_NAMEINFO_TRANSIENT_ERRORS	Number of transient errors during IP-to-host DNS lookups.
+COUNT_NAMEINFO_PERMANENT_ERRORS	Number of permanent errors during IP-to-host DNS lookups.
+COUNT_FORMAT_ERRORS	Number of host name format errors, for example a numeric host column.
+COUNT_ADDRINFO_TRANSIENT_ERRORS	Number of transient errors during host-to-IP reverse DNS lookups.
+COUNT_ADDRINFO_PERMANENT_ERRORS	Number of permanent errors during host-to-IP reverse DNS lookups.
+COUNT_FCRDNS_ERRORS	Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.
+COUNT_HOST_ACL_ERRORS	Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.
+COUNT_NO_AUTH_PLUGIN_ERRORS	Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.
+COUNT_AUTH_PLUGIN_ERRORS	Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.
+COUNT_HANDSHAKE_ERRORS	Number of errors detected at the wire protocol level.
+COUNT_PROXY_USER_ERRORS	Number of errors detected when a proxy user is proxied to a user that does not exist.
+COUNT_PROXY_USER_ACL_ERRORS	Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn't have the PROXY privilege.
+COUNT_AUTHENTICATION_ERRORS	Number of errors where authentication failed.
+COUNT_SSL_ERRORS	Number of errors due to TLS problems.
+COUNT_MAX_USER_CONNECTIONS_ERRORS	Number of errors due to the per-user quota being exceeded.
+COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS	Number of errors due to the per-hour quota being exceeded.
+COUNT_DEFAULT_DATABASE_ERRORS	Number of errors due to the user not having permission to access the specified default database, or it not existing.
+COUNT_INIT_CONNECT_ERRORS	Number of errors due to statements in the init_connect system variable.
+COUNT_LOCAL_ERRORS	Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.
+COUNT_UNKNOWN_ERRORS	Number of unknown errors that cannot be allocated to another column.
+FIRST_SEEN	Timestamp of the first connection attempt by the IP.
+LAST_SEEN	Timestamp of the most recent connection attempt by the IP.
+FIRST_ERROR_SEEN	Timestamp of the first error seen from the IP.
+LAST_ERROR_SEEN	Timestamp of the most recent error seen from the IP.

mysql-test/suite/perfschema/r/dml_hosts.result

@@ -23,3 +23,13 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.hosts WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'hosts'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='hosts';
+column_name	column_comment
+HOST	Host name used by the client to connect, NULL for internal threads or user sessions that failed to authenticate.
+CURRENT_CONNECTIONS	Current number of the host's connections.
+TOTAL_CONNECTIONS	Total number of the host's connections

mysql-test/suite/perfschema/r/dml_mutex_instances.result

@@ -18,3 +18,13 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.mutex_instances WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'mutex_instances'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='mutex_instances';
+column_name	column_comment
+NAME	Instrument name associated with the mutex.
+OBJECT_INSTANCE_BEGIN	Memory address of the instrumented mutex.
+LOCKED_BY_THREAD_ID	The THREAD_ID of the locking thread if a thread has a mutex locked, otherwise NULL.

mysql-test/suite/perfschema/r/dml_os_global_by_type.result

@@ -43,3 +43,18 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.objects_summary_global_by_type WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'objects_summary_global_by_type'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='objects_summary_global_by_type';
+column_name	column_comment
+OBJECT_TYPE	Groups records together with OBJECT_SCHEMA and OBJECT_NAME.
+OBJECT_SCHEMA	Groups records together with OBJECT_TYPE and OBJECT_NAME.
+OBJECT_NAME	Groups records together with OBJECT_SCHEMA and OBJECT_TYPE.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.

mysql-test/suite/perfschema/r/dml_performance_timers.result

@@ -27,3 +27,14 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.performance_timers WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'performance_timers'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='performance_timers';
+column_name	column_comment
+TIMER_NAME	Time name, used in the setup_timers table.
+TIMER_FREQUENCY	Number of timer units per second. Dependent on the processor speed.
+TIMER_RESOLUTION	Number of timer units by which timed values increase each time.
+TIMER_OVERHEAD	Minimum timer overhead, determined during initialization by calling the timer 20 times and selecting the smallest value. Total overhead will be at least double this, as the timer is called at the beginning and end of each timed event.

