Backporting slow log simulation logic details from 10.2 to 10.1

Simulate slow statements only for COM_QUERY and COM_STMT_EXECUTE commands,
to exclude mysqld_stmt_prepare() and mysqld_stmt_close() entries from the log,
as they are not relevant for log_slow_debug.test. This simplifies the test.

mysql-test/r/log_slow_debug.result

@@ -14,14 +14,6 @@ FROM mysql.slow_log
 WHERE sql_text NOT LIKE '%debug_dbug%';
 END
 $$
-CREATE PROCEDURE show_slow_log_exclude_ps()
-BEGIN
-SELECT CONCAT('[slow] ', sql_text) AS sql_text
-FROM mysql.slow_log
-WHERE sql_text NOT LIKE '%debug_dbug%'
-       AND sql_text NOT IN ('Prepare','Close stmt');
-END
-$$
 #
 # Expect all admin statements in the slow log (ON,DEFAULT)
 #
@@ -41,7 +33,7 @@ PREPARE stmt FROM 'ALTER TABLE t4 MODIFY a INT DEFAULT 1';
 EXECUTE stmt;
 DEALLOCATE PREPARE stmt;
 DROP TABLE t4;
-CALL show_slow_log_exclude_ps();
+CALL show_slow_log();
 sql_text
 [slow] TRUNCATE TABLE mysql.slow_log
 [slow] CREATE TABLE t1 (a INT)
@@ -123,7 +115,7 @@ PREPARE stmt FROM 'ALTER TABLE t4 MODIFY a INT DEFAULT 1';
 EXECUTE stmt;
 DEALLOCATE PREPARE stmt;
 DROP TABLE t4;
-CALL show_slow_log_exclude_ps();
+CALL show_slow_log();
 sql_text
 [slow] TRUNCATE TABLE mysql.slow_log
 [slow] CREATE TABLE t1 (a INT)
@@ -143,4 +135,3 @@ SET @@global.slow_query_log= @org_slow_query_log;
 SET @@global.log_output= @org_log_output;
 SET @@global.log_slow_admin_statements= @org_log_slow_admin_statements;
 DROP PROCEDURE show_slow_log;
-DROP PROCEDURE show_slow_log_exclude_ps;

mysql-test/t/log_slow_debug.test

@@ -19,14 +19,6 @@ BEGIN
      WHERE sql_text NOT LIKE '%debug_dbug%';
 END
 $$
-CREATE PROCEDURE show_slow_log_exclude_ps()
-BEGIN
-  SELECT CONCAT('[slow] ', sql_text) AS sql_text
-    FROM mysql.slow_log
-     WHERE sql_text NOT LIKE '%debug_dbug%'
-       AND sql_text NOT IN ('Prepare','Close stmt');
-END
-$$
 DELIMITER ;$$
 
 
@@ -50,7 +42,7 @@ PREPARE stmt FROM 'ALTER TABLE t4 MODIFY a INT DEFAULT 1';
 EXECUTE stmt;
 DEALLOCATE PREPARE stmt;
 DROP TABLE t4;
-CALL show_slow_log_exclude_ps();
+CALL show_slow_log();
 
 
 --echo #
@@ -119,7 +111,7 @@ PREPARE stmt FROM 'ALTER TABLE t4 MODIFY a INT DEFAULT 1';
 EXECUTE stmt;
 DEALLOCATE PREPARE stmt;
 DROP TABLE t4;
-CALL show_slow_log_exclude_ps();
+CALL show_slow_log();
 
 
 --echo #
@@ -132,4 +124,3 @@ SET @@global.slow_query_log= @org_slow_query_log;
 SET @@global.log_output= @org_log_output;
 SET @@global.log_slow_admin_statements= @org_log_slow_admin_statements;
 DROP PROCEDURE show_slow_log;
-DROP PROCEDURE show_slow_log_exclude_ps;

sql/sql_parse.cc

@@ -2048,8 +2048,11 @@ void log_slow_statement(THD *thd)
   if (!thd->enable_slow_log)
     goto end; // E.g. SP statement
 
-  DBUG_EXECUTE_IF("simulate_slow_query",
-                  thd->server_status|= SERVER_QUERY_WAS_SLOW;);
+  DBUG_EXECUTE_IF("simulate_slow_query", {
+                  if (thd->get_command() == COM_QUERY ||
+                      thd->get_command() == COM_STMT_EXECUTE)
+                    thd->server_status|= SERVER_QUERY_WAS_SLOW;
+                  });
 
   if (((thd->server_status & SERVER_QUERY_WAS_SLOW) ||
        ((thd->server_status &