from sqlalchemy import literal
from sqlalchemy import select
from sqlalchemy.orm import DeclarativeBase
from sqlalchemy.orm import Mapped
from sqlalchemy.orm import mapped_column


class Base(DeclarativeBase):
    pass


class Foo(Base):
    __tablename__ = "test"

    id: Mapped[int] = mapped_column(primary_key=True)
    val: Mapped[int]


inner = select(Foo.id).where(Foo.id.is_not(literal(None)))

assert inner._propagate_attrs
sq1 = inner.scalar_subquery()


assert sq1._propagate_attrs

stmt = select(sq1).where(Foo.val == 3)

assert stmt._propagate_attrs