Fixed BUG #14614: Replication of tables with trigger generates

 error message if database is changed.


mysql-test/r/rpl_trigger.result:
  Fixed results for the added test cases
mysql-test/t/rpl_trigger.test:
  Added test cases for bug #14614
sql/sql_db.cc:
  Fixed bug #14614.
   Modified mysql_change_db(): The memory where db name resides
   is freed by a slave thread.

mysql-test/r/rpl_trigger.result

@@ -122,3 +122,15 @@ a=b && a=c
 1
 drop function bug12480;
 drop table t1;
+create table t1 (i int);
+create table t2 (i int);
+create trigger tr1 before insert on t1 for each row
+begin
+insert into t2 values (1);
+end|
+create database other;
+use other;
+insert into test.t1 values (1);
+use test;
+drop table t1,t2;
+drop database other;

mysql-test/t/rpl_trigger.test

@@ -133,6 +133,35 @@ select a=b && a=c from t1;
 drop function bug12480;
 drop table t1;
 
+#
+# #14614: Replication of tables with trigger generates error message if databases is changed
+# Note. The error message is emitted by _myfree() using fprintf() to the stderr
+# and because of that does not fall into the .result file.
+#
+
+create table t1 (i int);
+create table t2 (i int);
+
+delimiter |;
+create trigger tr1 before insert on t1 for each row
+begin
+ insert into t2 values (1);
+end|
+delimiter ;|
+
+create database other;
+use other;
+insert into test.t1 values (1);
+
+save_master_pos;
+connection slave;
+sync_with_master;
+
+connection master;
+use test;
+drop table t1,t2;
+drop database other;
+
 #
 # End of test
 #

sql/sql_db.cc

@@ -1162,10 +1162,12 @@ bool mysql_change_db(THD *thd, const char *name, bool no_access_check)
     DBUG_RETURN(1);
   }
 end:
-  x_free(thd->db);
+  if (!(thd->slave_thread))
+    x_free(thd->db);
   if (dbname && dbname[0] == 0)
   {
-    x_free(dbname);
+    if (!(thd->slave_thread))
+      x_free(dbname);
     thd->db= NULL;
     thd->db_length= 0;
   }