Fixed a failure in partition_truncate.test.

mysql-test/r/partition_truncate.result

@@ -5,7 +5,7 @@ partition by list (a)
 alter table t1 truncate partition p1,p1;
 ERROR HY000: Incorrect partition name
 alter table t1 truncate partition p0;
-ERROR HY000: Incorrect partition name
+ERROR HY000: Unknown partition 'p0' in table 't1'
 drop table t1;
 create table t1 (a int)
 partition by list (a)

mysql-test/t/partition_truncate.test

@@ -11,7 +11,7 @@ partition by list (a)
 (partition p1 values in (0));
 --error ER_WRONG_PARTITION_NAME
 alter table t1 truncate partition p1,p1;
---error ER_WRONG_PARTITION_NAME
+--error ER_UNKNOWN_PARTITION
 alter table t1 truncate partition p0;
 drop table t1;
 

sql/partition_info.cc

@@ -110,7 +110,7 @@ bool partition_info::add_named_partition(const char *part_name,
                                             length);
   if (!part_def)
   {
-//  my_error(ER_UNKNOWN_PARTITION, MYF(0), part_name, table->alias);
+    my_error(ER_UNKNOWN_PARTITION, MYF(0), part_name, table->alias.c_ptr());
     DBUG_RETURN(true);
   }