Bug #50914 mysqlbinlog not handling drop of current default database

mysqlbinlog only prints "use $database" statements to its output stream
when the active default database changes between events. This will cause
"No Database Selected" error when dropping and recreating that database.

To fix the problem, we clear print_event_info->db when printing an event
of CREATE/DROP/ALTER database statements, so that the Query_log_event
after such statements will be printed with the use 'db' anyway except
transaction keywords.

mysql-test/r/mysqlbinlog.result:
  Test result for Bug#50914.
mysql-test/t/mysqlbinlog.test:
  Added test to verify if the approach of the mysqlbinlog prints
  "use $database" statements to its output stream will cause
  "No Database Selected" error when dropping and recreating
  that database.
sql/log_event.cc:
  Updated code to clear print_event_info->db when printing an event
  of CREATE/DROP/ALTER database statements, so that the Query_log_event
  after such statements will be printed with the use 'db' anyway except
  transaction keywords.

1 files changed, 27 insertions, 0 deletions

diff --git a/mysql-test/t/mysqlbinlog.test b/mysql-test/t/mysqlbinlog.test
index 783708cc3b2..d5dd3052269 100644
--- a/mysql-test/t/mysqlbinlog.test
+++ b/mysql-test/t/mysqlbinlog.test
@@ -474,3 +474,30 @@ diff_files $MYSQLTEST_VARDIR/tmp/mysqlbinlog.warn $MYSQLTEST_VARDIR/tmp/mysqlbin
 # Cleanup for this part of test
 remove_file $MYSQLTEST_VARDIR/tmp/mysqlbinlog.warn.empty;
 remove_file $MYSQLTEST_VARDIR/tmp/mysqlbinlog.warn;
+
+#
+# BUG#50914
+# This test verifies if the approach of the mysqlbinlog prints
+# "use $database" statements to its output stream will cause
+# "No Database Selected" error when dropping and recreating
+# that database.
+#
+RESET MASTER;
+CREATE DATABASE test1;
+USE test1;
+CREATE TABLE t1(id int);
+DROP DATABASE test1;
+CREATE DATABASE test1;
+USE test1;
+CREATE TABLE t1(id int);
+DROP TABLE t1;
+DROP DATABASE test1;
+let $master_binlog= query_get_value(SHOW MASTER STATUS, File, 1);
+FLUSH LOGS;
+
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+exec $MYSQL_BINLOG $MYSQLD_DATADIR/$master_binlog | $MYSQL test 2>&1;
+
+let $binlog_file= query_get_value(SHOW MASTER STATUS, File, 1);
+source include/show_binlog_events.inc;
+