【YashanDB 知识库】使用 leading hint 调整 SQL 执行计划后报错 YAS-04522 invalid hint leading

drop table a;
drop table b;
drop table c;
create table a(tid number,tname varchar2(30));
create table b(tid number,tname varchar2(30));
create table c(tid number,tname varchar2(30));
select /\*+ leading(c) \*/ distinct a.tid
from a
left join b
on a.tid = b.tid
left join c
on b.tid = c.tid
where a.tname is not null;