mysql-test/suite/perfschema/r/dml_rwlock_instances.result

@@ -18,3 +18,14 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.rwlock_instances WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'rwlock_instances'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='rwlock_instances';
+column_name	column_comment
+NAME	Instrument name associated with the read write lock
+OBJECT_INSTANCE_BEGIN	Address in memory of the instrumented lock
+WRITE_LOCKED_BY_THREAD_ID	THREAD_ID of the locking thread if locked in write (exclusive) mode, otherwise NULL.
+READ_LOCKED_BY_COUNT	Count of current read locks held

mysql-test/suite/perfschema/r/dml_session_account_connect_attrs.result

@@ -23,3 +23,14 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.session_account_connect_attrs WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'session_account_connect_attrs'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='session_account_connect_attrs';
+column_name	column_comment
+PROCESSLIST_ID	Session connection identifier.
+ATTR_NAME	Attribute name.
+ATTR_VALUE	Attribute value.
+ORDINAL_POSITION	Order in which attribute was added to the connection attributes.

mysql-test/suite/perfschema/r/dml_session_connect_attrs.result

@@ -23,3 +23,14 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.session_connect_attrs WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'session_connect_attrs'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='session_connect_attrs';
+column_name	column_comment
+PROCESSLIST_ID	Session connection identifier.
+ATTR_NAME	Attribute name.
+ATTR_VALUE	Attribute value.
+ORDINAL_POSITION	Order in which attribute was added to the connection attributes.

mysql-test/suite/perfschema/r/dml_setup_actors.result

@@ -58,3 +58,13 @@ truncate table performance_schema.setup_actors;
 insert into performance_schema.setup_actors
 select * from test.setup_actors;
 drop table test.setup_actors;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_actors';
+column_name	column_comment
+HOST	Host name, either a literal, or the % wildcard representing any host.
+USER	User name, either a literal or the % wildcard representing any name.
+ROLE	Unused

mysql-test/suite/perfschema/r/dml_setup_consumers.result

@@ -51,3 +51,12 @@ LOCK TABLES performance_schema.setup_consumers READ;
 UNLOCK TABLES;
 LOCK TABLES performance_schema.setup_consumers WRITE;
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_consumers';
+column_name	column_comment
+NAME	Consumer name
+ENABLED	YES or NO for whether or not the consumer is enabled. You can modify this column to ensure that event information is added, or is not added.

mysql-test/suite/perfschema/r/dml_setup_instruments.result

@@ -80,3 +80,13 @@ UNLOCK TABLES;
 
 UPDATE performance_schema.setup_instruments SET timed='NO'
 ORDER BY RAND();
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_instruments';
+column_name	column_comment
+NAME	Instrument name
+ENABLED	Whether or not the instrument is enabled. It can be disabled, and the instrument will produce no events.
+TIMED	Whether or not the instrument is timed. It can be set, but if disabled, events produced by the instrument will have NULL values for the corresponding TIMER_START, TIMER_END, and TIMER_WAIT values.

mysql-test/suite/perfschema/r/dml_setup_objects.result

@@ -68,3 +68,15 @@ truncate table performance_schema.setup_objects;
 insert into performance_schema.setup_objects
 select * from test.setup_objects;
 drop table test.setup_objects;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_objects';
+column_name	column_comment
+OBJECT_TYPE	Type of object to instrument. Currently, only TABLE, for base table.
+OBJECT_SCHEMA	Schema containing the object, either the literal or % for any schema.
+OBJECT_NAME	Name of the instrumented object, either the literal or % for any object.
+ENABLED	Whether the object's events are instrumented or not. Can be disabled, in which case monitoring is not enabled for those objects.
+TIMED	Whether the object's events are timed or not. Can be modified.

mysql-test/suite/perfschema/r/dml_setup_timers.result

@@ -59,3 +59,12 @@ idle	MICROSECOND
 wait	CYCLE
 stage	NANOSECOND
 statement	NANOSECOND
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='setup_timers';
+column_name	column_comment
+NAME	Type of instrument the timer is used for.
+TIMER_NAME	Timer applying to the instrument type. Can be modified.

