更改所有者对象时,Postgresql：错误“必须是关系的所有者”

更准确地说，联系表由userC拥有，并且当我执行以下查询以将所有者更改为与用户A连接的用户B时：

alter table contact owner to userB;

我得到这个错误：

ERROR:  must be owner of relation contact

但是userA具有正常的所有权限(“在架构上创建”授权选项应该是足够的)：

grant select,insert,update,delete on all tables in schema public to userA; 
grant select,usage,update on all sequences in schema public to userA;
grant execute on all functions in schema public to userA;
grant references,trigger on all tables in schema public to userA;
grant create on schema public to userA;
grant usage on schema public to userA;

THKS

命令行输出：

root@server:~# psql -U userA myDatabase
myDataBase=>dt contact
    List of relations
Schema |  Name   |   Type   |  Owner
-------+---------+----------+---------
public | contact | table    | userC
(1 row)
myDataBase=>
myDataBase=>alter table contact owner to userB;
ERROR:  must be owner of relation public.contact
myDataBase=>