Yeah, it is a touch scenario. I actually have much simpler cases:
1) select /*+ broadcast(t1) */ * from db.t1 join db.t2 on t1.id = t2.id; 2) select /*+ broadcast(t1) */ * from db.t1 a1 join db.t2 a2 on a1.id = a2.id; 2) is the same as 1) but with aliases. Many users were surprised that 2) stopped working. Thanks, John On Tue, Jun 11, 2019 at 4:38 PM Maryann Xue <maryann...@apache.org> wrote: > Yes, and for a good reason: the hint relation has exactly the same scope > with other elements of queries/sub-queries. > > Suppose there's a query like: > > select /*+ broadcast(s) */ from (select a, b from s) t join (select a, b > from t) s on t1.a = t2.b > > If we allowed the hint resolving to "cross" the scopes, we'd end up with a > really confusing spec. > > > Thanks, > Maryann > > On Tue, Jun 11, 2019 at 5:26 PM John Zhuge <jzh...@apache.org> wrote: > >> Hi Reynold and Maryann, >> >> ResolveHints javadoc indicates the traversal does not go past subquery >> alias. Is there any specific reason? >> >> Thanks, >> John Zhuge >> > -- John Zhuge