mysql-test/suite/perfschema/r/dml_socket_instances.result

@@ -18,3 +18,17 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_instances WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'socket_instances'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_instances';
+column_name	column_comment
+EVENT_NAME	NAME from the setup_instruments table, and the name of the wait/io/socket/* instrument that produced the event.
+OBJECT_INSTANCE_BEGIN	Memory address of the object.
+THREAD_ID	Thread identifier that the server assigns to each socket.
+SOCKET_ID	The socket's internal file handle.
+IP	Client IP address. Blank for Unix socket file, otherwise an IPv4 or IPv6 address. Together with the PORT identifies the connection.
+PORT	TCP/IP port number, from 0 to 65535. Together with the IP identifies the connection.
+STATE	Socket status, either IDLE if waiting to receive a request from a client, or ACTIVE

mysql-test/suite/perfschema/r/dml_socket_summary_by_event_name.result

@@ -24,3 +24,33 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_summary_by_event_name WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'socket_summary_by_event_name'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_summary_by_event_name';
+column_name	column_comment
+EVENT_NAME	Socket instrument.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, including RECV, RECVFROM, and RECVMSG.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+SUM_NUMBER_OF_BYTES_READ	Bytes read by read operations.
+COUNT_WRITE	Number of all write operations, including SEND, SENDTO, and SENDMSG.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+SUM_NUMBER_OF_BYTES_WRITE	Bytes written by write operations.
+COUNT_MISC	Number of all miscellaneous operations not counted above, including CONNECT, LISTEN, ACCEPT, CLOSE, and SHUTDOWN.
+SUM_TIMER_MISC	Total wait time of all miscellaneous operations that are timed.
+MIN_TIMER_MISC	Minimum wait time of all miscellaneous operations that are timed.
+AVG_TIMER_MISC	Average wait time of all miscellaneous operations that are timed.
+MAX_TIMER_MISC	Maximum wait time of all miscellaneous operations that are timed.

mysql-test/suite/perfschema/r/dml_socket_summary_by_instance.result

@@ -24,3 +24,34 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.socket_summary_by_instance WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'socket_summary_by_instance'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='socket_summary_by_instance';
+column_name	column_comment
+EVENT_NAME	Socket instrument.
+OBJECT_INSTANCE_BEGIN	Address in memory.
+COUNT_STAR	Number of summarized events
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, including RECV, RECVFROM, and RECVMSG.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+SUM_NUMBER_OF_BYTES_READ	Bytes read by read operations.
+COUNT_WRITE	Number of all write operations, including SEND, SENDTO, and SENDMSG.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+SUM_NUMBER_OF_BYTES_WRITE	Bytes written by write operations.
+COUNT_MISC	Number of all miscellaneous operations not counted above, including CONNECT, LISTEN, ACCEPT, CLOSE, and SHUTDOWN.
+SUM_TIMER_MISC	Total wait time of all miscellaneous operations that are timed.
+MIN_TIMER_MISC	Minimum wait time of all miscellaneous operations that are timed.
+AVG_TIMER_MISC	Average wait time of all miscellaneous operations that are timed.
+MAX_TIMER_MISC	Maximum wait time of all miscellaneous operations that are timed.

mysql-test/suite/perfschema/r/dml_threads.result

@@ -32,3 +32,24 @@ LOCK TABLES performance_schema.threads READ;
 UNLOCK TABLES;
 LOCK TABLES performance_schema.threads WRITE;
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='threads';
+column_name	column_comment
+THREAD_ID	A unique thread identifier.
+NAME	Name associated with the server's thread instrumentation code, for example thread/sql/main for the server's main() function, and thread/sql/one_connection for a user connection.
+TYPE	FOREGROUND or BACKGROUND, depending on the thread type. User connection threads are FOREGROUND, internal server threads are BACKGROUND.
+PROCESSLIST_ID	The PROCESSLIST.ID value for threads displayed in the INFORMATION_SCHEMA.PROCESSLIST table, or 0 for background threads. Also corresponds with the CONNECTION_ID() return value for the thread.
+PROCESSLIST_USER	Foreground thread user, or NULL for a background thread.
+PROCESSLIST_HOST	Foreground thread host, or NULL for a background thread.
+PROCESSLIST_DB	Thread's default database, or NULL if none exists.
+PROCESSLIST_COMMAND	Type of command executed by the thread. These correspond to the the COM_xxx client/server protocol commands, and the Com_xxx status variables. See Thread Command Values.
+PROCESSLIST_TIME	Time in seconds the thread has been in its current state.
+PROCESSLIST_STATE	Action, event or state indicating what the thread is doing.
+PROCESSLIST_INFO	Statement being executed by the thread, or NULL if a statement is not being executed. If a statement results in calling other statements, such as for a stored procedure, the innermost statement from the stored procedure is shown here.
+PARENT_THREAD_ID	THREAD_ID of the parent thread, if any. Subthreads can for example be spawned as a result of INSERT DELAYED statements.
+ROLE	Unused.
+INSTRUMENTED	YES or NO for Whether the thread is instrumented or not. For foreground threads, the initial value is determined by whether there's a user/host match in the setup_actors table. Subthreads are again matched, while for background threads, this will be set to YES by default. To monitor events that the thread executes, INSTRUMENTED must be YES and the thread_instrumentation consumer in the setup_consumers table must also be YES.

