Joins with derived table and aliases produces bad plan

[systay]

For a query that can be merged into a single route, if one of the tables is a derived tables, and it is aliasing a column that is used in
a join predicate, Vitess produces the wrong query.

For the query:

select 1 
from user 
  join (
     select id as uid 
     from user) as t 
where t.uid = user.id

vtgate is now producing the following route:

{
  "OperatorType": "Route",
  "Variant": "Scatter",
  "Keyspace": {
    "Name": "user",
    "Sharded": true
  },
  "FieldQuery": "select 1 from (select id as uid from `user` where 1 != 1) as t, `user` where 1 != 1",
  "Query": "select 1 from (select id as uid from `user` where id = :user_id) as t, `user` where t.uid = `user`.id",
  "Table": "`user`"
}

This is the only operator in the plan - there is not join feeding the :user_id argument, so the query fails to run.