FederatedX: error on multi-table UPDATE that uses a non-mergable VIEW

Issue:

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Multi table update stmt isn't pushed down when view created w/o limit.

Issue details:

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case1) With variable ON , multi table update stmt gets pushed down , since Remote server doesn't have view v1 ,it throws "v1 doesn't exists" error //Expected behaviour

case2) Same above case but View created w/o limit clause , multi table update succeds // Implies multi table update stmt hasn't pushed down to remote server engine , bug ??

case1)

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create federated table s1(a int);
insert into s1 values (1),(2),(3);

set global federated_pushdown=ON;
drop view if exists v1;
create view v1 as select * from s1 limit 2;
UPDATE s1 JOIN v1 SET s1.a = 1 where v1.a <3;
ERROR 1146 (42S02): Table 'm8.v1' doesn't exist

Remote server general log:
--------------------------
Query update (`m8`.`s1` join `m8`.`v1`) set `m8`.`s1`.`a` = 1 where `v1`.`a` < 3

MariaDB [m8]> explain UPDATE s1 JOIN v1 SET s1.a = 1 where v1.a <3;

+------+---------------+-------+------+---------------+------+---------+------+------+-------+

| id   | select_type   | table | type | possible_keys | key  | key_len | ref  | rows | Extra |

+------+---------------+-------+------+---------------+------+---------+------+------+-------+

|    1 | PUSHED UPDATE | NULL  | NULL | NULL          | NULL | NULL    | NULL | NULL | NULL  |

+------+---------------+-------+------+---------------+------+---------+------+------+-------+

case2)

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insert into s1 values (1),(2),(3);

set global federated_pushdown=ON;
drop view if exists v1;
create view v1 as select * from s1;
UPDATE s1 JOIN v1 SET s1.a = 1 where v1.a <3; //Succeeds

Remote server general log:
-------------------------
Query UPDATE `s1` SET `a` = 1 WHERE `a` = 2 LIMIT 1
Query UPDATE `s1` SET `a` = 1 WHERE `a` = 3 LIMIT 1

Series of update..LIMIT1 stmt , so it's confirmed ,stmt isn't pushed down to remote server.

MariaDB [m8]> explain UPDATE s1 JOIN v1 SET s1.a = 1 where v1.a <3;

+------+-------------+-------+------+---------------+------+---------+------+------+-------------+

| id   | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra       |

+------+-------------+-------+------+---------------+------+---------+------+------+-------------+

|    1 | SIMPLE      | s1    | ALL  | NULL          | NULL | NULL    | NULL | 3    |             |

|    1 | SIMPLE      | s1    | ALL  | NULL          | NULL | NULL    | NULL | 3    | Using where |

+------+-------------+-------+------+---------------+------+---------+------+------+-------------+

Version used:

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Branch : 13.2-MDEV-39226-direct-multi_table-update-delete
commit: 5992b3d00bec6bdaee4c7dcd3efd9bb8e39e4911
Version : 13.1.0

How to repeat:

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Slave:

create table s1( a int);

Master: Start server with federated engine enabled

create table s1(a int)  ENGINE="FEDERATED" CONNECTION='mysql://u3:pass1@127.0.0.1:3306/m8/s1';

insert into s1 values (1),(2),(3);

set global federated_pushdown=ON;

drop view if exists v1;

create view v1 as select * from s1;

UPDATE s1 JOIN v1 SET s1.a = 1 where v1.a <3; //Notice: Update succeeds i.e it isn't pushed down