Bug#16878 dump of trigger

 - Pass "in_comment" variable on to new lex in sp_head::reset_lex
 - Add testcases for dumping and reloading trigger without BEGIN/END

mysql-test/r/mysqldump.result

@@ -2611,3 +2611,25 @@ UNLOCK TABLES;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
 drop table t1;
+create table t1 (a int, created datetime);
+create table t2 (b int, created datetime);
+create trigger tr1 before insert on t1 for each row set
+new.created=now();
+create trigger tr2 after insert on t1
+for each row
+begin
+insert into t2 set b=new.a and created=new.created;
+end|
+drop trigger tr1;
+drop trigger tr2;
+drop table t1, t2;
+show triggers;
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer
+tr1	INSERT	t1	set
+new.created=now()	BEFORE	#		root@localhost
+tr2	INSERT	t1	begin
+insert into t2 set b=new.a and created=new.created;
+end	AFTER	#		root@localhost
+drop trigger tr1;
+drop trigger tr2;
+drop table t1, t2;

mysql-test/t/mysqldump.test

@@ -1036,3 +1036,33 @@ insert into t1 values ('','');
 drop table t1;
 
 # End of 4.1 tests
+
+#
+# Bug #16878 dump of trigger
+#
+
+create table t1 (a int, created datetime);
+create table t2 (b int, created datetime);
+create trigger tr1 before insert on t1 for each row set
+new.created=now();
+delimiter |;
+create trigger tr2 after insert on t1
+for each row
+begin
+  insert into t2 set b=new.a and created=new.created;
+end|
+delimiter ;|
+
+# dump table and trigger
+--exec $MYSQL_DUMP test > var/tmp/bug16878.sql
+drop trigger tr1;
+drop trigger tr2;
+drop table t1, t2;
+
+# reload dump
+--exec $MYSQL test < var/tmp/bug16878.sql
+--replace_column 6 #
+show triggers;
+drop trigger tr1;
+drop trigger tr2;
+drop table t1, t2;

sql/sp_head.cc

@@ -1584,6 +1584,8 @@ sp_head::reset_lex(THD *thd)
   sublex->trg_table_fields.empty();
   sublex->sp_lex_in_use= FALSE;
 
+  sublex->in_comment= oldlex->in_comment;
+
   /* Reset type info. */
 
   sublex->charset= NULL;