ALTER add default history partitions name clash on non-default partitions

--source include/have_partition.inc

--source include/have_innodb.inc

create or replace table t1 (x int) with system versioning partition by system_time

(partition p2 history, partition p3 history, partition pn current);

alter table t1 add partition partitions 1;

alter table t1 add partition partitions 1;

alter table t1 add partition partitions 1;

show create table t1;

drop tables t1;

mysqltest: At line 6: query 'alter table t1 add partition partitions 1' failed: 1517: Duplicate partition name p2