BUG#13684: SP: DROP PROCEDURE|FUNCTION IF EXISTS not binlogged if

routine does not exist 
      
There is an inconsistency with DROP DATABASE IF EXISTS, DROP TABLE IF
EXISTS and DROP VIEW IF EXISTS: those are binlogged even if the DB or
TABLE does not exist, whereas DROP PROCEDURE IF EXISTS does not. It
would be nice or at least consistent if DROP PROCEDURE/STATEMENT
worked the same too.
      
Fixed DROP PROCEDURE|FUNCTION IF EXISTS by adding a call to
mysql_bin_log.write in mysql_execute_command. Checked also if all 
documented "DROP (...) IF EXISTS" get binlogged.
      
NOTE: This is a 5.0 backport patch as requested by support.

mysql-test/r/rpl_drop_if_exists.result:
  Result file for test case added.
mysql-test/r/rpl_sp.result:
  Updated result file for existing test case that has now extra events in
  binary log (the ones from drop if exists procedure/function).
mysql-test/t/rpl_drop_if_exists.test:
  Added test case for asserting validity of proposed patch.
sql/sql_parse.cc:
  Added call mysql_bin_log.write when lex has drop_if_exists enabled for 
  stored procedures.

mysql-test/r/rpl_drop_if_exists.result

+RESET MASTER;
+DROP PROCEDURE IF EXISTS db_bug_13684.p;
+DROP FUNCTION IF EXISTS db_bug_13684.f;
+DROP TRIGGER IF EXISTS db_bug_13684.tr;
+DROP VIEW IF EXISTS db_bug_13684.v;
+DROP TABLE IF EXISTS db_bug_13684.t;
+DROP DATABASE IF EXISTS db_bug_13684;
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	#	#	use `test`; DROP PROCEDURE IF EXISTS db_bug_13684.p
+master-bin.000001	#	Query	#	#	use `test`; DROP FUNCTION IF EXISTS db_bug_13684.f
+master-bin.000001	#	Query	#	#	use `test`; DROP TRIGGER IF EXISTS db_bug_13684.tr
+master-bin.000001	#	Query	#	#	use `test`; DROP VIEW IF EXISTS db_bug_13684.v
+master-bin.000001	#	Query	#	#	use `test`; DROP TABLE IF EXISTS db_bug_13684.t
+master-bin.000001	#	Query	#	#	DROP DATABASE IF EXISTS db_bug_13684
+CREATE DATABASE db_bug_13684;
+CREATE TABLE db_bug_13684.t (a int);
+CREATE VIEW db_bug_13684.v 
+AS SELECT * FROM db_bug_13684.t;
+CREATE TRIGGER db_bug_13684.tr BEFORE INSERT ON db_bug_13684.t
+FOR EACH ROW BEGIN
+END;
+CREATE PROCEDURE db_bug_13684.p (OUT p1 INT)
+BEGIN
+END;
+CREATE FUNCTION db_bug_13684.f (s CHAR(20))
+RETURNS CHAR(50) DETERMINISTIC
+RETURN s;
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	#	#	use `test`; DROP PROCEDURE IF EXISTS db_bug_13684.p
+master-bin.000001	#	Query	#	#	use `test`; DROP FUNCTION IF EXISTS db_bug_13684.f
+master-bin.000001	#	Query	#	#	use `test`; DROP TRIGGER IF EXISTS db_bug_13684.tr
+master-bin.000001	#	Query	#	#	use `test`; DROP VIEW IF EXISTS db_bug_13684.v
+master-bin.000001	#	Query	#	#	use `test`; DROP TABLE IF EXISTS db_bug_13684.t
+master-bin.000001	#	Query	#	#	DROP DATABASE IF EXISTS db_bug_13684
+master-bin.000001	#	Query	#	#	CREATE DATABASE db_bug_13684
+master-bin.000001	#	Query	#	#	use `test`; CREATE TABLE db_bug_13684.t (a int)
+master-bin.000001	#	Query	#	#	use `test`; CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `db_bug_13684`.`v` AS select `db_bug_13684`.`t`.`a` AS `a` from `db_bug_13684`.`t`
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` TRIGGER db_bug_13684.tr BEFORE INSERT ON db_bug_13684.t
+FOR EACH ROW BEGIN
+END
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` PROCEDURE `db_bug_13684`.`p`(OUT p1 INT)
+BEGIN
+END
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` FUNCTION `db_bug_13684`.`f`(s CHAR(20)) RETURNS char(50) CHARSET latin1
+    DETERMINISTIC
+RETURN s
+DROP PROCEDURE IF EXISTS db_bug_13684.p;
+DROP FUNCTION IF EXISTS db_bug_13684.f;
+DROP TRIGGER IF EXISTS db_bug_13684.tr;
+DROP VIEW IF EXISTS db_bug_13684.v;
+DROP TABLE IF EXISTS db_bug_13684.t;
+DROP DATABASE IF EXISTS db_bug_13684;
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	#	#	use `test`; DROP PROCEDURE IF EXISTS db_bug_13684.p
+master-bin.000001	#	Query	#	#	use `test`; DROP FUNCTION IF EXISTS db_bug_13684.f
+master-bin.000001	#	Query	#	#	use `test`; DROP TRIGGER IF EXISTS db_bug_13684.tr
+master-bin.000001	#	Query	#	#	use `test`; DROP VIEW IF EXISTS db_bug_13684.v
+master-bin.000001	#	Query	#	#	use `test`; DROP TABLE IF EXISTS db_bug_13684.t
+master-bin.000001	#	Query	#	#	DROP DATABASE IF EXISTS db_bug_13684
+master-bin.000001	#	Query	#	#	CREATE DATABASE db_bug_13684
+master-bin.000001	#	Query	#	#	use `test`; CREATE TABLE db_bug_13684.t (a int)
+master-bin.000001	#	Query	#	#	use `test`; CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `db_bug_13684`.`v` AS select `db_bug_13684`.`t`.`a` AS `a` from `db_bug_13684`.`t`
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` TRIGGER db_bug_13684.tr BEFORE INSERT ON db_bug_13684.t
+FOR EACH ROW BEGIN
+END
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` PROCEDURE `db_bug_13684`.`p`(OUT p1 INT)
+BEGIN
+END
+master-bin.000001	#	Query	#	#	use `test`; CREATE DEFINER=`root`@`localhost` FUNCTION `db_bug_13684`.`f`(s CHAR(20)) RETURNS char(50) CHARSET latin1
+    DETERMINISTIC
+RETURN s
+master-bin.000001	#	Query	#	#	use `test`; DROP PROCEDURE IF EXISTS db_bug_13684.p
+master-bin.000001	#	Query	#	#	use `test`; DROP FUNCTION IF EXISTS db_bug_13684.f
+master-bin.000001	#	Query	#	#	use `test`; DROP TRIGGER IF EXISTS db_bug_13684.tr
+master-bin.000001	#	Query	#	#	use `test`; DROP VIEW IF EXISTS db_bug_13684.v
+master-bin.000001	#	Query	#	#	use `test`; DROP TABLE IF EXISTS db_bug_13684.t
+master-bin.000001	#	Query	#	#	DROP DATABASE IF EXISTS db_bug_13684

