MBug#702303: Spurious `use` statements in output from mysqlbinlog --rewrite-db="a->b"

client/mysqlbinlog.cc

@@ -636,11 +636,16 @@ static bool shall_skip_database(const char *log_dbname)
   producing USE statements by corresponding log event print-functions.
 */
 
-void print_use_stmt(PRINT_EVENT_INFO* pinfo, const char* db, size_t db_len)
+static void
+print_use_stmt(PRINT_EVENT_INFO* pinfo, const Query_log_event *ev)
 {
+  const char* db= ev->db;
+  const size_t db_len= ev->db_len;
+
   // pinfo->db is the current db.
   // If current db is the same as required db, do nothing.
-  if (!db || !memcmp(pinfo->db, db, db_len + 1))
+  if ((ev->flags & LOG_EVENT_SUPPRESS_USE_F) || !db ||
+      !memcmp(pinfo->db, db, db_len + 1))
     return;
 
   // Current db and required db are different.
@@ -779,7 +784,7 @@ Exit_status process_event(PRINT_EVENT_INFO *print_event_info, Log_event *ev,
       Query_log_event *qe= (Query_log_event*)ev;
       if (!qe->is_trans_keyword() && shall_skip_database(qe->db))
         goto end;
-      print_use_stmt(print_event_info, qe->db, qe->db_len);
+      print_use_stmt(print_event_info, qe);
       if (opt_base64_output_mode == BASE64_OUTPUT_ALWAYS)
       {
         if ((retval= write_event_header_and_base64(ev, result_file,
@@ -912,7 +917,7 @@ Exit_status process_event(PRINT_EVENT_INFO *print_event_info, Log_event *ev,
 
       if (!shall_skip_database(exlq->db))
       {
-        print_use_stmt(print_event_info, exlq->db, exlq->db_len);
+        print_use_stmt(print_event_info, exlq);
         if (fname)
         {
           convert_path_to_forward_slashes(fname);
@@ -1491,7 +1496,7 @@ static int parse_args(int *argc, char*** argv)
 */
 static Exit_status safe_connect()
 {
-  /* Close and old connections to MySQL */
+  /* Close any old connections to MySQL */
   if (mysql)
     mysql_close(mysql);
 

mysql-test/r/mysqlbinlog-innodb.result

+SET TIMESTAMP=1000000000;
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+CREATE DATABASE test2;
+RESET MASTER;
+USE test2;
+BEGIN;
+USE test;
+INSERT INTO t1 VALUES (1);
+USE test2;
+COMMIT;
+BEGIN;
+USE test;
+INSERT INTO t1 VALUES (2);
+USE test2;
+COMMIT;
+USE test;
+SELECT * FROM t1 ORDER BY a;
+a
+1
+2
+FLUSH LOGS;
+/*!40019 SET @@session.max_insert_delayed_threads=0*/;
+/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
+DELIMITER /*!*/;
+ROLLBACK/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+SET @@session.pseudo_thread_id=999999999/*!*/;
+SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
+SET @@session.sql_mode=0/*!*/;
+SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
+/*!\C latin1 *//*!*/;
+SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8/*!*/;
+SET @@session.lc_time_names=0/*!*/;
+SET @@session.collation_database=DEFAULT/*!*/;
+BEGIN
+/*!*/;
+use test/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+INSERT INTO t1 VALUES (1)
+/*!*/;
+COMMIT/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+BEGIN
+/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+INSERT INTO t1 VALUES (2)
+/*!*/;
+COMMIT/*!*/;
+DELIMITER ;
+# End of log file
+ROLLBACK /* added by mysqlbinlog */;
+/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
+/*!40019 SET @@session.max_insert_delayed_threads=0*/;
+/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
+DELIMITER /*!*/;
+ROLLBACK/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+SET @@session.pseudo_thread_id=999999999/*!*/;
+SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
+SET @@session.sql_mode=0/*!*/;
+SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
+/*!\C latin1 *//*!*/;
+SET @@session.character_set_client=8,@@session.collation_connection=8,@@session.collation_server=8/*!*/;
+SET @@session.lc_time_names=0/*!*/;
+SET @@session.collation_database=DEFAULT/*!*/;
+BEGIN
+/*!*/;
+use foo/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+INSERT INTO t1 VALUES (1)
+/*!*/;
+COMMIT/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+BEGIN
+/*!*/;
+SET TIMESTAMP=1000000000/*!*/;
+INSERT INTO t1 VALUES (2)
+/*!*/;
+COMMIT/*!*/;
+DELIMITER ;
+# End of log file
+ROLLBACK /* added by mysqlbinlog */;
+/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
+DROP DATABASE test2;
+DROP TABLE t1;

mysql-test/suite/binlog/r/binlog_row_mysqlbinlog_options.result

@@ -159,7 +159,6 @@ SET TIMESTAMP=1000000000/*!*/;
 COMMIT
 /*!*/;
 # at #
-use new_test1/*!*/;
 #010909  4:46:40 server id #  end_log_pos # 	Query	thread_id=#	exec_time=#	error_code=0
 SET TIMESTAMP=1000000000/*!*/;
 BEGIN
@@ -354,7 +353,6 @@ SET TIMESTAMP=1000000000/*!*/;
 COMMIT
 /*!*/;
 # at #
-use new_test1/*!*/;
 #010909  4:46:40 server id #  end_log_pos # 	Query	thread_id=#	exec_time=#	error_code=0
 SET TIMESTAMP=1000000000/*!*/;
 BEGIN

mysql-test/t/mysqlbinlog-innodb.test

+-- source include/have_binlog_format_statement.inc
+-- source include/have_log_bin.inc
+-- source include/have_innodb.inc
+
+#
+# MBug#702303: Spurious `use` statements in output from mysqlbinlog --rewrite-db="a->b" 
+#
+let $MYSQLD_DATADIR= `select @@datadir`;
+SET TIMESTAMP=1000000000;
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb;
+CREATE DATABASE test2;
+
+RESET MASTER;
+USE test2;
+BEGIN;
+USE test;
+INSERT INTO t1 VALUES (1);
+USE test2;
+COMMIT;
+BEGIN;
+USE test;
+INSERT INTO t1 VALUES (2);
+USE test2;
+COMMIT;
+USE test;
+SELECT * FROM t1 ORDER BY a;
+FLUSH LOGS;
+--exec $MYSQL_BINLOG $MYSQLD_DATADIR/master-bin.000001 --short-form
+--exec $MYSQL_BINLOG $MYSQLD_DATADIR/master-bin.000001 --short-form --rewrite-db="test->foo" --rewrite-db="test2->bar"
+DROP DATABASE test2;
+DROP TABLE t1;