mysql-test/suite/perfschema/r/dml_tiws_by_index_usage.result

@@ -24,3 +24,49 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_io_waits_summary_by_index_usage WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'table_io_waits_summary_by_index_usage'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_io_waits_summary_by_index_usage';
+column_name	column_comment
+OBJECT_TYPE	TABLE in the case of all indexes.
+OBJECT_SCHEMA	Schema name.
+OBJECT_NAME	Table name.
+INDEX_NAME	Index name, or PRIMARY for the primary index, NULL for no index (inserts are counted in this case).
+COUNT_STAR	Number of summarized events and the sum of the x_READ and x_WRITE columns.
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, and the sum of the equivalent x_FETCH columns.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+COUNT_WRITE	Number of all write operations, and the sum of the equivalent x_INSERT, x_UPDATE and x_DELETE columns.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+COUNT_FETCH	Number of all fetch operations.
+SUM_TIMER_FETCH	Total wait time of all fetch operations that are timed.
+MIN_TIMER_FETCH	Minimum wait time of all fetch operations that are timed.
+AVG_TIMER_FETCH	Average wait time of all fetch operations that are timed.
+MAX_TIMER_FETCH	Maximum wait time of all fetch operations that are timed.
+COUNT_INSERT	Number of all insert operations.
+SUM_TIMER_INSERT	Total wait time of all insert operations that are timed.
+MIN_TIMER_INSERT	Minimum wait time of all insert operations that are timed.
+AVG_TIMER_INSERT	Average wait time of all insert operations that are timed.
+MAX_TIMER_INSERT	Maximum wait time of all insert operations that are timed.
+COUNT_UPDATE	Number of all update operations.
+SUM_TIMER_UPDATE	Total wait time of all update operations that are timed.
+MIN_TIMER_UPDATE	Minimum wait time of all update operations that are timed.
+AVG_TIMER_UPDATE	Average wait time of all update operations that are timed.
+MAX_TIMER_UPDATE	Maximum wait time of all update operations that are timed.
+COUNT_DELETE	Number of all delete operations.
+SUM_TIMER_DELETE	Total wait time of all delete operations that are timed.
+MIN_TIMER_DELETE	Minimum wait time of all delete operations that are timed.
+AVG_TIMER_DELETE	Average wait time of all delete operations that are timed.
+MAX_TIMER_DELETE	Maximum wait time of all delete operations that are timed.

mysql-test/suite/perfschema/r/dml_tiws_by_table.result

@@ -24,3 +24,48 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_io_waits_summary_by_table WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'table_io_waits_summary_by_table'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_io_waits_summary_by_table';
+column_name	column_comment
+OBJECT_TYPE	Since this table records waits by table, always set to TABLE.
+OBJECT_SCHEMA	Schema name.
+OBJECT_NAME	Table name.
+COUNT_STAR	Number of summarized events and the sum of the x_READ and x_WRITE columns.
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, and the sum of the equivalent x_FETCH columns.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+COUNT_WRITE	Number of all write operations, and the sum of the equivalent x_INSERT, x_UPDATE and x_DELETE columns.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+COUNT_FETCH	Number of all fetch operations.
+SUM_TIMER_FETCH	Total wait time of all fetch operations that are timed.
+MIN_TIMER_FETCH	Minimum wait time of all fetch operations that are timed.
+AVG_TIMER_FETCH	Average wait time of all fetch operations that are timed.
+MAX_TIMER_FETCH	Maximum wait time of all fetch operations that are timed.
+COUNT_INSERT	Number of all insert operations.
+SUM_TIMER_INSERT	Total wait time of all insert operations that are timed.
+MIN_TIMER_INSERT	Minimum wait time of all insert operations that are timed.
+AVG_TIMER_INSERT	Average wait time of all insert operations that are timed.
+MAX_TIMER_INSERT	Maximum wait time of all insert operations that are timed.
+COUNT_UPDATE	Number of all update operations.
+SUM_TIMER_UPDATE	Total wait time of all update operations that are timed.
+MIN_TIMER_UPDATE	Minimum wait time of all update operations that are timed.
+AVG_TIMER_UPDATE	Average wait time of all update operations that are timed.
+MAX_TIMER_UPDATE	Maximum wait time of all update operations that are timed.
+COUNT_DELETE	Number of all delete operations.
+SUM_TIMER_DELETE	Total wait time of all delete operations that are timed.
+MIN_TIMER_DELETE	Minimum wait time of all delete operations that are timed.
+AVG_TIMER_DELETE	Average wait time of all delete operations that are timed.
+MAX_TIMER_DELETE	Maximum wait time of all delete operations that are timed.