mysql-test/r/rpl_sp.result

@@ -483,6 +483,7 @@ master-bin.000001	#	Query	1	#	use `mysqltest1`; drop procedure foo
 master-bin.000001	#	Query	1	#	use `mysqltest1`; drop function fn1
 master-bin.000001	#	Query	1	#	drop database mysqltest1
 master-bin.000001	#	Query	1	#	drop user "zedjzlcsjhd"@127.0.0.1
+master-bin.000001	#	Query	1	#	use `test`; drop function if exists f1
 master-bin.000001	#	Query	1	#	use `test`; CREATE DEFINER=`root`@`localhost` FUNCTION `f1`() RETURNS int(11)
     READS SQL DATA
 begin
@@ -498,12 +499,15 @@ master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int)
 master-bin.000001	#	Query	1	#	use `test`; insert into t1 (a) values (f1())
 master-bin.000001	#	Query	1	#	use `test`; drop view v1
 master-bin.000001	#	Query	1	#	use `test`; drop function f1
+master-bin.000001	#	Query	1	#	use `test`; DROP PROCEDURE IF EXISTS p1
 master-bin.000001	#	Query	1	#	use `test`; DROP TABLE IF EXISTS t1
 master-bin.000001	#	Query	1	#	use `test`; CREATE TABLE t1(col VARCHAR(10))
 master-bin.000001	#	Query	1	#	use `test`; CREATE DEFINER=`root`@`localhost` PROCEDURE `p1`(arg VARCHAR(10))
 INSERT INTO t1 VALUES(arg)
 master-bin.000001	#	Query	1	#	use `test`; INSERT INTO t1 VALUES( NAME_CONST('arg',_latin1'test' COLLATE 'latin1_swedish_ci'))
 master-bin.000001	#	Query	1	#	use `test`; DROP PROCEDURE p1
+master-bin.000001	#	Query	1	#	use `test`; DROP PROCEDURE IF EXISTS p1
+master-bin.000001	#	Query	1	#	use `test`; DROP FUNCTION IF EXISTS f1
 master-bin.000001	#	Query	1	#	use `test`; CREATE DEFINER=`root`@`localhost` PROCEDURE `p1`()
 SET @a = 1
 master-bin.000001	#	Query	1	#	use `test`; CREATE DEFINER=`root`@`localhost` FUNCTION `f1`() RETURNS int(11)
@@ -804,6 +808,9 @@ drop user "zedjzlcsjhd"@127.0.0.1
 /*!*/;
 use test/*!*/;
 SET TIMESTAMP=t/*!*/;
+drop function if exists f1
+/*!*/;
+SET TIMESTAMP=t/*!*/;
 CREATE DEFINER=`root`@`localhost` FUNCTION `f1`() RETURNS int(11)
     READS SQL DATA
 begin
@@ -831,6 +838,9 @@ SET TIMESTAMP=t/*!*/;
 drop function f1
 /*!*/;
 SET TIMESTAMP=t/*!*/;
+DROP PROCEDURE IF EXISTS p1
+/*!*/;
+SET TIMESTAMP=t/*!*/;
 DROP TABLE IF EXISTS t1
 /*!*/;
 SET TIMESTAMP=t/*!*/;
@@ -847,6 +857,12 @@ SET TIMESTAMP=t/*!*/;
 DROP PROCEDURE p1
 /*!*/;
 SET TIMESTAMP=t/*!*/;
+DROP PROCEDURE IF EXISTS p1
+/*!*/;
+SET TIMESTAMP=t/*!*/;
+DROP FUNCTION IF EXISTS f1
+/*!*/;
+SET TIMESTAMP=t/*!*/;
 CREATE DEFINER=`root`@`localhost` PROCEDURE `p1`()
 SET @a = 1
 /*!*/;

