MDEV-24208 SHOW RELAYLOG EVENTS command is not supported in the prepared statement protocol yet

Added sending of metadata in response to preparing request for
the commands SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_RELAYLOG_EVENTS

mysql-test/r/ps_show_log.result

+#
+# MDEV-24208 SHOW RELAYLOG EVENTS command is not supported in the prepared
+#            statement protocol yet
+#
+CREATE USER u1;
+include/master-slave.inc
+[connection master]
+connection master;
+CREATE TABLE t1(n INT);
+DROP TABLE t1;
+connection slave;
+PREPARE stmt_1 FROM 'SHOW BINLOG EVENTS';
+EXECUTE stmt_1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+#	#	Format_desc	#	#	#
+#	#	Gtid_list	#	#	[]
+#	#	Binlog_checkpoint	#	#	#
+#	#	Gtid	#	#	GTID 0-1-1
+#	#	Query	#	#	use `test`; CREATE TABLE t1(n INT)
+#	#	Gtid	#	#	GTID 0-1-2
+#	#	Query	#	#	use `test`; DROP TABLE IF EXISTS `t1` /* generated by server */
+# Execute the same prepared statement the second time to check that
+# no internal structures used for handling the statement
+# 'SHOW BINLOG EVENTS' were damaged.
+EXECUTE stmt_1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+#	#	Format_desc	#	#	#
+#	#	Gtid_list	#	#	[]
+#	#	Binlog_checkpoint	#	#	#
+#	#	Gtid	#	#	GTID 0-1-1
+#	#	Query	#	#	use `test`; CREATE TABLE t1(n INT)
+#	#	Gtid	#	#	GTID 0-1-2
+#	#	Query	#	#	use `test`; DROP TABLE IF EXISTS `t1` /* generated by server */
+DEALLOCATE PREPARE stmt_1;
+connection slave;
+PREPARE stmt_1 FROM 'SHOW RELAYLOG EVENTS';
+EXECUTE stmt_1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+slave-relay-bin.000001	#	Format_desc	#	#	#
+slave-relay-bin.000001	#	Rotate	#	#	#
+# Execute the same prepared statement the second time to check that
+# no internal structures used for handling the statement
+# 'SHOW RELAYLOG EVENTS' were damaged.
+EXECUTE stmt_1;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+slave-relay-bin.000001	#	Format_desc	#	#	#
+slave-relay-bin.000001	#	Rotate	#	#	#
+DEALLOCATE PREPARE stmt_1;
+# Create the user u1 without the REPLICATION SLAVE privilege required
+# for running the statements SHOW BINLOG EVENTS/SHOW RELAYLOG EVENTS
+# and check that attempt to execute the statements SHOW BINLOG EVENTS/
+# SHOW RELAYLOG EVENTS as a prepred statements by a user without required
+# privileges results in error.
+connect  con2,localhost,u1,,test;
+PREPARE stmt_1 FROM 'SHOW BINLOG EVENTS';
+EXECUTE stmt_1;
+ERROR 42000: Access denied; you need (at least one of) the REPLICATION SLAVE privilege(s) for this operation
+PREPARE stmt_1 FROM 'SHOW RELAYLOG EVENTS';
+EXECUTE stmt_1;
+ERROR 42000: Access denied; you need (at least one of) the REPLICATION SLAVE privilege(s) for this operation
+DEALLOCATE PREPARE stmt_1;
+include/rpl_end.inc
+connection default;
+DROP USER u1;
+# End of 10.2 tests

mysql-test/suite/rpl/t/rpl_row_create_table.test

@@ -7,11 +7,6 @@ connection slave;
 --source include/have_innodb.inc
 connection master;
 
-# Bug#18326: Do not lock table for writing during prepare of statement
-# The use of the ps protocol causes extra table maps in the binlog, so
-# we disable the ps-protocol for this statement.
---disable_ps_protocol
-
 # Set the default storage engine to different values on master and
 # slave. We need to stop the slave for the server variable to take
 # effect, since the variable is only read on start-up.

mysql-test/suite/rpl/t/rpl_row_flsh_tbls.test

@@ -4,10 +4,4 @@
 
 let $rename_event_pos= `select @binlog_start_pos + 819`;
 