mysql-test/suite/perfschema/r/dml_tlws_by_table.result

@@ -24,3 +24,83 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.table_lock_waits_summary_by_table WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'table_lock_waits_summary_by_table'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='table_lock_waits_summary_by_table';
+column_name	column_comment
+OBJECT_TYPE	Since this table records waits by table, always set to TABLE.
+OBJECT_SCHEMA	Schema name.
+OBJECT_NAME	Table name.
+COUNT_STAR	Number of summarized events and the sum of the x_READ and x_WRITE columns.
+SUM_TIMER_WAIT	Total wait time of the summarized events that are timed.
+MIN_TIMER_WAIT	Minimum wait time of the summarized events that are timed.
+AVG_TIMER_WAIT	Average wait time of the summarized events that are timed.
+MAX_TIMER_WAIT	Maximum wait time of the summarized events that are timed.
+COUNT_READ	Number of all read operations, and the sum of the equivalent x_READ_NORMAL, x_READ_WITH_SHARED_LOCKS, x_READ_HIGH_PRIORITY and x_READ_NO_INSERT columns.
+SUM_TIMER_READ	Total wait time of all read operations that are timed.
+MIN_TIMER_READ	Minimum wait time of all read operations that are timed.
+AVG_TIMER_READ	Average wait time of all read operations that are timed.
+MAX_TIMER_READ	Maximum wait time of all read operations that are timed.
+COUNT_WRITE	Number of all write operations, and the sum of the equivalent x_WRITE_ALLOW_WRITE, x_WRITE_CONCURRENT_INSERT, x_WRITE_DELAYED, x_WRITE_LOW_PRIORITY and x_WRITE_NORMAL columns.
+SUM_TIMER_WRITE	Total wait time of all write operations that are timed.
+MIN_TIMER_WRITE	Minimum wait time of all write operations that are timed.
+AVG_TIMER_WRITE	Average wait time of all write operations that are timed.
+MAX_TIMER_WRITE	Maximum wait time of all write operations that are timed.
+COUNT_READ_NORMAL	Number of all internal read normal locks.
+SUM_TIMER_READ_NORMAL	Total wait time of all internal read normal locks that are timed.
+MIN_TIMER_READ_NORMAL	Minimum wait time of all internal read normal locks that are timed.
+AVG_TIMER_READ_NORMAL	Average wait time of all internal read normal locks that are timed.
+MAX_TIMER_READ_NORMAL	Maximum wait time of all internal read normal locks that are timed.
+COUNT_READ_WITH_SHARED_LOCKS	Number of all internal read with shared locks.
+SUM_TIMER_READ_WITH_SHARED_LOCKS	Total wait time of all internal read with shared locks that are timed.
+MIN_TIMER_READ_WITH_SHARED_LOCKS	Minimum wait time of all internal read with shared locks that are timed.
+AVG_TIMER_READ_WITH_SHARED_LOCKS	Average wait time of all internal read with shared locks that are timed.
+MAX_TIMER_READ_WITH_SHARED_LOCKS	Maximum wait time of all internal read with shared locks that are timed.
+COUNT_READ_HIGH_PRIORITY	Number of all internal read high priority locks.
+SUM_TIMER_READ_HIGH_PRIORITY	Total wait time of all internal read high priority locks that are timed.
+MIN_TIMER_READ_HIGH_PRIORITY	Minimum wait time of all internal read high priority locks that are timed.
+AVG_TIMER_READ_HIGH_PRIORITY	Average wait time of all internal read high priority locks that are timed.
+MAX_TIMER_READ_HIGH_PRIORITY	Maximum wait time of all internal read high priority locks that are timed.
+COUNT_READ_NO_INSERT	Number of all internal read no insert locks.
+SUM_TIMER_READ_NO_INSERT	Total wait time of all internal read no insert locks that are timed.
+MIN_TIMER_READ_NO_INSERT	Minimum wait time of all internal read no insert locks that are timed.
+AVG_TIMER_READ_NO_INSERT	Average wait time of all internal read no insert locks that are timed.
+MAX_TIMER_READ_NO_INSERT	Maximum wait time of all internal read no insert locks that are timed.
+COUNT_READ_EXTERNAL	Number of all external read locks.
