MDEV-33145 Add FLUSH GLOBAL STATUS

- FLUSH GLOBAL STATUS now resets most global_status_vars.
  At this stage, this is mainly to be used for testing.
- FLUSH SESSION STATUS added as an alias for FLUSH STATUS.
- FLUSH STATUS does not require any privilege (before required RELOAD).
- FLUSH GLOBAL STATUS requires RELOAD privilege.
- All global status reset moved to FLUSH GLOBAL STATUS.
- Replication semisync status variables are now reset by
  FLUSH GLOBAL STATUS.
- In test cases, the only changes are:
  - Replace FLUSH STATUS with FLUSH GLOBAL STATUS
  - Replace FLUSH STATUS with FLUSH STATUS; FLUSH GLOBAL STATUS.
    This was only done in a few tests where the test was using SHOW STATUS
    for both local and global variables.
- Uptime_since_flush_status is now always provided, independent if
  ENABLED_PROFILING is enabled when compiling MariaDB.
- @@global.Uptime_since_flush_status is reset on FLUSH GLOBAL STATUS
  and @@session.Uptime_since_flush_status is reset on FLUSH SESSION STATUS.
- When connected, @@session.Uptime_since_flush_status is set to 0.

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

@@ -17,7 +17,7 @@ update performance_schema.threads SET instrumented = 'YES'
 
 # reset lost counters
 truncate table performance_schema.events_statements_summary_by_digest;
-flush status;
+flush global status;
 
 --disable_warnings
 DROP TABLE IF EXISTS t1;

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

@@ -15,7 +15,7 @@ WHERE name LIKE 'wait/synch/mutex/%'
 
 # reset lost counters
 truncate table performance_schema.events_statements_summary_by_digest;
-flush status;
+flush global status;
 
 # Make sure objects are instrumented
 select NAME from performance_schema.mutex_instances

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

@@ -45,6 +45,6 @@ show global status like "connection_errors_%";
 
 SET @@GLOBAL.debug_dbug = @saved_dbug;
 
-flush status;
+flush global status;
 show global status like "connection_errors_%";
 

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

@@ -109,7 +109,7 @@ prepare dump_waits_history_long from
 
 # reset lost counters
 truncate table performance_schema.events_statements_summary_by_digest;
-flush status;
+flush global status;
 
 flush tables;
 

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

@@ -24,7 +24,7 @@ CREATE TABLE test.t_range(a int, b int, PRIMARY KEY(a));
 INSERT INTO test.t_range values (1, 1), (2,2), (3, 3), (4, 4), (5, 5);
 INSERT INTO test.t_range values (6, 6), (7,7), (8, 8), (9, 9), (10, 10);
 
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 
 let $initial= `SELECT VARIABLE_VALUE FROM performance_schema.global_status WHERE VARIABLE_NAME = 'Select_range'`;
 

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

@@ -16,7 +16,7 @@ truncate table performance_schema.events_waits_history_long;
 
 # Reset lost counters to a known state
 truncate table performance_schema.events_statements_summary_by_digest;
-flush status;
+flush global status;
 
 # Code to test
 

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

@@ -60,7 +60,7 @@ update performance_schema.setup_instruments set enabled='YES', timed='YES'
 # Start from a known clean state, to avoid noise from previous tests
 truncate table performance_schema.events_statements_summary_by_digest;
 flush tables;
-flush status;
+flush global status;
 
 truncate performance_schema.events_waits_current;
 truncate performance_schema.events_waits_history;

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

@@ -12,7 +12,7 @@ drop procedure if exists check_instrument;
 
 # reset counters
 truncate table performance_schema.events_statements_summary_by_digest;
-flush status;
+flush global status;
 
 # Print known global memory instruments (PSI_FLAG_GLOBAL),
 # see maintenance of count_global_expected below.

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

@@ -20,7 +20,7 @@ SET GLOBAL query_cache_size=1355776;
 
 flush query cache;
 reset query cache;
-flush status;
+flush global status;
 
 --disable_ps2_protocol
 select * from t1;
@@ -57,5 +57,5 @@ show global status like "Qcache_hits";
 SET GLOBAL query_cache_size=@save_query_cache_size;
 
 drop table t1;
-flush status;
+flush global status;
 

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

@@ -25,7 +25,7 @@ SET @@session.sql_log_bin=OFF;
 connection default;
 USE test;
 
-flush status;
+flush global status;
 
 --echo #
 --echo # Create results table
@@ -277,10 +277,10 @@ FROM test.status_results
 ORDER BY variable_name;
 
 --echo # ================================================================================
---echo # TEST 8: FLUSH STATUS should clear account, host and user status
+--echo # TEST 8: FLUSH GLOBAL STATUS should clear account, host and user status
 --echo # ================================================================================
 --echo #
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 --echo #
 SELECT * FROM status_by_account WHERE user IN ('user1', 'user2', 'user3') AND variable_name IN ('handler_delete');
 --echo #

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

@@ -93,7 +93,7 @@ SELECT variable_value FROM status_by_thread
   WHERE variable_name = "bytes_received" and thread_id = @thread_id INTO @bytes_before;
 --echo #
 --echo # Reset status counters
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 --echo #
 --echo # Record bytes_received after reset
 SELECT variable_value FROM status_by_thread
@@ -170,7 +170,7 @@ SET long_query_time = @@global.long_query_time;
 --source include/assert.inc
 
 --echo #
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 --echo #
 
 ## Global value requested from the default session after FLUSH must remain the same

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

@@ -8,6 +8,7 @@ select 2;
 SHOW STATUS LIKE 'Last_query_cost';
 
 flush status;
+flush global status;
 SHOW STATUS LIKE 'Created_tmp_tables';
 
 --echo #

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

@@ -67,7 +67,7 @@ select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
 
 # While at it, check that FLUSH STATUS Resets the lost counter
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 
 select variable_value from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
@@ -124,7 +124,7 @@ select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
 --enable_warnings
 
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 
 
 #####################################################################################

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

@@ -86,8 +86,7 @@ select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_TABLE_LOCK_STAT_LOST';
 --enable_warnings
 
-flush status;
-
+flush global status;
 
 #######################################
 # Update setup_objects to DISABLE TABLE

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

@@ -53,8 +53,8 @@ select COUNT_STAR from performance_schema.table_io_waits_summary_by_index_usage
 select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
 
-# While at it, check that FLUSH STATUS Resets the lost counter
-FLUSH STATUS;
+# While at it, check that FLUSH GLOBAL STATUS Resets the lost counter
+FLUSH GLOBAL STATUS;
 
 select variable_value from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';

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

@@ -14,7 +14,7 @@ select variable_value > 0 from information_schema.global_status
 --enable_warnings
 
 # While at it, check that flush status resets the lost counter
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 
 --disable_warnings
 select variable_value from information_schema.global_status

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

@@ -35,7 +35,7 @@ show global status like "%performance_schema_prepared_statements_lost%";
 show global status like "%performance_schema_prepared_statements_lost%";
 
 # Flush status now
-flush status;
+flush global status;
 
 # status after flush. expect 0.
 show global status like "%performance_schema_prepared_statements_lost%";

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

@@ -44,7 +44,7 @@ select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_TABLE_LOCK_STAT_LOST';
 
 # While at it, check that FLUSH STATUS Resets the lost counter
-FLUSH STATUS;
+FLUSH GLOBAL STATUS;
 
 select variable_value from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_TABLE_LOCK_STAT_LOST';

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

@@ -11,7 +11,7 @@
 
 # Setup
 
-flush status;
+flush global status;
 
 SET @saved_thread_cache_size = @@global.thread_cache_size;