BUG#28086 (SBR of USER() becomes corrupted on slave):

Marking statements containing USER() or CURRENT_USER() as unsafe, causing
them to switch to using row-based logging in MIXED mode and generate a
warning in STATEMENT mode.

mysql-test/suite/rpl/r/rpl_switch_stm_row_mixed.result

@@ -405,6 +405,26 @@ CREATE TABLE t12 (data LONG);
 LOCK TABLES t12 WRITE;
 INSERT INTO t12 VALUES(UUID());
 UNLOCK TABLES;
+CREATE FUNCTION my_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT USER() INTO user;
+RETURN user;
+END $$
+CREATE FUNCTION my_current_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT CURRENT_USER() INTO user;
+RETURN user;
+END $$
+DROP TABLE IF EXISTS t13;
+CREATE TABLE t13 (data CHAR(64));
+INSERT INTO t13 VALUES (USER());
+INSERT INTO t13 VALUES (my_user());
+INSERT INTO t13 VALUES (CURRENT_USER());
+INSERT INTO t13 VALUES (my_current_user());
 show binlog events from <binlog_start>;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 master-bin.000001	#	Query	#	#	drop database if exists mysqltest1
@@ -709,6 +729,30 @@ master-bin.000001	#	Query	#	#	use `mysqltest1`; DROP TABLE IF EXISTS t12
 master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE TABLE t12 (data LONG)
 master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t12)
 master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE DEFINER=`root`@`localhost` FUNCTION my_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT USER() INTO user;
+RETURN user;
+END
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE DEFINER=`root`@`localhost` FUNCTION my_current_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT CURRENT_USER() INTO user;
+RETURN user;
+END
+master-bin.000001	#	Query	#	#	use `mysqltest1`; DROP TABLE IF EXISTS t13
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE TABLE t13 (data CHAR(64))
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 show binlog events from <binlog_start>;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 master-bin.000001	#	Query	#	#	drop database if exists mysqltest1
@@ -1013,5 +1057,29 @@ master-bin.000001	#	Query	#	#	use `mysqltest1`; DROP TABLE IF EXISTS t12
 master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE TABLE t12 (data LONG)
 master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t12)
 master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE DEFINER=`root`@`localhost` FUNCTION my_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT USER() INTO user;
+RETURN user;
+END
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE DEFINER=`root`@`localhost` FUNCTION my_current_user()
+RETURNS CHAR(64)
+BEGIN
+DECLARE user CHAR(64);
+SELECT CURRENT_USER() INTO user;
+RETURN user;
+END
+master-bin.000001	#	Query	#	#	use `mysqltest1`; DROP TABLE IF EXISTS t13
+master-bin.000001	#	Query	#	#	use `mysqltest1`; CREATE TABLE t13 (data CHAR(64))
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
+master-bin.000001	#	Table_map	#	#	table_id: # (mysqltest1.t13)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 drop database mysqltest1;
 set global binlog_format =@my_binlog_format;

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

@@ -518,6 +518,42 @@ CREATE TABLE t12 (data LONG);
 LOCK TABLES t12 WRITE;
 INSERT INTO t12 VALUES(UUID());
 UNLOCK TABLES;
+sync_slave_with_master;
+
+#
+# BUG#28086: SBR of USER() becomes corrupted on slave
+# 
+
+connection master;
+
+# Just to get something that is non-trivial, albeit still simple, we
+# stuff the result of USER() and CURRENT_USER() into a variable.
+--delimiter $$
+CREATE FUNCTION my_user()
+    RETURNS CHAR(64)
+BEGIN
+  DECLARE user CHAR(64);
+  SELECT USER() INTO user;
+  RETURN user;
+END $$
+--delimiter ;
+
+--delimiter $$
+CREATE FUNCTION my_current_user()
+    RETURNS CHAR(64)
+BEGIN
+  DECLARE user CHAR(64);
+  SELECT CURRENT_USER() INTO user;
+  RETURN user;
+END $$
+--delimiter ;
+
+DROP TABLE IF EXISTS t13;
+CREATE TABLE t13 (data CHAR(64));
+INSERT INTO t13 VALUES (USER());
+INSERT INTO t13 VALUES (my_user());
+INSERT INTO t13 VALUES (CURRENT_USER());
+INSERT INTO t13 VALUES (my_current_user());
 
 source include/show_binlog_events.inc;
 sync_slave_with_master;

sql/sql_yacc.yy

@@ -6745,6 +6745,7 @@ function_call_keyword:
         | CURRENT_USER optional_braces
           {
             $$= new (YYTHD->mem_root) Item_func_current_user(Lex->current_context());
+            Lex->set_stmt_unsafe();
             Lex->safe_to_cache_query= 0;
           }
         | DATE_SYM '(' expr ')'
@@ -6790,6 +6791,7 @@ function_call_keyword:
         | USER '(' ')'
           {
             $$= new (YYTHD->mem_root) Item_func_user();
+            Lex->set_stmt_unsafe();
             Lex->safe_to_cache_query=0;
           }
         | YEAR_SYM '(' expr ')'