+SUM_TIMER_READ_EXTERNAL	Total wait time of all external read locks that are timed.
+MIN_TIMER_READ_EXTERNAL	Minimum wait time of all external read locks that are timed.
+AVG_TIMER_READ_EXTERNAL	Average wait time of all external read locks that are timed.
+MAX_TIMER_READ_EXTERNAL	Maximum wait time of all external read locks that are timed.
+COUNT_WRITE_ALLOW_WRITE	Number of all internal read normal locks.
+SUM_TIMER_WRITE_ALLOW_WRITE	Total wait time of all internal write allow write locks that are timed.
+MIN_TIMER_WRITE_ALLOW_WRITE	Minimum wait time of all internal write allow write locks that are timed.
+AVG_TIMER_WRITE_ALLOW_WRITE	Average wait time of all internal write allow write locks that are timed.
+MAX_TIMER_WRITE_ALLOW_WRITE	Maximum wait time of all internal write allow write locks that are timed.
+COUNT_WRITE_CONCURRENT_INSERT	Number of all internal concurrent insert write locks.
+SUM_TIMER_WRITE_CONCURRENT_INSERT	Total wait time of all internal concurrent insert write locks that are timed.
+MIN_TIMER_WRITE_CONCURRENT_INSERT	Minimum wait time of all internal concurrent insert write locks that are timed.
+AVG_TIMER_WRITE_CONCURRENT_INSERT	Average wait time of all internal concurrent insert write locks that are timed.
+MAX_TIMER_WRITE_CONCURRENT_INSERT	Maximum wait time of all internal concurrent insert write locks that are timed.
+COUNT_WRITE_DELAYED	Number of all internal write delayed locks.
+SUM_TIMER_WRITE_DELAYED	Total wait time of all internal write delayed locks that are timed.
+MIN_TIMER_WRITE_DELAYED	Minimum wait time of all internal write delayed locks that are timed.
+AVG_TIMER_WRITE_DELAYED	Average wait time of all internal write delayed locks that are timed.
+MAX_TIMER_WRITE_DELAYED	Maximum wait time of all internal write delayed locks that are timed.
+COUNT_WRITE_LOW_PRIORITY	Number of all internal write low priority locks.
+SUM_TIMER_WRITE_LOW_PRIORITY	Total wait time of all internal write low priority locks that are timed.
+MIN_TIMER_WRITE_LOW_PRIORITY	Minimum wait time of all internal write low priority locks that are timed.
+AVG_TIMER_WRITE_LOW_PRIORITY	Average wait time of all internal write low priority locks that are timed.
+MAX_TIMER_WRITE_LOW_PRIORITY	Maximum wait time of all internal write low priority locks that are timed.
+COUNT_WRITE_NORMAL	Number of all internal write normal locks.
+SUM_TIMER_WRITE_NORMAL	Total wait time of all internal write normal locks that are timed.
+MIN_TIMER_WRITE_NORMAL	Minimum wait time of all internal write normal locks that are timed.
+AVG_TIMER_WRITE_NORMAL	Average wait time of all internal write normal locks that are timed.
+MAX_TIMER_WRITE_NORMAL	Maximum wait time of all internal write normal locks that are timed.
+COUNT_WRITE_EXTERNAL	Number of all external write locks.
+SUM_TIMER_WRITE_EXTERNAL	Total wait time of all external write locks that are timed.
+MIN_TIMER_WRITE_EXTERNAL	Minimum wait time of all external write locks that are timed.
+AVG_TIMER_WRITE_EXTERNAL	Average wait time of all external write locks that are timed.
+MAX_TIMER_WRITE_EXTERNAL	Maximum wait time of all external write locks that are timed.

mysql-test/suite/perfschema/r/dml_users.result

@@ -23,3 +23,13 @@ UNLOCK TABLES;
 LOCK TABLES performance_schema.users WRITE;
 ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'users'
 UNLOCK TABLES;
+#
+# MDEV-25325 column_comment for performance_schema tables
+#
+select column_name, column_comment 
+from information_schema.columns 
+where table_schema='performance_schema' and table_name='users';
+column_name	column_comment
+USER	The connection's client user name for the connection, or NULL if an internal thread.
+CURRENT_CONNECTIONS	Current connections for the user.
+TOTAL_CONNECTIONS	Total connections for the user.

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';