-# Bug#18326: Do not lock table for writing during prepare of statement
-# The use of the ps protocol causes extra table maps in the binlog, so
-# we disable the ps-protocol for this statement.
-
---disable_ps_protocol
 -- source extra/rpl_tests/rpl_flsh_tbls.test
---enable_ps_protocol

mysql-test/t/ps_show_log.test

+--echo #
+--echo # MDEV-24208 SHOW RELAYLOG EVENTS command is not supported in the prepared
+--echo #            statement protocol yet
+--echo #
+
+CREATE USER u1;
+
+--source include/have_binlog_format_statement.inc
+--source include/master-slave.inc
+--connection master
+CREATE TABLE t1(n INT);
+
+DROP TABLE t1;
+
+--sync_slave_with_master
+PREPARE stmt_1 FROM 'SHOW BINLOG EVENTS';
+
+--replace_column 2 # 4 # 5 #
+--replace_regex /Server ver:.*Binlog ver: .*/#/ /slave-bin.*/#/
+EXECUTE stmt_1;
+
+--echo # Execute the same prepared statement the second time to check that
+--echo # no internal structures used for handling the statement
+--echo # 'SHOW BINLOG EVENTS' were damaged.
+
+--replace_column 2 # 4 # 5 #
+--replace_regex /Server ver:.*Binlog ver: .*/#/ /slave-bin.*/#/
+EXECUTE stmt_1;
+
+DEALLOCATE PREPARE stmt_1;
+
+--connection slave
+PREPARE stmt_1 FROM 'SHOW RELAYLOG EVENTS';
+--replace_column 2 # 4 # 5 #
+--replace_regex /Server ver:.*Binlog ver: .*/#/ /slave-relay-bin.*;pos=.*/#/
+EXECUTE stmt_1;
+
+--echo # Execute the same prepared statement the second time to check that
+--echo # no internal structures used for handling the statement
+--echo # 'SHOW RELAYLOG EVENTS' were damaged.
+
+--replace_column 2 # 4 # 5 #
+--replace_regex /Server ver:.*Binlog ver: .*/#/ /slave-relay-bin.*;pos=.*/#/
+EXECUTE stmt_1;
+
+DEALLOCATE PREPARE stmt_1;
+
+--echo # Create the user u1 without the REPLICATION SLAVE privilege required
+--echo # for running the statements SHOW BINLOG EVENTS/SHOW RELAYLOG EVENTS
+--echo # and check that attempt to execute the statements SHOW BINLOG EVENTS/
+--echo # SHOW RELAYLOG EVENTS as a prepred statements by a user without required
+--echo # privileges results in error.
+
+--connect (con2,localhost,u1,,test)
+PREPARE stmt_1 FROM 'SHOW BINLOG EVENTS';
+
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+EXECUTE stmt_1;
+
+PREPARE stmt_1 FROM 'SHOW RELAYLOG EVENTS';
+
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+EXECUTE stmt_1;
+
+DEALLOCATE PREPARE stmt_1;
+
+--source include/rpl_end.inc
+
+--connection default
+# Clean up
+DROP USER u1;
+
+--echo # End of 10.2 tests

sql/sql_prepare.cc

@@ -121,6 +121,7 @@ When one supplies long data for a placeholder:
 static const uint PARAMETER_FLAG_UNSIGNED= 128U << 8;
 #endif
 #include "lock.h"                               // MYSQL_OPEN_FORCE_SHARED_MDL
+#include "log_event.h"                          // class Log_event
 #include "sql_handler.h"
 #include "transaction.h"                        // trans_rollback_implicit
 #include "wsrep_mysqld.h"
@@ -2521,6 +2522,16 @@ static bool check_prepared_statement(Prepared_statement *stmt)
       DBUG_RETURN(FALSE);
     }
     break;
+  case SQLCOM_SHOW_BINLOG_EVENTS:
+  case SQLCOM_SHOW_RELAYLOG_EVENTS:
+    {
+      List<Item> field_list;
+      Log_event::init_show_field_list(thd, &field_list);
+
+      if ((res= send_stmt_metadata(thd, stmt, &field_list)) == 2)
+        DBUG_RETURN(FALSE);
+    }
+  break;
 #endif /* EMBEDDED_LIBRARY */
   case SQLCOM_SHOW_CREATE_PROC:
     if ((res= mysql_test_show_create_routine(stmt, TYPE_ENUM_PROCEDURE)) == 2)