System versioning is incorrect in Spider

--source include/have_innodb.inc

--source include/have_partition.inc

install soname 'ha_spider';

set spider_same_server_link= on;

eval create server s foreign data wrapper mysql options 

(host '127.0.0.1', database 'test', user 'root', port $MASTER_MYPORT);

CREATE TABLE t2(

   x INT,

   y INT,

   row_start TIMESTAMP(6),

   row_end TIMESTAMP(6)

);

create or replace table t_sp1 (x int,y int)

engine=Spider COMMENT='wrapper "mysql", srv "s", table "t2"' 

with system versioning partition by system_time (

    PARTITION p0 HISTORY,

    PARTITION pn CURRENT

); 

insert into t_sp1 values (1,1),(2,2),(3,3),(4,4),(5,5);

delete from t_sp1 where x=1;

select * from t_sp1;

select * from t_sp1 partition (p0);

select partition_name, table_rows from information_schema.partitions where table_name = 't_sp1';

drop tables t2, t_sp1;

select * from t_sp1;

x	y

2	2

3	3

4	4

5	5

select * from t_sp1 partition (p0);

x	y

2	2

3	3

4	4

5	5

select partition_name, table_rows from information_schema.partitions where table_name = 't_sp1';

partition_name	table_rows

p0	2

pn	2

select * from t_sp1;

x	y

2	2

3	3

4	4

5	5

select * from t_sp1 partition (p0);

x	y

1	1

select partition_name, table_rows from information_schema.partitions where table_name = 't_sp1';

partition_name	table_rows

p0	1

pn	4