mysql-test/t/rpl_drop_if_exists.test

+# BUG#13684: 
+#   SP: DROP PROCEDURE|FUNCTION IF EXISTS not binlogged if routine 
+#   does not exist
+#   
+#   There is an inconsistency with DROP DATABASE IF EXISTS, DROP
+#   TABLE IF EXISTS and DROP VIEW IF EXISTS: those are binlogged even
+#   if the DB or TABLE does not exist, whereas DROP PROCEDURE IF
+#   EXISTS does not. It would be nice or at least consistent if DROP
+#   PROCEDURE/STATEMENT worked the same too.
+#
+# Description: 
+#   DROP PROCEDURE|FUNCTION IF EXISTS does not get binlogged whereas DROP
+#   DATABASE|TABLE|TRIGGER|... IF EXISTS do.
+#
+#   Fixed DROP PROCEDURE|FUNCTION IF EXISTS by adding a call to
+#   mysql_bin_log.write in mysql_execute_command. Checked also if all
+#   documented "DROP (...) IF EXISTS" get binlogged. 
+#
+#   Test is implemented as follows:
+#
+#       i) test each "drop if exists" (DDL)
+#      ii) show binlog events;
+#     iii) create an object for each drop if exists statement;
+#      iv) issue "drop if exists" in existent objects.
+#       v) show binlog events;
+#
+
+--source include/have_log_bin.inc
+RESET MASTER;
+
+disable_warnings;
+
+# test all "drop if exists" in manual with inexistent objects
+DROP PROCEDURE IF EXISTS db_bug_13684.p;
+DROP FUNCTION IF EXISTS db_bug_13684.f;
+DROP TRIGGER IF EXISTS db_bug_13684.tr;
+DROP VIEW IF EXISTS db_bug_13684.v;
+DROP TABLE IF EXISTS db_bug_13684.t;
+DROP DATABASE IF EXISTS db_bug_13684;
+
+--source include/show_binlog_events.inc
+
+# test drop with existing values
+
+# create 
+CREATE DATABASE db_bug_13684;
+
+CREATE TABLE db_bug_13684.t (a int);
+
+CREATE VIEW db_bug_13684.v 
+  AS SELECT * FROM db_bug_13684.t;
+
+CREATE TRIGGER db_bug_13684.tr BEFORE INSERT ON db_bug_13684.t
+  FOR EACH ROW BEGIN
+  END;
+
+CREATE PROCEDURE db_bug_13684.p (OUT p1 INT)
+  BEGIN
+  END;
+
+CREATE FUNCTION db_bug_13684.f (s CHAR(20))
+  RETURNS CHAR(50) DETERMINISTIC
+  RETURN s;
+
+--source include/show_binlog_events.inc
+
+# drop existing 
+DROP PROCEDURE IF EXISTS db_bug_13684.p;
+DROP FUNCTION IF EXISTS db_bug_13684.f;
+DROP TRIGGER IF EXISTS db_bug_13684.tr;
+DROP VIEW IF EXISTS db_bug_13684.v;
+DROP TABLE IF EXISTS db_bug_13684.t;
+DROP DATABASE IF EXISTS db_bug_13684;
+
+--source include/show_binlog_events.inc
+
+enable_warnings;

sql/sql_parse.cc

@@ -5067,6 +5067,14 @@ create_sp_error:
       case SP_KEY_NOT_FOUND:
 	if (lex->drop_if_exists)
 	{
+          if (mysql_bin_log.is_open())
+          {    
+            Query_log_event qinfo(thd, thd->query, thd->query_length, 
+                                  /* using_trans */ 0, 
+                                  /* suppress use */ FALSE,
+                                  THD::NOT_KILLED);
+            mysql_bin_log.write(&qinfo);
+          }    
 	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
 			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
 			      SP_COM_STRING(lex), lex->spname->m_name.str);