Interpolating a query containing a where subquery into a join crashes the planner

[lukaszsamson]

Elixir version

any

Database and Version

any

Ecto Versions

3.14

Database Adapter and Versions (postgrex, myxql, etc)

any

Current behavior

Repro:

import Ecto.Query

sq =
  from s in "subposts",
    select: s.id

join_query =
  from p in "posts",
    where: p.id in subquery(sq)

query =
  from p in "parent_posts",
    join: p2 in ^join_query,
    on: true

Ecto.Query.Planner.plan(query, :all, Ecto.TestAdapter)

Result:

** (KeyError) key :subqueries not found in:

%Ecto.Query.QueryExpr{
  expr: {:in, ..., [{:subquery, 0}]},
  params: [subquery: 0],
  ...
}

Expected behavior

where expression should be folded into the join’s on expression and planned normally