distinct() breaks when chained with where() and join()

The following returns duplicates:
```typescript
q
  .from({ user: users })
  .where(({ user }) => user.active)
  .join({ post: posts }, ({ user, post }) => eq(user.name, post.user))
  .select(({ user }) => ({ name: user.name }))
  .distinct()
```

Minimal repro: [stackblitz.com/edit/tsdd](https://stackblitz.com/edit/tsdd?file=index.tsx)
